Results - April 12, 2019 FMT
|Actual Radio Frequencies (Hz):|
K5CM All (<=0.1 Hz):
W3JW, W4VU, W6MSU, W8EDU, WA8KNE
K5CM All (<=1.0 Hz):
AA6EH, AA6LK, AB2UW, AB4EJ, AB4RS, AC1CE, AD5MT, AE5P, AF9A, AJ4YA, AJ5P, K0WM, K1GGI, K1IG, K3TIM, K5RKS, K6APW/7, K6OQK, K6UM, K7HIL, KA1BQP, KA2VLP, KA5QEP, KA8BRK, KD2BD, KD5MMM, KE0ARE, KE8DO, KF4FC, KF7NP, KG2EL, KG4ARN, KG5X, KM6QX, N0PFE, N2GL, N2MD, N3CRT, N3FG, N8OBJ, N8OOU, N8TW, N9MVO, VE2IQ, VE3OAT, VE3ORY, VE3YX, VE6GRT, W1JV, W1KU, W1PJE, W2FD, W2TX, W3JW, W4IVF, W4VU, W4WJ, W5LAC, W5TV, W6BM, W6DSR, W6MSU, W6OQI, W7KPZ, W7SUA, W8EDU, W8GNM, W8TM, W9INE, WA4FJC, WA8KNE, WB0LXZ, WB4SON, WB6HYD, WD4IYE, WQ8T
K5CM 80 (<=1.0 Hz):
AA6EH, AA6LK, AB1AV, AB2UW, AB4EJ, AB4RS, AC1CE, AD5MT, AE5P, AF7NX, AF9A, AJ4YA, AJ5P, AJ7F, K0WM, K1GGI, K1IG, K3TIM, K5RKS, K5TA, K6APW/7, K6OQK, K6UM, K7HIL, K7II, K9NR, KA1BQP, KA2VLP, KA5QEP, KA8BRK, KB0EW, KD2BD, KD5MMM, KE0ARE, KE8DO, KF4FC, KF7NP, KG2EL, KG4ARN, KG5X, KG6HSQ, KI5EE, KM6QX, N0PFE, N1IRO, N2GL, N2MD, N3CRT, N3FG, N5DM, N5KAE, N8OBJ, N8OOU, N8TW, N9MVO, VE2IQ, VE3OAT, VE3ORY, VE3YX, VE6GRT, VE9DAN, W1JV, W1KU, W1PJE, W2FD, W2PKY, W2TX, W3JW, W4IVF, W4VU, W4WJ, W5LAC, W5TV, W6BM, W6DSR, W6MSU, W6OQI, W7KPZ, W7SUA, W8EDU, W8GNM, W8TM, W9INE, WA4FJC, WA8KNE, WB0LXZ, WB4SON, WB6HYD, WD4IYE, WQ8T
K5CM 80 (>1 to <=5 Hz):
AB1UY, AJ8T, K3DRE, K5ND, K9QJS, W0HBK, W1MT, W4PH, W8UM, WA5UCW, WB2CMF
K5CM 80 (>5 to <=10 Hz):
K5CM 40 (<=1.0 Hz):
AA6EH, AA6LK, AB1UY, AB2UW, AB4EJ, AB4RS, AC1CE, AD5MT, AE5P, AF9A, AJ4YA, AJ5P, K0WM, K1GGI, K1IG, K3TIM, K4PH, K5ND, K5RKS, K6APW/7, K6OQK, K6UM, K7HIL, K7KMQ, KA1BQP, KA2VLP, KA5QEP, KA8BRK, KD2BD, KD5MMM, KE0ARE, KE8DO, KF4FC, KF7NP, KG2EL, KG4ARN, KG5X, KM6QX, N0PFE, N2GL, N2MD, N3CRT, N3FG, N8OBJ, N8OOU, N8TCP, N8TW, N9MVO, VE2IQ, VE3OAT, VE3ORY, VE3YX, VE6GRT, W1JV, W1KU, W1PJE, W2FD, W2TX, W3JW, W4ENN, W4IVF, W4PH, W4VU, W4WJ, W5LAC, W5TV, W6BM, W6DSR, W6MSU, W6OQI, W7KPZ, W7SUA, W8EDU, W8GNM, W8TM, W8UM, W9INE, WA4FJC, WA5UCW, WA7BNM, WA8KNE, WB0LXZ, WB4SON, WB6HYD, WD4IYE, WQ8T
K5CM 40 (>1 to <=5 Hz):
AB1AV, KG6HSQ, N5DM, NH6Y, W0HBK
K5CM 40 (>5 to <=10 Hz):
|Method: zero-beating on uncalibrating IC-7100 and reading dial frequency|
|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, Fldigi for spotting, EZGPIB controlling Prologix USB-GPIB and USB-Serial 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. 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. Additionally for this run, Fldigi was used in frequency analysis mode to generate comparison data as a sanity check.|
Soapbox: Thanks again Connie for running the event. The 40M signal was moderate level, but the 80M one was somewhat weak. Both accompanied by the usual multipath distortion.
