Results - April 24, 2020 FMT
|Actual Radio Frequencies (Hz):|
K5CM All (<=0.1 Hz):
AD5MT, DK4YJ, K0WM, KB3UMD, KD2BD, KI5EE, N7WS, N8OBJ, N9CIF, NJ0U, W3JST, W9INE, WA2IKL, WA5FRF
K5CM All (<=1.0 Hz):
AA6LK, AB4EJ, AB4RS, AC9LV, AD5MT, AD8Y, AF9A, AG6SV, AJ4YA, AJ5P, DK4YJ, K0WM, K3KSB, K4PPK, K5ND, K5RKS, K6FOD, K6OQK, K6UM, K9JM, KA1BQP, KA7OEI, KA8BRK, KB3UMD, KD2BD, KE5O, KF7NP, KG5X, KI5EE, KJ6HYC, KJ7E, KN1H, KQ6ZR, N0PFE, N1IRO, N3CRT, N3FG, N5KAE, N5NHJ, N7UTE, N7WS, N8OBJ, N8OOU, N8OQ, N9CIF, NA2SW, NJ0U, PE1FJN, VE2IQ, VE3GSO, VE3OAT, VE3YX, VE6CB, VE6GRT, VE6IXD, VE6KZ, W1JV, W1PJE, W2EMN, W2FD, W2TX, W3JST, W3JW, W4EDX, W4ENN, W4IVF, W4RYF, W4VU, W5EEG, W5LAC, W7SUA, W8TM, W8WTS, W9INE, W9ZB, WA2DVU, WA2IKL, WA5FRF, WA5UCW, WA7BNM, WA7X, WB2CMF, WB6HYD, WB6RJH, WB8TFV, WD4IYE, WQ8T, WW3S
K5CM 80 (<=1.0 Hz):
AA6LK, AB4EJ, AB4RS, AC5JM, AC9LV, AD5MT, AD8Y, AF9A, AG6SV, AJ4YA, AJ5P, DK4YJ, K0WM, K3KSB, K4FZU, K4PPK, K5ND, K5RKS, K6APW, K6FOD, K6OQK, K6UM, K9JM, KA1BQP, KA5QEP, KA7OEI, KA8BRK, KB3UMD, KD2BD, KD5FX, KE5O, KF7NP, KG0HY, KG5X, KI5EE, KJ6HYC, KJ7E, KN1H, KQ6ZR, N0PFE, N1IRO, N3CRT, N3FG, N5DM, N5KAE, N5NHJ, N6PE, N7EP, N7UTE, N7WS, N8OBJ, N8OOU, N8OQ, N8TW, N9CIF, NA2SW, NF7R, NJ0U, NS3DX, PE1FJN, VE2IQ, VE3GSO, VE3OAT, VE3YX, VE6CB, VE6CCM, VE6GRT, VE6IXD, VE6KZ, W1JV, W1PJE, W2EMN, W2FD, W2TX, W3JST, W3JW, W4EDX, W4ENN, W4IVF, W4RYF, W4VU, W5EEG, W5LAC, W5ZBT, W7SUA, W8TM, W8WTS, W9INE, W9ZB, WA2DVU, WA2IKL, WA5FRF, WA5UCW, WA7BNM, WA7IRW, WA7X, WB0LXZ, WB2CMF, WB6HYD, WB6RJH, WB8TFV, WD4IYE, WQ8T, WW3S
K5CM 80 (>1 to <=5 Hz):
KB7IJ, N0AN, N1HAC, N2GL, W4WJ
K5CM 80 (>5 to <=10 Hz):
K5CM 40 (<=1.0 Hz):
AA6LK, AB4EJ, AB4RS, AC9LV, AD5MT, AD8Y, AF9A, AG6SV, AJ4YA, AJ5P, DK4YJ, K0WM, K3KSB, K4PPK, K5ND, K5RKS, K6FOD, K6OQK, K6UM, K7HIL, K8WXQ, K9JM, KA1BQP, KA7OEI, KA8BRK, KB3UMD, KD2BD, KD5MMM, KD8CGH, KE5O, KF7NP, KG5X, KI5EE, KJ6HYC, KJ7E, KK4KAZ, KN1H, KQ6ZR, N0PFE, N1IRO, N3CRT, N3FG, N5KAE, N5NHJ, N7UTE, N7WS, N8OBJ, N8OOU, N8OQ, N9CIF, NA2SW, NJ0U, PA0PJE, PE1FJN, VE2IQ, VE3GSO, VE3OAT, VE3YX, VE6CB, VE6GRT, VE6IXD, VE6KZ, VE9DAN, W1JV, W1KU, W1PJE, W2EMN, W2FD, W2TX, W3FAY, W3JST, W3JW, W4EDX, W4ENN, W4IVF, W4RYF, W4VU, W4WJ, W5EEG, W5LAC, W7SUA, W8TM, W8WTS, W9GR, W9INE, W9ZB, WA2DVU, WA2IKL, WA4FJC, WA5FRF, WA5UCW, WA7BNM, WA7X, WB2CMF, WB6HYD, WB6RJH, WB8TFV, WD4IYE, WQ8T, WW3S
K5CM 40 (>1 to <=5 Hz):
AC6SL, K6APW, KA5QEP, KB4BLU, KD5FX, N0AN, N2GL, N5DM, NF7R, NN5G, VE6CCM, W5ZBT
K5CM 40 (>5 to <=10 Hz):
|Method: HP Z3805A 10MHz GPSDO, Marconi 2019 HF synth, HP 3325A LF synth, HP 54601A o'scope, FT-847 in AM/narrow mode, 5BTV antenna, Win10 laptop running SpecLab, Digipan for spotting, EZGPIB driving USB-serial and Prologix USB-GPIB to control and interrogate the instruments and radio, GPSCon for monitoring Z3805A; the 2019 was set to inject a reference beat signal to produce a ~400Hz beat tone, and the 3325A was manually tuned for minimum phase slip between it and the beat tone as seen on o'scope. Each run was also recorded to a .wav file through SpecLab, and at a later time replayed to export data to spreadsheet to refine submission numbers.|
Soapbox: Thanks Connie for running the event. 40m signal was strong with much amplitude and phase variation, and the 80m signal was weak but more stable; still had to guess at the submission numbers.
