Results - November 12, 2021 FMT
|Actual Radio Frequencies (Hz):|
K5CM,W8RKO All (<=1.0 Hz):
AB4RS, K1LTJ, K5CM, K5RKS, K7NG, K8YUM, K9JM, KA8BRK, KE6ZLX, KM6QX, N0MFD, N1IRO, N1NAZ, N2MD, N3RF, N8OBJ, N8TW, NA2SW, VE2IQ, VE3YX, VE6GRT, VE7CNF, W1HB, W3JW, W4EDX, W7SUA, W8WTS, W9GR, WA1SXK, WA2DVU, WA7BNM, WA7X, WQ8T
K5CM 80 (<=1.0 Hz):
AA3I, AA6LK, AB2UW, AB4RS, AC6TK, AD7G, AF9A, AJ4YA, AJ5P, GW4BVE, K0WM, K0YQX, K1LTJ, K4CXX, K5CM, K5RKS, K6FOD, K7NG, K8YUM, K9JM, KA5QEP, KA8BRK, KD2BD, KD5FX, KD5MMM, KE6ZLX, KF6HI, KG6HSQ, KM6QX, M0MTQ, N0MFD, N0PFE, N1IRO, N1NAZ, N2MD, N3RF, N5KAE, N8OBJ, N8TW, N9BPL, N9MVO, NA2SW, VE2IQ, VE3GSO, VE3YX, VE6GRT, VE7CNF, W1HB, W1KU, W1QG, W2EMN, W2FD, W3JW, W4EDX, W4IVF, W4LQA, W5LAC, W6BM, W6DSR, W7PUA, W7SUA, W8EDU, W8WTS, W9FLA, W9GR, W9INE, W9MDB, W9ZB, WA1N, WA1SXK, WA2DVU, WA4FJC, WA5UCW, WA7BNM, WA7X, WB5EXI, WB6HYD, WO7V, WQ8T, WS3W
K5CM 80 (>1 to <=5 Hz):
K4PPK, K8DJR, KA9SVR, KB2HSH, W1JV, W7GW
K5CM 80 (>5 to <=10 Hz):
K5CM 40 (<=1.0 Hz):
AA3I, AA6LK, AB2UW, AB4RS, AD7G, AF9A, AJ4YA, GW4BVE, K0WM, K1LTJ, K4PPK, K5CM, K5RKS, K6FOD, K7NG, K8DJR, K8YUM, K9JM, KA5QEP, KA8BRK, KD2BD, KD5MMM, KE6ZLX, KF6HI, KG6HSQ, KM6QX, M0MTQ, N0MFD, N0PFE, N1IRO, N1NAZ, N2MD, N3RF, N5KAE, N8OBJ, N8TW, N9BPL, NA2SW, VE2IQ, VE3GSO, VE3YX, VE6GRT, VE7CNF, W1HB, W1QG, W2EMN, W2FD, W3JW, W4EDX, W4IVF, W6BM, W6DSR, W7PUA, W7SUA, W8WTS, W9GR, W9INE, WA1N, WA1SXK, WA2DVU, WA4FJC, WA7BNM, WA7X, WB6HYD, WO7V, WQ8T
K5CM 40 (>1 to <=5 Hz):
AC6TK, KB2HSH, KD5FX, N9MVO, W7GW, W7KPZ, W8EDU
K5CM 40 (>5 to <=10 Hz):
W8RKO 80 (<=1.0 Hz):
AB4RS, AC6TK, AJ5P, K0YQX, K1LTJ, K4PPK, K5CM, K5RKS, K7NG, K8YUM, K9JM, KA8BRK, KD2BD, KD5FX, KE6ZLX, KM6QX, N0MFD, N1IRO, N1NAZ, N2MD, N3RF, N8OBJ, N8TW, N9MVO, NA2SW, VE2IQ, VE3YX, VE6GRT, VE7CNF, W1HB, W1KU, W3JW, W4EDX, W7SUA, W8EDU, W8WTS, W9GR, W9MDB, WA1SXK, WA2DVU, WA4FJC, WA5UCW, WA7BNM, WA7X, WQ8T
W8RKO 80 (>1 to <=5 Hz):
K8DJR, N0PFE, W7GW, WB6HYD
W8RKO 80 (>5 to <=10 Hz):
K6FOD, KE0NRE, W4IVF
W8RKO 40 (<=1.0 Hz):
AA6LK, AB2UW, AB4RS, AC6TK, GW4BVE, K0WM, K1LTJ, K4PPK, K5CM, K5RKS, K6FOD, K7NG, K8YUM, K9JM, KA5QEP, KA8BRK, KD5MMM, KE0NRE, KE6ZLX, KG6HSQ, KM6QX, M0MTQ, N0MFD, N0PFE, N1IRO, N1NAZ, N2MD, N3RF, N8OBJ, N8TW, N9BPL, N9MVO, NA2SW, VE2IQ, VE3YX, VE6GRT, VE7CNF, W1HB, W1QG, W3JW, W4EDX, W4IVF, W6DSR, W7PUA, W7SUA, W8EDU, W8WTS, W9FLA, W9GR, W9INE, WA1SXK, WA2DVU, WA5UCW, WA7BNM, WA7X, WB5EXI, WB6HYD, WO7V, WQ8T, WS3W
W8RKO 40 (>1 to <=5 Hz):
W2EMN, W7GW, W9ZB
W8RKO 40 (>5 to <=10 Hz):
|Method: TS590S receiver using WSJT-X software. Calibration using a GPS receiver 10 MHz output and CHU 3.3 MHz received signal.|
Soapbox: Enjoy the challenge and having fun with ham radio.