|Method: FT-817 in AM mode, homebrew GPSDO driving RF synthesizer w/ 1kHz step, beating against homebrew audio DDS.|
Soapbox: Good signals tonight, but you have to be organized to get a reliable measurement in 2 minutes!
|Method: SDRplay RSP2 useing WSPR software|
Soapbox: Both frequencies received well in NH. Like to try different methods
|Method: 98' long W5GI dipole oriented E-W connected to Icom IC-7000 (CW mode). SignaLink interface to laptop running Spectrum Lab. During call up, adjusted a GPSDO (Trimble Thunderbolt) referenced, HP 3335A frequency synthesizer to about the same frequency. After key-down, switched the radio input to the synthesizer (through an adjustable attenuator) and adjusted the synthesizer to the same frequency (used SL peak detect function). Read each frequency directly off the synthesizer. No radio or computer sound card calibration is needed with this method, but warmed both up for several hours so they were stable during the FMT.|
Soapbox: Both 40m & 80m signals strong in FN30. Lots of doppler on both frequencies. Thanks to K5CM for his FMT efforts.
|Method: Flex 6600, GPS Disciplined oscillator, Spectrum Lab|
Soapbox: Why don't we do this at 30m and 20m as well?
|Method: Inverted V antenna, signal received with HP3586B locked to 10MHz reference from Trimble Thunderbolt GPSDO. Sampled the IF with a PC and analyzed using SpectrumLab. Calibrated the PC sound interface with a signal generated from a locked HP3336C.|
Soapbox: Strong signals into Northern Virginia. 40m was -86 dBM, 80m -62.17 dBm. Thanks for running the test.
|Method: Determined ppm offset of my HP8642 with 0.02ppm crystal oven reference to WWV 10MHz using beat counts over 30 sec. period, avg several times before and after test.|
Used same method beating 8642 with test signal, averaging beat counts and correcting for ppm offset.
Soapbox: Reasonable signal strengths on both bands using very marginal antenna system. A fun experiment!
|Method: Icom-7610 w/GPSDO from Leo Bodnar, inverted-v antenna, using WSJT-X's FreqCal to determine sub-Hz accuracy|
Soapbox: Great test. First time doing this. Hope I did it correctly. I received strong signals from K5CM and compared to WWV for final adjustments.
|Method: Flex 6700 w/FLDigi in Freq. Analysis Mode.|
|Method: IC-751A with added OCXO|
Used WSJT-X freq. calibration procedures and Excel graphs.
Soapbox: First time doing this - missed the 40m tone.
Discovered that many broadcast stations are poor calibration sources. Mainly used WWV 2.5, 5, 10 Mhz.
Can see it might be easy to screw up!
|Method: OpenHPSDR Mercury receiver and WSJT-X. 10MHz OCXO calibrated to CHU.|
Soapbox: Great signals on both bands, 30+ dB above the noise. Thanks Connie!
|Method: I used a Elecraft K3s as my receiver, and the spot tone to zero-beat the signal. I corrected the VFO reading for errors and then corrected for historical errors.|
|Method: Icom 7300, fldigi|
Soapbox: Lots of qrn in the south. 40 m was long and somewhat weak here.
|Method: Flex 5000a with PowerSDR and Trimble Thunderbolt. Verifed Estimated the center of the carrier using the spectral display on 40 Meters. On 80 DM780 used to estimate of the carrier frequency.|
Soapbox: This is my first FMT. Next time I will use FFT software.
Soapbox: Elecraft K3, low dipole, fldigi (WWV/CHU) in lower Michigan. Plan to do it again.
|Method: Equipment is a Yaesu FT-1000MP Mark V transceiver (CW mode, narrow CW filter and audio DSP with 60-Hz bandwidth), Rockwell/Collins 180S-1 tuner, 40-meter dipole, Fluke 8845A as an audio frequency meter. Make eight measurements of the CW audio frequency each second; average the eight readings. Apply statistical process control to the one-second averages to eliminate outliers using the Western Electric rules. Calibrate the receiver with a GPSDO, and correct frequency measurements for receiver drift. Do a two-minute run on WWV 5 MHz after the 80-meter transmission to check conditions and analyses.|
Soapbox: Good consistent signals on 40 and 80 meters. Variation on 40-meters, 80-meters and WWV 5 MHz was relatively low. Thanks to Connie K5CM for his continued support of this interesting event.
|Method: Heterodyne with oscillator referenced to gps, measure beat with SpectrumLab|
Soapbox: Tnx to Connie and the League for running the tests.
|Method: K3 and Macbook Pro running Fldigi. Buddipole antenna tuned to 40 meters. Took WWV measurements before and after each test on two different bands to bracket the frequency of interest.|
Soapbox: Both signals were strong; 40 meter was S8, 80 meter was S7. These are the strongest signals I've seen in any FMT. Standard deviation of 40 meter signal however was double that of the 80 meter signal. Little bit of CW QRM on 80 meters, otherwise bands were clear (except for the FT-8 crowd).
|Method: Flex 6600, dipole. centered flex "tune guide" on carrier|
Soapbox: very clean single carrier
|Method: Flex 6500 with fldigi|
Soapbox: Strong signals on both bands. Seemed stability was better on 80m.