|Method: FlexRadio 6600; homebrew GPSDO-signal generator (WB0OEW design); Spectrum Lab|
Soapbox: Some frustration this year with equipment malfunctions; hope I got close anyway
|Method: Received using HP3586B locked to Trimble Thunderbolt, sampled audio IF using computer sound card. Calibrated sound card sample rate using HP3336B. also locked to Trimble Thunderbolt. Did audio analysis using SpectrumLab.|
Soapbox: Good signals into Northern Virginia, 40m was received at -72 dBm, 80m at -83 dBm. 80m signal was very stable, 80m signal appeared to split, with the strongest portion taking about a 1 Hz deviation, but the weaker portion appeared to be stable and constant, so that's the value I chose. Fun as always.
|Method: Hewlett Packard HP3586B Selective Level Meter|
Soapbox: I botched the 40 meter reading but entered what I had anyway. I was listening for you on USB and couldn't find you. Oh well.
|Method: Elecraft K3, frequency calibration data from wsjtx.|
Soapbox: I could not hear the 80m signal.
|Method: TS590S,for the front end, tapped, feeding a calibrated SDR Play RSP 2.|
I calibrated the RSP from 10mhz WWV. Previously built the WWV TRF receivers from QST Feb. 2018 article, which ensured strong signal from WWV. Scrolled the RSP to the on-air transmission to match freqs.
Soapbox: Not a contester here, but this is my contest entry. Thanks Connie for providing a challenge . Fortunately, band(s) conditions were good.
All shack equipment was warmed up for three days. Motorola R1200S Service Monitor was calibrated as well, for a ballpark estimate frequency....
|Method: WSJT, GPSDO into TS-890, dipole antenna. Compared received signals to WWV for fine tuning.|
Soapbox: It still feels a little like a guessing game
|Method: Kenwood TS-450, Jackson Labs GPSDO installed in the transceiver. Fldigi analysis mode running a Linux Mint laptop. Rigblaster Advantage, calibrated against CHU and WWV. Wire antenna into the attic.|
Soapbox: The Case Amateur Radio Club of Case Western Reserve University, W8EDU, has its members and equipment distributed far and wide for the pandemic. Along with HamSCI, we all are trying this FMT, which we would normally do as a club and School of Engineering event. We'll see how various members do. Thanks as always for running the show, Connie.
|Method: OpenHPSDR Mercury receiver, external 10 MHz OCXO, measurement with WSJT-X FreqCal.|
Soapbox: Big signals as usual! Thanks Connie
|Method: 2 receivers iCom & SDR, both followed by large FFT|
Soapbox: 2 receivers disagreed on 40m tone, couldn't determine why after tests
|Method: Used a K3s and zero-beat the signal with SPOT function. Corrected for error in VFO and guessed (estimated) at other errors. Called it good.|
Soapbox: I look foward to this every 6 months, but this April was especially sweet due to the CF we find ourselves in right now. I hope everyone had as much fun as I did.
|Method: IC-7300 and FL-DIGI|
Soapbox: Lots of QRN in the southeast tonight, hard to calibrate with WWV. K5CM was strong.
|Method: RX: Perseus SDR, Dipole 2x17m @ 13m. Added a marker signal to the RX (3597 kHz / 7063 kHz) from a HP3325b locked to a GPSDO. Used a small python script to process the raw IQ data. Extracted phase vs. time of the unknown signal and subtracted the phase of the reference signal. Evaluated the slope of the resulting phase for the parts of the reception with the best SNR. No idea if this works as expected.|
Soapbox: Mni tnx Connie! My first FMT. The hardest part was to get out of bed at 03:30 local. I live in the city, so there´s quite some man made noise, but the 40m signal was well received at around -100 dBm peak, going up and down 40 dB with the QSB. 80m was tough with the signal peaking at around -120 dBm. Let´s see if my method produced results close to reality... 73, Matthias, DK4YJ
|Method: Set up is mostly old school; I stick with it because it’s paid for. Equipment is a Yaesu FT-1000MP Mark V transceiver (CW mode, narrow CW filters and audio DSP with 60-Hz bandwidth), Rockwell/Collins 180S-1 tuner, 40-meter dipole, Fluke 8845A multimeter as an audio frequency meter. Calibrated the receiver with a Bodnar GPSDO. Recorded CW audio frequency; removed fades and frequency outliers. Did a two-minute run on WWV 5 MHz after the 80-meter transmission to check conditions and analyses.|
Soapbox: Strong signals on 40 meters and WWV. Significant QSB on the 80-meters. Thanks to Connie K5CM for his continued support of this interesting event.
Soapbox: Fldigi was easier than the old WSPR suite that I've used in the past but I needed to practice with it I think.
|Method: IC-7300, WSJT-X Freq Cal mode, GPSDO, HP3336, WWV. Used WWV and gps locked HP3336 to get correction factors on WSJT-X. Averaged readings to account for doppler shift. I hope I applied the correction factors in the right direction.|
Soapbox: Thanks for doing this. Strong signals on both bands, no fading, but there was doppler shift.
|Method: My ICOM IC-7000 - Calibrating with WWV...|
- Finding: Dial reading tests 4 cps high using precedure below
- Use LSB mode
- Find the desired signal (should be >6dB out of the noise)
- Tune to the nearest higher 1 KHz mark
to produce an off-frequency beat note within
the LSB bandpass of the Rx
- Note and measure the off-frequency CW tone
- Test #1 was 996 cps using cell phone with Spectroid app w/resolution = 1 cps
- Test #2 was 996.32 (avg of .73 to .07) w/resolution - .01 cps
This gives a "system" correction factor (2x comparisons favorable)
#1 of 4.00 cycles
#2 of 3.68 cycles
- Add tone frequency plus the correction factor to get true beat note
- Subtract true beat note from dial reading to resolve signal frequency
Soapbox: 1st time...
|Method: Calibrated my Icom 7300 using WWV at 5.000 MHz and used FLDIGI to make my measurement during the event.|
Soapbox: Thanks for a fun event again. The signal here in the Tampa area was good on both bands.
|Method: IC-9100 with vertical antenna. WSJT-X Frequency Calibration mode with calibration conducted one hour prior to the test. Averaged measures from key down to key up.|
Soapbox: Very solid signal on 80 meters with 40 meters much lower but easily readable. Thanks for the time and effort to put on this test.
|Method: Injected signal from HP3336B Frequency Generator into coax coming from receive antenna using T connector. HP3336B used external 10Mhz GPSDO reference signal. Homebrew software with FFT determined frequency of K5CM signal and injected signal. Bin size of FFT is 0.122 Hz.|
Soapbox: Both 40m and 80m signals were stable in strength at about S5. 40m signal had significant Doppler -- about 0.6 Hz overall variation across 12 separate 8 second measurements. Apparent Doppler on 80m was about 0.25 Hz. I averaged the 12 measurements for each band to get reported frequency.
|Method: ICOM IC-7300 centered sidebands on spectrum scope center|
Soapbox: Misplaced my audio hybrid combiner, so did a makeshift measurement. Forty meter signal good at S7, eighty meters very noisy with S3 signal. Not yet sunset here, unstable path.
|Method: HP3586B receiver and HP3336B signal generator, both receiving external reference from Trimble Thunderbolt GPSDO, with 3586B's I.F. and 3336B's output displayed on axes of Tektronix T922 oscilloscope. Followed methodology of Burt Weiner K6OQK.|
Soapbox: 80m was much more difficult due to noise. Overall enjoyed the event a great deal.
|Method: I use an HP-3586B receiver and a HP-3336A Signal Generator, both referenced to GPS. The 15.625 kHz I.F. of the HP-3586B is fed to one side of an oscilloscope and the other side of the oscilloscope is fed by the HP-3336A. The HP-3336A is adjusted to produce as stationary a 1:1 Lissajou pattern on the scope as propagation will allow. For details of my method see: http://www.k5cm.com/k6oqk%20fmt%20new.htm|
Soapbox: 40-Meters was pretty good at my location, with not to much fading, but with some Doppler shift. Connie's 80-Meter signal was pretty weak so it took me longer than normal to home in on it. Once I did I was able to go to the 20 Hz wide filter and home in on it.
Thanks to Connie and Mike for FMT his work in making the FMT's such a greatevent, and for Pam for allowing him to escape to the Ham Shack. :> _Burt, K6OQK
|Method: Elecraft K3|
Homebrew GPS derived 10MHz timebase
WSJT-X 2.1.2 in FreqCal mode
Soapbox: First time using WSJT-X in FreqCal mode.
Next time I should have my DDS frequency source working so I can attempt to remove the doppler shift on the signal and K3 frequency changes due to its frequency locked reference.
|Method: Two methods with two sessions of Spectrum Labs running. 1) Used calibrated CW Pitch on Icom and 2) Beat HP3325 aginst CW signal with Flex on AM. Receiver and radios on separate / isolated GPS time source.|
Soapbox: Only 40m signal heard at all. Nothing on 80m. The graphing of the CW pitch and the beat frequency using AM directly over laid each other.
Entered all this info on the K5CM entry page, not sure which of these pages is correct.
|Method: IC-7610, FLDigi, Xonar DG sound card|
Soapbox: Murphy appeared. Could not come back from computer crash in time to salvage any of the 40M run. Both *)m & 40M signals were very good, clear & steady.
|Method: FT-991A Looking for zero-beat, guessing|
|Method: ICOM IC-756PROIII CW Mode BW=50Hz 80M Dipole|
Calibrated to 10MHz WWV
Autek QF-1A Audio Filter adjusted to 600Hz
Soapbox: It was fun 73's Al K8WXQ
|Method: K3s calibrated and tuning forks|
Soapbox: The more significant figures you enter, the more people think you know what you are doing. I go for low tech solutions.
|Method: WJ-8718A receiver locked to Rb standard. Spectrum Lab software to measure beat note.|
Soapbox: Strong signals on 40m. Somewhat less on 80m with significant QSB. Lots of doppler this evening. Thanks Connie for another great FMT! Hope you and Pam are staying well. 73
|Method: Harris RF-590 clocked with quartz frequency standard. Audio was recorded and analyzed with Mathematica software.|
Soapbox: Good signals on both 40 and 80 meters.
|Method: Elecraft K3 - Dipole antenna / Zero Beat Method|
Soapbox: Second Attempt hopefully experience helped. Friend was 3597980
|Method: HP Z-3801 GPSDO feeding a Schulumberger 4031 communications test set: RX is Yaesu FT-817. RX tuned to provide approx. 1.6 kHz tone from K5CM with local generator lightly coupled to antenna at nearby frequency. Both audio tones measured using Spectran and Spectrum Lab to calculate off-air frequency - did math several times from both programs' data.|
Soapbox: Signals on both bands very good - very little Doppler noted on 40 meters. Wasn't paying enough attention to schedule and tuned in (with recording running) to catch sign-off on 80, so I just did the best I could with just 10 seconds of CW on that band, hoping that K5CM's TX is phase coherent between CW elements.
|Method: Icom706MKII 80 Meter Droopy Dipole|
WSJT-X Freq Cal mode and some 'Kentucky' windage.
Soapbox: Very strong signal on 40, some QSB on 80.
Thanks to all who help in any way to conduct the FMT.
|Method: Yaesu FT-817ND, fldigi in ANALYSIS, PC operating system elementary OS 5.1.3.|
Soapbox: Trying something new for this installment of the FMT. Hopefully, I am closer than last fall...which was the best I had ever done. If not, I still had fun with the set up and acquisition of the signal...as well as chatting with N3CRT online while doing so.
73 from Buffalo...stay healthy/stay safe/stay home.
|Method: Kenwood TS-590SG with SO-3 TCXO, inverted L antenna, WSPR 2.12 fmt command line utilities. Calibration run before and after the 2 measurements. 40 m was quiet, 80 m was noisy with static crashes, nearby SSB, and QRM during the test.|
Soapbox: Another enjoyable FMT here in FN20! Thanks to KA2VLP for providing notes from last year (and equipment). I look forward to hearing if the others from W8EDU heard anything interesting ionospherically during the test. I thought I heard a change in pitch during our measurements on 40 m.
|Method: Kenwood 590SG & SDR RSP1A|
Used 590 to zerobeat and read the freq off of the RSP1A as the 590 only measured down to 10 hz
|Method: AirSpy HF+ thru SDR Console v3.x, WSJT-X 2.1.2 in freqcal mode|
|Method: Yaesu FT-991A and ears.|
Soapbox: Have a nice day :)
Wear a mask.
|Method: All homebrew equipment including a carrier phase tracking receiver, a WWVB referenced frequency standard, and a frequency counter. Method involved phase locking the receiver's LO to the frequency of the unknown carrier minus a 1 kHz offset, measuring the frequency of the receiver's LO over several 10 second integration periods, and taking a "selective average" of the readings after factoring in the 1 kHz offset. Details available at: http://www.qsl.net/kd2bd/fmt-methodology.html|
Soapbox: The Kp-index dropped from 3 to 1 around the time of the FMT resulting in stable propagation conditions. A few mishaps during the 40-meter run limited the number of measurements to only 2. On 80, Connie's signal experienced a number of deep and shallow fades. Thanks to Connie and the ARRL for supporting the FMT!