|Method: IC 7000 USB 1 KHz below published frequency. Read audio freq on Spectrum Lab and add to receiver indicated freq.|
40 Meter ground mounted vertical both bands.
Soapbox: S9+20 both bands.
|Method: Yaesu FT-847 / 43' vertical antenna:|
SignalLink USB sound card with Spectrum Lab software used for direct comparison between FMT signal and known reference signal generated by a home made GPS disciplined signal generator.
|Method: WSJT-X Calibration to WWV etc. followed by Frequency Measurement. IC-9100 and vertical.|
Soapbox: Great reception on 80 meters and good on 40 meters. Using Cushcraft MA-6V 20 to 6 meter offset vertical dipole.
|Method: I am using homebrew software. Setup uses signal from HP3336B signal generator which is injected via T connector into coax from receiving antenna. HP3336B uses 10Mhz external reference which is supplied by GPS "Thunderbolt" box I picked up from a place in Silicon Valley. I think the "Thunderbolt" was pulled from a old cell tower. I have been using this same setup / method for several years.|
Soapbox: Both 40m and 80m had some QRN but signals were above the noise. 40m signal about S5 and 80m signal about S7. Readings were fairly stable across entire test. I calculate about 20 separate frequency measurements during the test for any given band. Each FFT uses 8192 samples as input. Frequency values of the FFT had a little dispersion of three FFT bins. My FFT bin size is about 0.122 Hz. Each FFT calculation uses 64K samples in the time domain as input. Sample rate is 8000Hz. Reported frequency is average of the separate readings -- each of which involves 8.192 seconds worth of samples from the sound card.
|Method: TS590SG (stock) internal USB audio; WSJT-X 2.0.1 FreqCal mode; Excel|
Soapbox: First try at this after being licensed for 53 years. Totally blew the first (40m) run by not realizing I had to widen the Freq Tolerance parameter. Eye-opening to see how much drift is routine.
|Method: Receiver in CW mode characterized to WWV and CHU, audio output zero beat by ear against digital audio generator through hybrid combiner.|
Soapbox: Good S8 signals, but with doppler and local QRN fierce on 40M.
|Method: I used what I like to call "The I.F. method using my HP-3586B Selective Level Meter and a HP-3336B Signal Generator. To read specifics on how I do this go to: http://www.k5cm.com/k6OQK%20FMT%20NEW.htm|
Soapbox: Connie's signals were good in to Glendale California with little Doppler shift.
|Method: Elecraft K3 with EXTREF option Homebrew GPS disciplined 10 MHz oscillator WSPR/FMT 2.12|
Soapbox: Forgot to close LP-Bridge before start of FMT. Thus lost half of 40m test. Signal levels were excellent in Oregon.
|Method: Calibrated the CW Pitch Frequency, then applied signal audio to Spectrum Lab.|
Soapbox: Both bands strong but varying signal strength. From S3 to S9 just in the short key down period.
|Method: 80M dipole at 90 feet, Kenwood TS440S, Hewlett-Packard AN/USM-281 Oscilloscope, Hewlett-Packard 200AB Audio Oscillator, Fluke F179 multimeter, Sony MSR-7205 Earphones, Hewlett-Packard 12C Calculator|
Soapbox: Took 2 hours to go through the math.Do you have the results for the FMT of the Spring of 1968?
|Method: FT-101EE receiver heterodyned with an HP 3325A function generator GPS controlled. Beat measured on android tablet running keuwlsoft SpectrumAnalyzer app.|
Soapbox: Difficult measurements on both bands. Signals were weak and noisy on 80.
Doppler shift on 40 was a problem. Not much confidence in either measurement.
Thanks for running the test Connie.
|Method: ICOM 756 Pro III and audio beat method interpolated from WWV|
|Method: ICOM IC-756PROIII Calibrated to 15MHz WWV using Spectrum Scope.|
40 Meters 500 Hz CW Filter Signal S7 to S9.
80 Meters 050 Hz CW Filter Signal S9 to +20 over S9.
Soapbox: No High Tech Test Equipment, but had fun with the ARRL FMT event.
Not a Contester.
|Method: Uncalibrated Yaesu FTdx5000 & WSJT-X|
Soapbox: First time...Murphy got my measurements with FLEX6600 using GPSDO
|Method: Used a K3 and panadapter cross checking with a Kiwi SDR near me. Measured transceiver error at WWV 2.5, 5.0, and 10.0 MHz and interpolated for the measured FMT frequencies. Sanity check with SDR.|
Soapbox: Lots of fun and helps learn more about my transceiver.
|Method: Watkins Johnson WJ-8718A with Rb Frequency Standard DL4YHF Spectrum Lab Software. Tune just below carrier, add dial reading to measured beat note. Used 40M vertical for both readings.|
Soapbox: Very strong signals on 40 with occasional deep fade. Slightly less signal on 80 also with deep fade. Significant Doppler on both signals tonight. Thanks Connie for another great FMT!