73.000 de John, KD2BD
|Method: FLEX6300 with Spectrum Lab. Calibrated to WWV & CHU. S5 to S9 signal on 40 mtrs, +10 to +30 signal on 80 mtrs.|
Soapbox: Bands were in great shape, glad there wasn't the t'storms we had last night in OKla!
|Method: FT847, signalink, SpecLab, CHU, Excel.|
Soapbox: Very good sigs from K5CM on both bands tonight!
|Method: Elecraft K3 in CW mode|
tune for peak at side tone set frequency
Soapbox: First time
|Method: Yaesu FTdx1200 with a wire antenna. No external frequency standard, radio had already been on for several days performing doppler measurement. Tuned to prescribed frequency in fldigi and recorded estimates with frequency analysis mode, then averaged. Not a very precise approach, but at least I'm here.|
Soapbox: First time doing FMT outside the auspices of W8EDU; cheers to AD8Y for nudging me to participate. Very fun event, thanks for putting this on.
|Method: Receiver is HP 3586A in direct count mode sync'd to a True Time XL-DC GPS receiver. 80m dipole and 40m inverted V.|
Soapbox: Plenty of thunderstorm static with good sigs on 40 and fair amount QSB on 80. Good fun!
|Method: Technique: Warmed up my radio beforehand, and then measured frequency offset of the dial using WWV 5/10/15 MHz (+1.3298 ppm). Then, tuned a few hundred Hz below the signal and piped audio into Audacity. Then resampled, filtered, and ran an FFT.|
|Method: Vertical,Kenwood TS-2000, WSJT-X, WWV|
|Method: I use an SDRPlay RSP2 SDR. The external reference input is driven by a 24 MHz signal from a home brew GPSDO. I use SDR Concole software version 3.01 to control the SDR. Later versions of the software introduce a .488 Hz tuning error. The audio output is sent to a Virtual Audio Cable that drives the audio input to WSJT-X version 2.0 running in the frequency calibration mode. Since the signal is digitized only once using the reference clock from the GPSDO there are no additional sampling errors.|
Soapbox: Thanks for another great FMT. The was a lot of doppler on the 40 meter signal because the event occurred at our local sunset. It included a 15 second period with a steady +300 Millihertz shift followed by a 15 second -300 Millihertz shift. I assume this was caused by a reflection off possibly an aircraft. The 80 meter signal had much less doppler.
|Method: Power up 0000Z, set receiver to CHU on 7.850 kHz. Used two SWL dipoles, that were setup for space diversity, with selective phase. Receiver is Winradio G313.|
Soapbox: Signals good, both bands holding -80 dBm. NO QRM or QRN!
|Method: RSPDUO and CHA250 vertical ant.|
Soapbox: Very strong signals at this QTH. Thanks Connie.
|Method: I used my Kenwood TS-2000 and Spec Lab.|
Soapbox: The radio was turned on about 45 minutes before the test was to start. I checked the frequency calibration of the radio using WWV as a reference source. I plotted the radio frequency deviation on a graph using an Excel program. My radio was 0.9 Hz off on the 80 meter test frequency and 4 Hz off on the 40 meter test frequency. The doppler effect was not to sever. The QRN was very bad from lightning out in the Gulf of Mexico.
|Method: GPSDO as a 10Mhz time base into Icom IC-7610 receiver and HP 5334A Freq Counter. Set IC 7610 for max. resolution, took readings and then transmitted into a 100W dummy load/attenuator connected to the HP 5334A. The 1/10 cycle of the frequency entered is a estimate from my visual observations, as it is very difficult on the IC-7610 to resolve better that 1 cycle.|
|Method: FTDX101 for demod, HP53132A counter, HP8920A generator, Bg7TBL GPSDO reference|
Soapbox: I was able to make really nice averaged measurements on 40m, but my data recording system (iPhone camera) didn't capture the VFD display on the counter :( Luckily I still had a few short measurements I was alb to fall back on. I didn't make the same mistake on 80m and was able to average over 90 seconds of measurement.
|Method: IC7300, G5RV Inverted Dipole, measure by signal strength|
|Method: Frequency measurement between two known markers|
Soapbox: Couldn't get a definite 80m.
|Method: IC-7300 with VE3DO loop antenna and Spectrum Lab on HP workstation.|
Soapbox: Missed the last 2 FMTs and was glad to be stuck at home to be able to make this one. K5CM 599 on both bands here in NH, no QRM. Great job!
|Method: IC 7300 and used its' narrowest scope setting|
Soapbox: 40 meters was easier to copy. 80 meters had a lot of lightening noise from the storm north of the QTH and made tuning very difficult
|Method: Yaesu FT-991A / SML-1000-1 "Ghost" Edition Loop|
Soapbox: Have a nice day, :^)
Wash your hands.
|Method: HP 3586C, frequency locked to a Jackson Labs Fury GPSDO, IF pickoff to Spectrum Labs. A reference frequency for Spectrum Labs sample rate lock was provided by an Agilent 33220A also frequency locked to the GPSDO.|
|Method: AirSpy HF+ SDR Dongle (SDR Console v3.x), WSJT-X FreqCal|
Direct Measure and Average DF
|Method: Elecraft K3, P3 panadapter, spectrum Lab. Stabilized rig for several hours beforehand; Zero beat to WWV noting 600Hz on Spectrum Lab; tuned to K5CM and bot zero beat and verify frequency center at 600Hz on Spectrum lab. I don't have a good way of getting granularity better than 1 Hz.|
Soapbox: I always enjoy these events. Last nights signals from K5CM were strong on both bands with only slight fading. Static crashes were very noticeable on 80m but 40m seemed fairly calm.
|Method: Calibrated Yaesu FT-990 in CW mode compared to 600 Hz reference tone.|
|Method: Kenwood TS-2000 clocked by GPSDO in CW mode. Spectrum lab on Computer.|
Soapbox: Pretty significant doppler wobble this time made it more challenging. Thanks so much for doing this! I wish we could do it more often! See you in November!
|Method: HP3586A Locked to HP Z3816AGPS reference|
Soapbox: Thanks Connie.
|Method: Flex 6400 / FLDigi / WWV 15MHz|
Soapbox: Great signals on both bands into NNJ. Thank you! Lot's of fun as always.
|Method: K3, Spectran, WWV, CHU|
Soapbox: Lots of doppler and noise here. TNX again to K5CM for another first class event.
|Method: Ft-3000, Digipan v.2, dipoles.|
Soapbox: 40m solid signal/tone, 80m QSB/QRN. Thanks Connie.
|Method: IC-746pro transceiver. SignaLink USB sound card, WSJT-X software, calibrated to WWV at 5, 10, and 15 MHz 20 minutes before test. 40 and 80M inverted vee antennas. Used published "Near" frequencies as the center set points. Ftol set at 1000 Hz. Took averages over last 16 measurements, and added (or subtracted) the delta frequency from set points.|
Soapbox: This is the first time using any software, and it was a steep learning curve for using WSJT-X to measure unknown carrier frequencies. Strong sigs on both bands, so no trouble there. Either I did pretty well, or I generated VERY ROTTEN results!! Thanks for another great test K5CM!!
|Method: Flex 6400 + WSJT-X|
|Method: Icom IC-746Pro, OCF dipole at 40 feet. I did it the old-fashioned way. Just used my ears to zero-beat the signal.|
Soapbox: Excellent strong signals into Oklahoma City. Thanks very much.
73 Jim N5OHL
|Method: WSPR ICOM PRO III|
Soapbox: Set up 40M batch to 300 secs. Wouldn't fly, by the time I cut it to 120 sec. all I got was some CW hit, no key down. 40 batch was better hi hi
|Method: IC-7300, WWV and Speclab software. Now if I could just learn math.|
Soapbox: Very strong signals with little doppler shift. Thanks K5CM
|Method: Used Spectran software connected with SignaLink to IC-7000 radio to capture signal and record as wav file. Repeated process with GPS locked signal generator at 10 hz bellow and 10 hz above measured FMT signal. Calculated radio calibration using signal generator measurements.|
Soapbox: 40 meter signal came in strong +20 with little QSV.
80 meter signal was barely above the noise floor and saw frequency shift during measurements.
|Method: (2X) SDR-IQ, Reference signal from DG8SAQ VNWA in Sig Gen mode w/Bodnar GPSDO reference. Beat note recorded as audio on one RX, RF recorded on other and demodulated post test. Analysis with SpectrumLab using integrated sound card in HP desktop.|
Soapbox: My second try at this. Less comfortable with these results than previous ones. Lots of QSB, particularly on 80 meters >25 dB made analysis difficult. Used eyeball averaging and hoped for the best. Nevertheless, lots of fun---thank you Connie.
|Method: FLEX-6500, Gap Titan, Leo Bodnar mini GPSDO, Using Fldigi-4.1.12 (with my mods!), tuned down 1KHz, USB, Freq Analysis module, selective "picking of data"|
Soapbox: 40M was pretty stable. Rainstorm here during FMT - 80M fading and Ionospheric doppler shift were all over the place. Pretty much an educated SWAG for 80M. Not a good FMT night for us here in NE Ohio.
Was nice to be able to stop and restart Fldigi Analysis package and not loose any data.
|Method: KiwiSDR-GPS disciplined, ARGO, along with FLDIGI 22.214.171.124 as a test.|
Soapbox: Good signals on both bands.
|Method: KX3 #5880 + Bodnar GPSDO + WXJT-X + Excel + 52ft end-fed ant. inside house. GPSDO carrier in bandpass, standard math to determine display bias and then correction applied to K5CM carrier.|
Soapbox: Used WSJT-X rather than Spectrum Lab for measurements this time. Signals ok but 80m was rather weak with this antenna. Estimation of errors in K5CM signal give +/-0.09-Hz on 80m and +/-0.16-Hz on 40m.
|Method: Reference Offset. GPSDO, FT-980, PC, Fluke 6070A.|
Soapbox: Computer issues with 40M.
|Method: IC-7200 aligned to WWV, WSJT-X|
Soapbox: Good signals. Thank you!
|Method: Used IC-731 to tune to nearest Hz. Then fed audio to FLDIGI, and put carrier on 1500Hz audio. Then did frequency analysis feature of FLDIGI. Then averaged the last 16 freq cells on the analysis.csv file for 40M. And averaged the last 11 cells for the 80M freq. I just manually averaged them cuz I was too rusty on the cell maths on the grid file...next time I can do them all...hi hi.|
Soapbox: First time for the FMT. Been in Hobby since 1966, and have worked as a professional radio operator/technician for almost as many years...but first time I got up the oomph to submit an entry. I guess if it's not close I won't be too devestated...because it was fun...73, NF7R
|Method: IC-7610, Bodnar mini gps, FLdigi|
Soapbox: using CHU and WWV as reference sources
|Method: Antenna's 2x20mtr dipole-450 ohm feeder-balanced tuner+ pa0rdt_MiniWhip - IC7610 2 rx's in diversity mode locked to 10 MHz Rb standard.|
Soapbox: Both frequencies clear but very weak sigs with relatively little QSB. I averaged the numbers using wsjt-x no QRM during transmissions. Thanks for the efford, it was a pleasure to wake up early this morning - 73, Peter
|Method: RIG: SunSDR2 QRP, Antenna Hyendfedd 40m/20m/10m used for 80m RX|
Method: Adjusted clock correction setting SunSDR2 using RWM time signal 9,996,000Hz during last week to get as close to 0Hz error, during sunset time. Kept SunSDR2 powered >24h, stable T ~44C.
Decided NOT to use RWM signal during sun-rise this morning, I observed ~0.5Hz suspected doppler around FMT transmission time and decided to trust my SDR stability.
https://www.febo.com/pages/hf_stability/ gave me some confidence that I can trust my ref clk stability better than RWM during sun rise.
Used Spectrum lab plotter to get frequency measured, and FFT at max amount of points.
Soapbox: Good Day from The Netherlands:
40m K5CM good Signal in The Netherlands, 559 QSB
80m K5CM also good Signal on my 40m small antenna, 529 QSB
Hope this time my "guess" is better,,
Also I was live with catching the signals, took day of not to go to work in the next hours, hi.
73 and all the best,
|Method: E-probe > TS850 > soundcard in Laptop (external freq std > TS850). Calibrate std over 24h with GPS. Tune incoming CW by ear for approx 800 Hz output using sidetone. Write down dial setting! Measure audio output freq, adjust for known offsets. Think for a long time about Doppler corrections, decide against it. Submit readings.|
Soapbox: Nice to have a diversion during virus lockdown. Thanks Connie. FB signals as usual. Alas, no sporadic E this time.
|Method: IC-7610 and Spectrum Lab. Tuned down to nearest 500Hz and added audio tone measured with Spectrum Lab.|
Soapbox: 40m signals 59+12dB with S7 lightning static reaching +20dB
80m signal S9 but heavy splatter from local QSO at 3600 USB
|Method: The old AM-mode-beat-the-signal-with-a-reference-measure-the-tone method, with reference signal derived from GPS disciplined oscillator.|
Soapbox: Good signal levels on both bands and surprisingly stable propagation (well, so it seemed anyway HI). Only some QRM on 80m from a local sideband net.
|Method: Drifty TS-870 with 2 instances of Fldigi, one on the FMT signal and one on a GPSDO stabilized signal generator set to ~ 150 Hz above the FMT signal, capacitively coupled into the antenna. Both instances of Fldigi were set to the same freq. The sig gen data gave the error for the FMT readings.|
Soapbox: The 40 m signal was very good, but the 80 m signal was weak and there was nearby strong SSB.