|Method: TS-590SG with SO-3 TCXO. 10 hour warm up. WSPR 2.12 fmt command line utilities. HRD DM-780 just for the waterfall display. Calibration run about 8:30 local, then the 2 FMT measurements, and a second calibration run about 10:30 local. Quiet band conditions and strong S9+10 signals for both bands here in FN20.|
Soapbox: My first FMT. After years of reading about it and wanting to attempt it, decided to give it a try. I must have caught the “FMT bug” last month at W8EDU while attending HamSCI. This FMT was lots of fun. A little nerve wracking, but fun. Thanks to K5CM and the sponsors.
|Method: Receiver: Harris RF-590, clocked with external frequency standard. Audio was recorded and processed with a Mathematica program I wrote.|
Soapbox: Signal was fair on 40 meters, somewhat weak. Spectrum vs. time looked like a rope with several strands interwoven. Ionosphere was active. 80 was better, but the ionosphere was active there too. Final values are just a guess.
|Method: Icom IC-706MKII|
WSJT-X V2.0.1 FreqCal mode
80 meter droopy dipole, apex at 40 feet
|Method: Ham Transceiver, Rigol DG-1022Z arb generator, Spectrum Lab|
Soapbox: QRM on 40 Meters - no report
|Method: All homebrew equipment including a carrier phase tracking receiver for FMT signal reception, a WWVB referenced frequency standard, and a frequency counter. The receiver's LO was phase locked to the frequency of the unknown carrier minus a 1 kHz offset and measured over several 10 second integration periods. A "selective average" was taken after factoring in the 1 kHz offset. No efforts were made to "out guess" the effects of propagation. More details at: http://www.qsl.net/kd2bd/fmt-methodology.html|
Soapbox: Murphy dictated that this FMT would not go as smoothly as the last. In response, I resorted to measuring the clock of the DDS generator used as my receiver's LO and calculated its output frequency (for 40 meters only). Signals on both bands were very strong, with 40 meter signals suffering many rapid phase shifts (Faraday rotation?). The Kp-index was 2-3. Lots of QSB on 80. It was a pleasure to work Connie on CW after the FMT, but doing so destroyed the unprotected MMIC in my homebrew TV antenna preamp. Murphy always has to have the last word...
|Method: 5 minute ad hoc setup with two ICOM transceivers warmed for 2 hours, calibrated to WWV. Spectrum Lab with and sound subsystems calibrated used for signal comparison and read.|
Soapbox: Had trouble copying 80m through the local qrm that night.
|Method: FT847, Signalink, SpecLab, Excel|
Soapbox: 40m sounded real good, 80m wavered a bit
73 All ..
|Method: ICOM IC-7610 and HDSDR software.|
Soapbox: First attempt at the FMT. I wanted to identify the signal. They were very strong at my QTH. I checked the system against WWV before the FMT. The HDSDR can identify the signal peaks to the nearest hz. Next time I will use software with better resolution and a better averaging system.
Samsung Android tablet
Flag pole antenna
Soapbox: I only used 10 MHz WWV at a reference.
|Method: Flex 6400, fldigi frequency analysis mode, extended double zepp|
Soapbox: Not as confident in results this time. I rushed myself and did not allow enough time to check frequency standards. Thanks to all who helped put on test, lots of fun!
|Method: Kenwood TS-2000. Calibrated using WSJT-X FreqCal mode to WWV on 2.5, 5, 10 Mhz before and after the test. Measured FMT signal with WSJT-X and interpolated between the WWV calibrations. All data and calculations on Excel Spreadsheet. Good signal in central Arizona.|
|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: I had very strong QRN on the 40 meter frequency and had difficulty finding the signal. Fortunately I had recorded the entire spectrum from .5 MHz to 8.5 MHz. I was able to replay the recording and find the signal using very narrow filters. I did not try to make any doppler corrections even though I also had recordings of the 2.5 and 5 MHz WWV signals. The 5 MHz signal was up to .2 Hz low at times.
|Method: Rubidium referenced home-brew double conversion superhet and frequency counter. Measured the second IF frequency and calculated the receive frequency from the first and second LO frequencies and the measured IF. Rigol DG4162, Rb referenced used for the oscillators and FLUKE 1953 frequency counter.|
Soapbox: Signals were strong but 40 meters with dramatic fluctuations in signal level.
|Method: RSP-2 Calibrated with WWV, long wire antenna.|
Soapbox: Lots of doppler shift.
|Method: SDRplay RSP2, Spectrum Lab. Not locked to GPS, but used with signal generator to calibrate and get correction value.|
Soapbox: Week signal on 80M
|Method: Kenwood TS-2000 with Specturm Lab|
Soapbox: I did not get the 40 meter test. Only the 80 meter test is being reported.
|Method: Receiver is Flex-1500 locked to GPSDO, in CW mode. Analyzed ~600 Hz tone with Spectrum Lab. Selected most probable spectrum peak, then corrected for Flex's DDS VFO offset.|
Soapbox: Very strong S9 to S7 signals from simple wire dipole, way above noise levels.
|Method: K3 with P3 and home build AMD based PC with Spectrum Lab. Let the receiver warm up for an hour or so then calibrated local Osc to WWV on 5MHz. AV640 vertical.|
Soapbox: I always have a lot of fun with these. There is a certain level of guesswork that happens due to the rough resolution in Spectrum lab and my ear. Historically, I have not done too bad but we'll see about this one. Signals from Oklahoma were good to Austin on both bands. Band were relatively quiet and stable.