1st time using this method -- will see how it worked out!
Thanks again Connie.
|Method: Zero beat signal generator: Rigol DSG815|
Soapbox: Fast signal flutter made it difficult to be sure the lowest beat was obtained. K5CM very strong on both 40 and 80m
|Method: Zero beat on Icom 7300|
|Method: SDRPlay RSP-2 and SDRUno software, running 4 virtual receivers, to simultaneously record 3 WWV channels while chasing K5CM. Audio signals were fed through homebrew frequency analysis software.|
Soapbox: The transmission path from K5CM to Calgary is essentially the same as the path from Ft. Collins. This will be my first attempt to include Doppler shift corrections based on the simultaneous WWV signals. Lots of fun, and what else can you do when the kids have you locked down! Thanks to XYL Jenny, who rode shotgun on the process, running 4 receivers at once can get confusing. And Thank You again K5CM.
|Method: Flex 5000A controlled by WSJT-X, all running on a computer under Windows 10.|
Antenna for 40m, inverted-V dipole. For 80m tuned-loop oriented for 20dB reduction in noise in this urban back-garden.
Soapbox: My third entry in the FMT. Thank you very much for organizing the test. The loop antenna seems to have solved my problem last year of very high noise level on 80m.
|Method: HP3586B selective level receiver in LSB with: 75 ohms, Carrier, 20 Hz B/W, 1Hz step and 'set level'. G5RV antenna through tuner for 75 ohms. FE5608A Rhubid freq reference to HP3586B and HP3582 spectrum analyzer. Used a "zero" of 1850.066Hz tone when RF input from FE5608B at 10MHz with HP8316A counter from HP3586B.|
Soapbox: The 40M run was with good levels and noise. The 80M run was good for about 45 seconds and then multiple doppler signals were seen at lower frequencies up to 0.6 Hz. WWV at 10 MHz and 5 MHz had dopplers at near 1 Hz lower doppler frequencies just following the test where they are normally only 0.3 Hz maximum midday. The HP3582 spectrum analyzer at 0.5Hz per division and 20 millihertz B/W clearly shows the dopplers to 0.02Hz resolution. 0.01 Hz resolution can be obtained using levels from the 0.02 Hz readings. Thanks to Connie K5CM for the experience.
|Method: SDRplay RSP-1 and RSP Spectrum Analyzer software.|
Checked frequency readout against 40M CHU and 80M CHU.
Soapbox: I love this stuff. I am not good at it yet, but I love it.
|Method: thunderbolt, 3586C, kiwisdr as a tuning aid.|
|Method: E-MU 0204 soundcard and RS-HFIQ SDR with Fox924 TCXO for LO. Spectrum lab. Radio sampling and soundcard LO calibrated against local PPS & 10MHz Thunderbolt day of test. 192 KHz sampling rate. Over-the-air offsets calculated from WWV5000 and WWV10000 and interpolated linearly.|
Soapbox: Good signals on both bands. Thanks again for running the FMT.
|Method: 80/40/20 fan dipole + NetSDR + Connor-Winfield GPSDO + custom Gnuradio stack + Digital RF (https://github.com/MITHaystack/digital_rf) + Python/Numpy/Scipy custom scripts + Freq estimator from "fldigi". Independent collection from W1NJC's KiwiSDR in Sutton, MA.|
Soapbox: Local collection at this QTH was solid on both carriers. KiwiSDR did not pick up 80m run but got good results on 40m. WWV estimator check helps. Doppler on 40m was very stable but 80m had maybe 0.1Hz of slope - still tricky. (Using a KiwiSDR near K5CM seems a bit unfair, so I didn't do it.) It remains the case that I/Q recording and ability to refine analysis are key. Hopefully the answers are somewhere within the ballpark. Thanks once again to K5CM. 73s to all.
|Method: ICOM 7610 with Rigol scope to measure beat note. Averaged data by taking photos of scope screen and manual calculation. Software would be easier but computer died.|
Soapbox: Good signals on both bands. 7610 is a great receiver for this application with digital IF and audio filters, as well as a reference input from a Rb standard.
|Method: ICOM 7100 CW/CW-R 50 Hz. BW with 1 Hz. dial frequency resolution. Use ~ 600 Hz. audio from an audio generator to synch a scope display of the receiver ~ 600 Hz. audio output A frequency counter was used to measure the audio generator frequency and refine the frequency resolution to approximately 0.1 Hz. Calibration was made from WWV 15 MHz. after the FMT.|
Soapbox: Thanks to Connie and Bruce and the ARRL Staff involved with this FMT. Lots of QRN, occasional QRM and particularly wide and rapidly varying phase of the transmitted signals. The signals were strong but it was difficult to get a good measurement of frequency, particularly on 40 meters.
|Method: Two stations, each logs time-stamped frequency data. One is a modified KWM-380 and the other is a modified RF-590. Both use outboard soundcards feeding Spectrum Lab SW. All oscillators are locked to the lab standard. Antenna is an untuned 43 ft. vertical. Data is recorded, plotted, compared, and squinted at for quite some time.|
Soapbox: 40M signal level was about 200 uV with up to 30 dB fading. 80M signal was about 20 uV with 10-15 dB fading. Lots of lightning crashes! Doppler spread on 40M was 0.4 Hz.
|Method: Elecraft K3 w/TCXO option; 30 Ft. vertical; Spectran audio analysis software. Prior to test, established freq error correction factor against WWV (5-15MHz) where Spectran measured the same 600Hz sidetone while toggling between CW and CW-R. During test, recorded K3 frequency where I measured the same 600Hz sidetone in Spectran (as in WWV) while alternating between CW and CW-R modes. Applied correction factor to recorded frequency for submission.|
Soapbox: 40M test signal was very strong but I wasn't able to copy 80M. Fun event as always.
|Method: IC-7610, bodnar mini gps fldigi|
Soapbox: used raw data from WW3S collection, but applied 1/4 Sigma to remove outliers.
|Method: Icom 7610 (GPSDO reference) into Spectrum Lab|
Soapbox: Signals were about average with plenty of multipath. the 80M signal was S9+5dB and the 40M signal was S9+15 dB. TNX to Connie and all who make the tests possible---73
|Method: ICOM-7610, Spectrum Lab, HP computer|
Soapbox: Excessive QSB on 80 meters but signal 569. 40 Meters about the same conditions.
|Method: Kenwood ts2000x, Bodnar GPSDO Spectrum Lab. Established correction factor, measured and applied correction.|
Soapbox: Thanks Connie and all involved in FMT. Horrible doppler on 80 meters and lots of lightning noises. Good luck all 73, Mack W4ENN
|Method: GPS-locked reference compared to unknown with Spectrum Lab software.|
Soapbox: Thanks to Connie and all for the test.
|Method: Equipment: Icom-7610, 300ft horiz loop ant, Signal Link sound card, Dell laptop running WixW in BPSK mode. |
Method: Calibrated radio BFO and waterfall display against CHU and WWV standards. Set radio to test frequencies in narrow CW, subtracted calibrated BFO freq from the audio offset freq observed on the MixW waterfall display, then subtracted that result from the published test frequency.
Soapbox: Once again, thank you ARRL and especially K5CM for sponsoring this test. You had a good solid signal into western North Carolina./73 de w4ryf
|Method: HP3586B with eBay Trimble Navigation 10 MHz oscillator calibrated to WWV on 5 MHz. Antenna 70 ft terminated travelling-wave (WA2WVL design) at 20 ft height. Took about 25 observations during transmission and visually took median values.|
Soapbox: Thanks for great run! K5CM -65 dBm on 80M and -79 dBm on 40M into North Carolina.
|Method: My Racal 6790/GM is on the bench, so, used my K3 with the 0.5ppm time base. Using the spot feature, made checks against 3.380, 5, 7,850 and 10MHz CHU and WWV to see what offsets the K3 was showing on the 1Hz display. A bit frustrating with the huge, and apparently stable signals from Connie pounding into the Texas Hill Country, not to be able to have the real time FMT setup up and running! Fingers crossed! ;-)|
Soapbox: Very big signals from Connie during this FMT, as opposed to the propagation last November when both 40m runs were non-existent here! 40m -58dBm minor slow QSB to -90dBm. 80m -52dBm some QSB to -80dBm!
TNX as always to Connie for his continued support of the FMT! 73 Don
|Method: Ten-Tec Jupiter and Spectrum Lab, using WWV and CHU for calibration.|
|Method: Flexradio 3000 in LSB mode. Calibrate Flex using CHU. Tune for 500 Hz beat into Fldigi freq. analysis mode. Subtract beat frequency from display.|
Soapbox: Thanks for a fun activity ! Using a slightly different method this time, so their could be a lot of operator error ! Both signals were of moderate strength here.
|Method: Yaesu FTdx1200 xcvr only|
Soapbox: First attempt at FMT
|Method: Elecraft K3 GPSDO stabilized with fldigi analysis after calibrating K3 internal sound card. I plotted the results of the calibration and the FMT runs with my spreadsheet then visually estimated the average of each run. I then offset the FMT averages by the error seen watching CHU and WWV. I separately calculated results with CHU and WWV then just averaged them. Fun! Can't wait to see the actuals!|
Soapbox: Both the 80 and 40 meter signals were strong here in Arizona. I used my 160m OCF inv V up on the ridge behind our house oriented roughly E-W. I had to take out a bump on 40m as I touched my K3 IF shift during the run. I did see quite a bit of doppler on 40m. Next time hands off the radio! Much fun.
|Method: Icom IC-R75 Receiver|
|Method: K3 warmed up and calibrated against WWV 10 MHZ.|
Soapbox: Both WWV and K5CM strong.
|Method: FT-1000MP with FLDIGI in frequency analysis mode. Three minutes each of data were collected at 2.5, 5, and 10 MHz WWV frequencies before 40 m run, between runs, and after 80 m run. The rest was done in Excel, averaging blocks of measurements, calculating curve fit for error f, regression to calculate corrections at K5CM f, applying corrections.|
Soapbox: This was my first FMT, nudged into action by AD8Y and friends at The Case Amateur Radio Club of Case Western Reserve University, W8EDU.
|Method: FlexRadio 6500 locked to Trimble GPSDO. Denon SD card digital audio recorder fed by FlexRadio, and a HP3325A also locked to GPS generating a 2 kHz audio tone to calibrate out Denon 44.1 kHz sampling rate error. Homebrew GNU Octave code analyzes wav file and does a weighted average of detected frequency.|
Soapbox: My HF dipole ladder line was knocked down by an oak tree falling over in a blizzard last month. And, it was shorted. So I used it as a common mode random wire lying on the ground. Couldn't hear K5CM at all on 80 meters, but that could be blamed on propagation as it was still daylight here on the west coast during the 80 meter run. A later time for 80M would be better!
|Method: FLEX 6700 and FLDIGI.|
Soapbox: Signals were about -95 dBm with 53 dB S/N.
|Method: Hustler vertical to Icom706MkII to Win10 with WSJT-X Cal mode.|
Soapbox: Very nice strong sigs with some Doppler (or was that receiver drift?)
|Method: 89441A VSA and GPS frequency reference|
Soapbox: Thank you Connie
|Method: 80 M dipole, SLM with GPS reference, Spec Lab for a tuning indicator|
Soapbox: Thanks Connie 40 M sig fine. 80 M very weak here in Va
|Method: IC-7610 with GPSDO external reference. Spectrum Lab audio spectrum analyzer. Tune in USB mode until signal is as near 1 kHz as possible and note frequency reading on radio. Measure ~1 kHz beat note and add to radio readout.|
Soapbox: Drift was noted on 40m signal during call up, then it stabilized during key down. WWV on 5 and 10 MHz showing similar characteristics. The spectral trace on the 80m signal was noisy and broadened upwards in frequency by a full Hz but had a stronger trace on the lower edge that I recorded as the measurement.
|Method: Direct conversion receiver, with GPS disciplined VFO, built from QRP Labs modules. DIY audio filter, horizontal loop antenna. WSJT-X v2.1.2 in FreqCal mode. Verified receiver calibration with WWV, CHU, other reference stations.|
Soapbox: Good signal strength on both bands. Thanks to Connie and ARRL for making this event possible.
|Method: Receiver: Icom R8600|
Antenna: Optibeam OB16-3, not resonant on FMT frequencies
GPSDO: TrueTime XL-DC Ref
Used GPSDO as external frequency reference for R8600.