|Method: Kenwood TS-2000, PC with spectrum lab|
Soapbox: Thanks for doing this again, I am already looking forward to November! I wish we could do it even more often.
|Method: GPS disciplined 3586A signal level meter with locked audio audio oscillator and scope to illustrate the lock.|
Soapbox: Thanks for the test. Lots of fun Connie!
|Method: TS-570 audio frequency measured with an Agilent 34461A DMM. Then a rubidium referenced oscillator substituted for the received signal.|
Soapbox: 40 meter QSB
|Method: Flex6400/FLDIGI vs WWV 2.5, 5, 10MHz between 40m and 80m run.|
Soapbox: First time trying with new Flex 6400. Different than the Flex 3000. Easier on the 3000 with auto dial shifting when switching between LSB and USB. That would better allow me to zero beat the audio in USB vs LSB on the 3000. Dont know if there is a setting that would allow me to do that on the 6400.
Good signals into NNJ. Lots of static crashes on 80m. QSB and doppler shifts on both seemed more pronounced this time than in other FMT runs I have attempted. Lots of fun.
|Method: K3, WWV, CHU, Spectrum Lab|
Soapbox: Your signal better than WWV. A little QRN but still usable. Many thanks for another fine event. I like it when it is just two frequencies.
|Method: Yaesu FT-3000 with DigiPan 2.0. Dipole antennas.|
Soapbox: Generally clear frequency, minimal QSB/QRN.
|Method: ICOM 746pro. LSB, zero-beat. 40M vertical; 80M Inverted vee.|
Soapbox: Could not hear the other side of zero-beat on 40. I could on 80, so may get closer on 80. Thanks, and 73.
|Method: FLEX6500, LeoBodnar GPSDO, 135' OCF dipole|
Soapbox: weird doppler shift on 40M that lasted about 12 seconds and was shifted by about 14 sec from the WWV path and the FMT path
|Method: Kenwood TS-480 radio and a computer to count cycles above/below a U3S ref signal.|
Soapbox: I received strong signals on both bands.
|Method: Flex 3000 with tone centered on grid and reading freq on display.|
Soapbox: First time trying it. Can't wait to see if I did it right and was close. Thanks, Roger. N8TCP
|Method: Efratom MFTS, Fluke 6070A, Yaesu FT-980, Signalink USB, Ancient PC / Used the Coupled Ref-Signal, Differential Measurement Method|
|Method: K3S and ARGO software on an ancient Toshiba laptop|
Soapbox: My first FMT experiment with the K3S. I figured out I should have used USB, not LSB. Things could have been better that way. But, I thought of that AFTER the fact.
|Method: Flex 6600M with GPS. WSJT-x frequency measurement.|
Soapbox: Lots of static crashes from nearby thunderstorms, but good signal on 40m. Too early to copy any signal on 80m. Standard deviation of my measurement is about 0.25 Hz. 73 and Aloha from Maui.
|Method: low dipole > TS850 xcvr (CW-narrow, ext-clk) > sound card > FFT. Tune radio for approx 800-Hz tone, note dial freq, measure audio, correct for known errors.|
Soapbox: Good strong signals from K5CM - 80M sounded bad but looked OK on screen, 40M sounded good but "straight line" on screen looked like a boomerang! Made a wild guess, opting to err on high side due to expected Doppler downshift.
|Method: "AM beat frequency method". GPSDO oscillator driving digital synthesizer to inject known frequency into AM receiver, measure beat note between target signal and synthesizer with SpectrumLab audio spectrum analyzer software.|
Soapbox: Signals good on 40 m. But lots of QSB on 80 m, fluttery fading, almost "auroral"! My 80 m measurements were spread over a 1 Hz span. I expect that the Evil Doctor Doppler will have his way.
|Method: No high tech frequency measuring test equipment here, so simply hoping to be in the green!|
Spectrum Lab, Fldigi, WSJT-X software
Calibrated against CHU 3,330 kHz and WWV 10,000 kHz
Soapbox: Been a ham 53 years and this was my first FMT. Never owned a rig with an 8 digit display until now. I'll be happy just to get results in the green box. Enjoyed our short 80M QSO after the FMT. Thanks Connie! Your signal very nice here in Kingston ON. 599 on 40M, and 599+10 on 80M.
73, Rick VE3ORY
|Method: TS-870 with GPSDO using Fldigi for measurements|
Soapbox: The signals were good on both bands, but the doppler was extreme. My calibration runs using CHU 3330, CHU 7850 and WWV 5000 had so much doppler that I gave up on them and just used the frequencies that Fldigi gave me. The warble on the signals made me think of aurora effects.
Thanks again for a fun event.
|Method: SDRPlay RSP-2 receiver, SDRUno software feeding audio to homebrew spectral analysis program. Antenna 20m dipole. Calibrated with WWV and CHU time signals.|
Soapbox: Thanks K5CM - clear steady signals on both bands!
|Method: Sdrplay RSP1 and SDRuno V1.31. SAM DSB mode.|
Soapbox: In my mind, I nailed this test. I am pretty sure I am within 1/10th of a Hertz. If I am wrong, then of course I will blame Connie for HIS measurement error.