Averaged all Fldigi measurements during key-down period for final results.
Soapbox: 0200Z was not an auspicious time for the FMT here in S.Calif with sunset at 0230Z. Able to copy both 40m and 80m signals, but 80m rapidly varied between S5-S7, with occasional deep fades. Thanks to Connie, K5CM, for hosting this FMT.
|Method: Difference from reference signal method. Elecraft KX3 receiver in USB. QRP Labs HF synthesizer with Rb frequency reference tuned about 15-20 Hz above test signal. Used Spectrum Lab s/w to locate the peak of each signal, measure frequencies, calculate the difference, then write delta values to a file. Evaluate data after the test.|
Soapbox: CW call-up hard to copy on 80m and low SNR on Spec Lab at lower resolution. No problem hearing and seeing 40m signal. Thanks to VE2AZX for the pdf document on "Using Spec Lab for Precise Audio Frequency Measurements". It needs to be updated after 10+ years to reflect the current Spec Lab s/w version improvements and links. More practice using the gear and Spec Lab, and analyzing the data would certainly help me. Thanks to Connie and group.
|Method: SDR Play RSP1A using zero beat on carrier.|
Soapbox: My primary test equipment is in need of repairs so not useable for this test. So I had to use my best guess.
|Method: GPS locked signal HP generator and HP GPS locked counter to generate reference to compare with off air Spectran audio frequency PC program to arrive at final numbers|
Soapbox: 40 meter strong +20 low noise, tone very steady. 80 meter QRM @ S-9 and signal was +5 with QSB, signal had more frequency change over 2 minute key down than 40 meter.
|Method: HP3586B, 80m dipole|
Soapbox: My 3586 is acting up. Seems like L.O. has 4Hz fm component square wave for 20 seconds every minute, but maybe normal in between times. I hope to fix it by November. For now, I am just reading between the lines.
|Method: Kenwood TS-2000, Cushcraft R8 Vertical for 40Meters, End Fed Dipole for 80 Meters, Compaq CQ-56 Laptop, Rigblaster PC Interface, Fldigi software V4.1.08 in frequency analysis mode.|
Soapbox: Conditions were good on both bands. Lots of QSB on 80 meters.I had fun no matter what the outcome is. Thanks to K5CM for hosting this FMT test.
|Method: Ant: Hygain 680 vertical on 40, dipole on 80. radio: Flex 6400. Tek TDS224 SCOPE. Spectrum Lab. HP3336B audio synthesizer. GPS disciplined 10MHz reference.|
Soapbox: I saw more dopler wobble on 80 than on 40. S/N was higher on 40. I had more difficulty fine tuning on 80. We shall see!
|Method: Receiver: ANAN-100D w/ Trimble UCCM GPSDO, PowerSDR mRX PS|
Reference signals: WWV, CHU, HP 8648D w/ Thunderbolt GPSDO
Software: fldigi, TimeLab
Soapbox: Propagation was a much larger factor than last FMT, so I don't anticipate a repeat of my beginner's luck here on my second FMT.
I have gained more appreciation for ionospheric turbulence.
I'm suspicious of my current all-digital audio workflow, whether there are some aliasing effects and the like; but at least for now it appears that my measurement error over the sampling interval is at least an order of magnitude below the propagation effects.
|Method: ICOM IC-718, 80 meter inverted V, PC sound card, FLDIGI software, WWV used to calibrate sound card and radio frequency readout.|
Soapbox: What a great time! Thanks Connie for taking the time to do this. This year I used a different method so hoping for the best. I calibrated my receiver error using WWV on 2.5 MHz and 5.0 MHz 10 minutes before the test signal was transmitted. Used FLDIGI to make all measurements. Took 2 minutes of all measurements and averaged out in spreadsheet. 73’s WB8REI
|Method: ICOM IC-756PROII, Wavetek 3002 Sig. Gen, Thunderbolt GPS, Spectrum Lab software, K1JT's FMT program|
Soapbox: Thanks to K5CM for running the test.
|Method: IC-718 controlled by Flrig and Fldigi.Calibrated sound card and warmed equipment for 2 days. Monitored WWV and CHU frequencies to find most stable reference by looking at error average,error max and error min. Take the stable frequencies and calculate error per hertz. Calculate hertz difference between reference frequency and key down frequency. Then add or subtract error per hertz to key down frequency. This seems to get me close with a shoe string budget. Added Spectrum Lab this time to try to deal with Doppler. Constantly improving my spreadsheet so its lots of fun. Thanks to Connie for his time and equipment again. S9 on 40M and +20 on 80M using end fed antenna. Thanks also to my wife for making sure I didn't miss the FMT Test.I get pretty sad if I do. Hi Hi|
Soapbox: Fun as always. Trying hard to make it to the next level, I think sometime we should do the test and submission the same day. Thanks Connie again for your time and equipment. S9 on 40M and +20 on 80M using end fed antenna.
HF2V antenna, FT-1000MP MK-V transceiver, Signalink USB sound card with input from the data port of the transceiver, HP 3336C signal generator stabilized with an external clock from a Lucent RFTG GPSDO and with the output fed to a T-connector in the antenna feedline through a 40 dB attenuator, DL4YHF's Spectrum Lab software to analyze audio from sound card. The sound card was calibrated before the FMT using the HP 3336C.
Tune the FMT signal to a beat note of about 700 Hz. Set the signal generator to produce a signal that is about 50 Hz different from FMT signal and with an amplitude similar to the FMT signal. When the keydown begins, save the audio to a file using SpecLab. Use SpecLab on the audio file to determine the difference between the two audio signals and then add the difference to the signal generator frequency setting.
Soapbox: Thank you K5CM
|Method: IC-7610, Bodnar mini GPS, FLdigi|
Soapbox: Thanks to Bruce, WA7BNM and special thanks to Mike W9MDB for the help. Thanks Mike for taking the time for a phone call, to work thru the theory with me. This was my second attempt at the FMT, the first with rather dismal results. This time, I calibrated against 4 different sources, CHU on 3.330 and 7.850 and WWV on 5 and 10 Mhz. I'm submitting two results for 80m, one referenced against 3.3 and 5 Mhz, and one against 5 and 10 Mhz, though only .183 hz apart, curious as to which is most accurate. Surprisingly, the 40m result referenced against 5 and 7.850 and 5 vs 10 are EXACTLY the same, so again, curious how I made out. Also thanks to my son, W3JST for his help with Excel.