This was a good test with strong signals (S6) to the East Coast on both bands.
I liked the seemingly short callup. No fooling around this time.
Following the 80M segment, I copied several CW guys acknowledging you Connie and the test ... including VE3ORY.
Hope all of you are as accurate and precise as I am. I am guessing the entire scientific community will stand in awe and wonderment of my achievement.
|Method: Yaesu FT-DX-3000 direct frequency mesurement.|
Soapbox: Thanks again Connie for generating the test! 599 both bands in Cedar Rapids, IA
|Method: Thunderbolt GPSDO -> HP 3586C, read the display.|
Soapbox: first time! I have no idea what I'm doing. Thanks!
|Method: E-MU 0204 soundcard and Softrock Ensemble RX II. Spectrum lab. 192 KHz sampling rate decimated by 12, 262144 input FFT. Over-the-air offsets calculated from CHU3330, WWV5000, and CHU7850 then interpolated linearly. Forced windows update/reboots starting less than 10 minutes before 0200UTC meant I only recorded 30 seconds of the 40 m test, so I'm curious as to if my post processing of that small dataset got a decent result.|
Soapbox: Strong FMT signals though CHU @ 7.850 was very weak. Thanks for running the FMT again.
|Method: mcHF using SAM mode|
|Method: 80/40/20 fan dipole + NetSDR + custom Gnuradio stack + Digital RF (https://github.com/MITHaystack/digital_rf) + Python/Numpy/Scipy custom scripts|
Soapbox: Third FMT is even better - maybe. Signals seemed pretty strong on both 80 and 40 meters. Unfortunately, CHU at 7850 kHz was not that strong.. and it is one of my 3 calibrators. (The NetSDR is a high stability oscillator but not GPS locked!) Next time, I will have to try a software PLL as that might improve things. Doppler is always tricky. 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: FT1000 MARK V. TUNED CW INDICATOR WITH 60 APF FILTER|
Soapbox: STRONG SIGNALS ON BOTH BANDS
|Method: IC 7100--Measure near 600 Hz. audio output frequency in CW/CW-R modes using oscilloscope, audio generator and frequency counter with scope triggered by near 600 Hz. audio generator. Transceiver frequency dial calibration using WWV 15 MHz.|
Soapbox: Thanks for the TEST, Connie and for the Data System, Bruce. Signals were strong on both bands but signal phases were also very erratic which made measurements somewhat difficult.
|Method: Flex 6700 BG7TBL external GPSDO, WSJT-X FreqCal, 40M Vertical. Ran separate slice on WWV 5Mhz to get an idea of Doppler shift which averaged out to -08 Hz. Lost my 40M entry by rookie mistake of moving the dial without writing the frequency. Tnx 73|
|Method: KWM-380 modified with my own Oscillator board locked to GPSDO. Sound card locked to GPSDO. Use USB mode with a narrow filter. Add Spectrum Lab reading to the receiver dial frequency. Antenna is a 41 ft vertical matched on each band.|
Soapbox: Lots and lots of Doppler shift on 40M this time. Had a very deep fade on 80M. Thank you for giving your time to do this, Connie.
|Method: Elecraft K3, vertical antenna, and WSJT-X. Calibrated K3 to WWV at 10 MHz, then executed a FreqCal cycle in WSJT-X and entered the resulting calibration parameters. Used FreqCal to measure the test frequencies and added the DF average.|
Soapbox: Always enjoyable. First time using WSJT-X for the FMT.
|Method: Flex 6700 (GPSDO) into spectrum Lab|
Soapbox: Signals on both bands were S9 plus 10 dB. The doppler and multi-path were problematic (as usual!) Tnx to Connie and all for the test---
|Method: Ts2000X, GPSDO, WSJTX/freq cal Use GPSDO to establish a frequency correction factor for TS2000X synthesizer, measure audio frequency with WSJTX, establish averaged audio frequency, apply correction factor, in USB mode add audio frequency to TS2000X dial frequency.|
Soapbox: Thanks to K5CM and all others who make FMT possible. Great signals from transmitting station, 599+ on both bands. Always a fun exercise.
|Method: Compared reference oscillator to unknown using audio spectrum analyzer.|
Soapbox: I think my dartboard will need calibration. Thanks to Connie and all for making this happen.
|Method: TEN-TEC OMNI VII WSJT-X FREQ CAL MODE|
|Method: HP3586B with eBay Trimble Navigation 10 MHz oscillator calibrated to WWV on 5 MHz. Antenna 40 M Inverted V at 30 ft. Took about 50 observations during transmission and visually took median values.|
Soapbox: Thanks Connie! Good -77 dBm signal on 40 and -75 dBm on 80 M into NC.
|Method: GPS: Lucent/Symmetricom Z3810AS |
RECEIVER: GPS Locked RACAL 6790/GM
Tunable in steps of 1000Hz, 30Hz or 1 Hz.
SYNTHESIZER: GPS Locked HP 3336B
ZERO BEAT INDICATOR: Tektronix 2213A
ANTENNAS: GAP Voyager, GAP Titan DX, NVIS Dipoles 40 & 80m
CONFIGURATION: The post-filtered 455 KHz IF from the RACAL is fed to CH A
of the Tek. A precise 455,000.000Hz carrier from the HP3336B is fed to the EXT input channel of the Tek. The scope is then set to display 2 cycles of the 455KHz IF waveform, instead of the traditional Lissajous pattern.
PROCEDURE: Frequency readings to 1Hz resolution are quickly made by tuning the RACAL to near zero beat with the aid of the Tek scope. If a signal is “dead on” a Hz point, such as WWV, and there is no Doppler, the waveform will not “slip” in either direction but will just vary in amplitude with changes in signal strength, and the "exact" frequency will be the Racal frequency readout.
If a signal is not "dead on" a 1Hz point, and the waveform is "slipping" L TO R, then the RACAL is tuned BELOW exact zero beat. If a signal is not "dead on"
a 1Hz point, and the waveform is "slipping" R TO L, then the RACAL is tuned ABOVE exact zero beat.
If “stepping” the receiver 1Hz causes the direction of "slip" to reverse, the exact frequency is BETWEEN the current and former readout, i.e. between two concurrent 1Hz points. Also, estimates closer than 0.5Hz, of the actual
frequency, can be made by comparing the "speed" of the ABOVE and BELOW "slip." The slower "slip" is less than 0.5Hz from that 1Hz point.
For more accurate “in-between-Hz” measurements, the RACAL is tuned ABOVE the unknown frequency and the HP3336B is then tuned upward, in 0.001Hz steps, from 455,000.000Hz until the R TO L waveform "slip" stops. The milliHz DELTA is then SUBTRACTED from the RACAL readout to give the “exact” frequency.
Using the regular scope waveform allows very quick “zeroing” of signals, even those that are nearly in the noise. I find it much easier to use than the Lissajous
pattern. It is also very interesting to note the carrier frequency variances that occur during Doppler shift.
Soapbox: 40m: clear frequency, -70dBm, moderate QSB to -90dBm, minor QRN, minor Doppler. 80m clear frequency, -70dBm, some QSB to -85dBm,
very light QRN, minor doppler. Both the 40m and 80m paths not as stable as the November2018 FMT! TNX for all your efforts Connie! 73 Don, W4WJ
|Method: Flex3000, LSB mode. Tune for 440Hz tone (A above middle C), measured tone with a Roland VT-12 Vocal Trainer. Subtract 440 from dial frequency.|
Soapbox: Signals on both 40 and 80 had a bit of fading this evening.
Thanks once again to K5CM for a fun activity!
|Method: Flex 6600 with a 10 MHz rubidium frequency standard. Fldigi software in analysis mode.|
Soapbox: Thanks to K5CM for a fun evening of frequency measuring.
|Method: Hammarlund SP600|
Soapbox: Good signals. Thanks, Connie
|Method: Coherent receiver locked to GPS disciplined 10 MHz standard feeding an HP-5370B counter, also locked to the 10 MHz standard. During the pass, a Windows PC is taking data from the counter via GPIB. Pre-pass, and post-pass, using WWV at 5 MHz to estimate Chris Doppler's shift.|
Soapbox: 40 meter receiver noise level into 200 Hz bandwidth was -123 dBM. Test signal was -79 dBm +- 5 dBm. 80 meter noise was -113 dBm, and the test signal was -80 dBm +- 8 dBm. Thanks to K5CM for a fun run.
|Method: KPH WebSDR (Maritime Radio Historical Society) Point Reyes, CA - FlDigi|
Soapbox: Thank you. 73
|Method: GPS locked HP 3336B signal generator feeding left oscilloscope channel. GPS locked HP3586B selective level meter, the I.F. output of which feeds the right oscilloscope channel. The FMT signal is tuned in with the HP3586B until zero beat is shown on the oscilloscope. The frequency is then read from the display on the HP3586B.|
Soapbox: K5CM signals were good on both 40 and 80 meters here in Southern California. There was the usual Doppler shift that makes the FMT an interesting challenge.
|Method: IC-718 w/ stable crystal corrected via WWV, SignalLink USB, indoor wire antenna, frequencies measured with fldigi on Windows 7.|
Soapbox: 40m loud enough and clear. 80m very weak, but readable. Thanks to K5CM.
|Method: Elecraft K3 calibrated manually before the FMT Run and after the run against CHU at 3.33 MHz and WWV at 5 and 10 MHz. Did not see any linear change of error over time or frequency so just averaged the error and subtracted from each FMT measured frequency.|
Soapbox: My first FMT. Used my Elecraft K3 manually calibrated before and after the FMT then averaged my errors. Will be fun to see how well I did!
|Method: FTdx1200, Windows 10 computer running fldigi.|
Soapbox: Used a different technique to calibrate the soundcard: Measured WWV and changed soundcard calibration to null out systematic errors in transceiver. Measured WWV 2.5, 5, and 10 during the 30 minutes before the keydowns and interpolated the measured calibrations for the 40 and 80 meter callups. Had many engineering students involved in a training session a week before and this evening. The math department is now interested in studying frequency estimation methods with us. Great fun! DE AD8Y, CARC faculty advisor.
|Method: FlexRadio 6600M GPS frequency locked to Trimble Thunderbolt 10MHz GPSDO. |
Spectrum Lab v 2.94 audio spectrum analyzer DAX interfaced to Flex 6600M to get sub 1Hz resolution
I2PHD SDR software ECSS function to determine zero phase drift if on 1Hz integer frequency step. Beverage receiving antenna.
Soapbox: This is my first FMT experience. It was interesting to watch the sub 1Hz. doppler shifts on Spectrum Lab.
I hope I get into the green box.
73, Geoff - W8GNM
|Method: Elecraft K3 warmed up and calibrated vs. 10 MHz WWV. Fractional Hz are guesses.|
Soapbox: All signals strong, both WWV and K5CM.
|Method: No computer used. Just pencil, paper, CHU (was unreliable on 40M), and counting beats with a spot button. Yaesu FT-1000. |
Got on the radio ~45 mins before the FMT to listen to WWV and CHU and did some time averaging. Tried to guess whether I was above or below the standards by tuning up and down octaves. Absolutely no clue whether I did that right. This is my first FMT.
Soapbox: W8UM OP N9KIT, first FMT for myself, upon being prompted by W8EDU. If I got within 10 Hz, that means I went added/subtracted in the correct direction from the dial frequency. At this point, it's 50/50 whether I went the right way.
I might have mis-counted the start of the 7MHz signal. Counting beats required more concentration than I expected. I have a bit more confidence in my 80m number, but could be totally off.
|Method: Flex 6700 using WSJT-x|
Soapbox: My first FMT
|Method: FLEX 6700|
Soapbox: 40MTR signal was -81dBm with S/N=48dB and F(Std Dev)=41mHz. QSB=5dBp-p. 80MTR signal was -78dBm with S/N=64dB and F(Std Dev)=100mHz. QSB=9dBp-p.
|Method: A 785 ft horizontal loop antenna, an Avantek preamp, a Rigol 815 Spec An, a Human Disciplined Oscillator (HDO), and an arbitrary correction factor.|
|Method: Kenwood TS 570S Off center fed dipole at 40 ft|
Soapbox: Tnx Connie
|Method: ThunderBolt GPS std, HP SLM, Dipole antennas|
Soapbox: Lots of fun. Sorta Noisy though.. Good signal on 40 and 80M.
|Method: Elecraft KX3 with Spectrum Lab, checked against 5 MHz WWV before and after data run.|
Soapbox: This is my first FMT. Signals were strong with minor fading (3-4 second period). Great fun - thanks to Connie and the others who made this possible.
|Method: Rig: Icom 7610|
Antenna: SteppIR DB-36 configured for 40m for both measurements
GPSDO: TrueTime XL-DC Ref
In past FMTs I've used Spectrum Lab software for determining the frequency and a GPSDO-referenced HP-3336C signal generator as a calibration reference. For this FMT, I used WSJT-X Vers. 2.01 software in FreqCal mode (wasn't able to get WSPR FMT software working in time) to directly determine sub-Hz frequency from GPSDO-referenced 7610.
Soapbox: Although both 40m and 80m signals were good copy in S.Calif, experienced QSB with deep fades for both. Thanks to Connie, K5CM for hosting this FMT.
|Method: SunSDR2pro with GPSDO and WSJT-X|
|Method: HP3586B, Spectrum Lab, Trimble GPS 10MHz ref, 80m dipole, mini-whip.|
Soapbox: Tnx to all who make these tests possible. - bill
|Method: Kenwood TS-2000, Cushcraft R8 Vertical for 40Meters, End Fed Dipole for 80 Meters, Compaq CQ-56 Laptop, Rigblaster PC Interface, Fldigi software in frequency analysis mode.|
Soapbox: Conditions were good on both bands. Lots of doppler on both bands. I had fun no matter what the outcome is. Thanks to K5CM for his FMT efforts.
|Method: RACAL RA6790/GM receiver slaved to Fluke PM6685R Rubidium Calibrator. Audio fed into calibrated sound card and analysis performed with DL4YHF's Audio Spectrum Analyzer software.|
Soapbox: Signals S9+ on 40m & S7 on 80m in RI. 80 had much more QSB. Large Doppler swings on both bands (0.36 Hz/40m & 0.23 Hz/80m). In memory of my mentor and friend John King, WA1ABI, a long time FMT-nut.
|Method: Flex 6400, Spectrum Lab, HP3336B synthesizer, TDS224 scope, HP 1740A scope, dipole|
Soapbox: good signals on both bands
|Method: IC-718 controlled by Flrig and Fldigi.On vacation so I connected remotely but not sure about my results.Thanks to Connie for the strong signals in Kentucky.|
Soapbox: Thanks to Connie for the strong signals in Kentucky.
|Method: FT-1000D receiver, Fluke 6070A signal generator with GPSDO oscillator input for a reference signal, Spectrum Lab for audio analysis|