|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 once again to Connie and Michael for running the event. Nice to have relatively clear air for a change (not as much flutter). Readings between SpecLab and phase-slip measurements were surprisingly close, which of course is cause for skepticism that my reported values are even close.
|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 as seen on the waterfall. 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: Forgot about the freq shift from callup to key-down for the first measurement-data may be bad. Was surprised how different W8RKO's 80m freq was from the published data ("near 3598 kHz").
|Method: Trimble Thunderbolt GPSDO used for frequency reference. Used HP3586B Selective Level Meter locked to 10 MHz reference as receiver. Sampled IF with computer soundcard with SpectrumLab for analysis. Used HP3336C Frequency Generator for calibration.|
Soapbox: Interesting as always. All signals were strong into Northern Virginia except for W8RKO 40m, which was not audible, but SpectrumLab was able to pick it out. The energy was spread over a couple Hz, so I hope I guessed the right thread.
|Method: Hp8920a generating to TS2000 and Spectrum Lab.|
beat to incoming sig by ear to nearest Hz.
|Method: Used FTDX3000, GPSDO, and a Freq. Counter.|
Soapbox: Spent a lot of time learning about my equipment; very useful. Thanks to Connie and the FMT team for putting on this event.
|Method: Open HPSDR Mercury receiver with external 10MHz ocxo calibrated against WWV & CHU. Measurement with WSJT-X Freq Cal mode.|
Soapbox: 40m was tough here. K5CM was only about 10dB above the noise max. W8RKO wasn't much better. On 80m, K5CM was 50dB above the noise, W8RKO about 30dB above the noise. Thanks guys for another fun FMT.
|Method: Used a K3S with EndFed Wire. I zero beat the signal, then adjusted with the historical error on the tuner.|
Soapbox: Always a blast.
|Method: IC-705 and FL-Digi|
Soapbox: 40 was long, not strong enough to measure on backscatter. 80 meters only fair.
|Method: IC-7610 GPS locked with synth errors corrected. Spectrum Lab. Data cleaned with custom Python script. Iono doppler estimated using CHU.|
Soapbox: No signal from W8RKO on 80m. Good fun. Thanks for organising.
|Method: Measured receiver audio frequency in the CW mode for the unknowns, WWV, CHU or a GPSDO standard. Used homebrew Excel spreadsheets developed over several FMTs to calibrate the receiver, correct for drift and calculate the unknown frequencies.|
Soapbox: Strong steady signals for both stations on 40 m. Good signal for K5CM on 80 m. W8RKO was difficult copy on 80 m. Thanks to Connie and Michael for continuing to support this interesting event
|Method: Spectrum Analyzer fed with a home-brewed (version of a W7IUV's) RF Amp. A GPS disciplined 10MHz. source - in combination with a home-brewed WWVB disciplined 24MHz. Xtal. VCO - providing the Analyzer's external time base. An (eBay resurrected - 'Parts Unit') FT-757GXII+ in // with the Analyzer for FMT's Morse announcement.|
Soapbox: 40m. signals were scarcely heard and found to be unusable. With a high noise level on both bands (S8-S9 noise) it was surprising to hear K5CM clearly coming through at S9+10! However, though W8RKO was also strong on 80m., partway through the 1 minute period measurements were corrupted by QRM on the transmitted signal (causing me to mathematically average several 1/10th Hz. FMT readings to the nearest 1/100th Hz.).
|Method: FLEX 6600m |
Freq Counter and Scope
Soapbox: Weak signals with my Flagpole vertical in Florida. Conditions were not very good here on 40. Signals were a bit better on 80.
|Method: Used aural zero-beating with the Double Carrier Heterodyne Technique, a receiver, and a synthesizer with 0.1 Hz resolution. Calibration was from WWV-5 and WWV-10, and from a local GPS source.|
Soapbox: Signals levels were unusually low except for a still weak K5CM on 80 m. The WWV-10 signal decreased during the measurement hour. A big "Thank you" is due to K5CM and to W8RKO for providing the test signals.
|Method: Calibrated my Icom-7300 using WWV at 5.000 MHz and used FLDIGI to make my measurement during the event.|
Soapbox: K5CM's signal on both 40 and 80 meters was excellent. W8RKO's 40 meter signal was weak here in FL but the 80 meter signal was strong. The W8RKO key down time appeared to last only 15 to 20 seconds (a challenge to complete the frequency measurement). Thanks to both of you for a fun event again.
|Method: TX: HP Z3801 GPS frequency standard, HP-3336b. A 10 db transistor amp follows and drives a 12by7 / pair 6146. Then to the final amplifier (8877) running 700 watts out. There are no mixers or any device in the chain of amplifiers that might impact the accuracy of the GPS frequency source. |
RX: K3 in AM mode with low side injection from a GPS locked HP-3336B. Audio is feed to Spectrum lab.
Soapbox: Mike had a strong signal on 80 meters, but 40 meters was already starting to skip over me. Despite the difference in strength, 80 meters probably had more Doppler. From previous readings a strong signal in not a requirement for a good reading.
73, Connie / K5CM
|Method: Injected signal from HP3336B into receive antenna. HP3336B used external 10 MHz time base provided by GPS disciplined time base. Used homebrew software written in C# to show spectral display of audio tones from receiver. Used peak detection algorithm to determine audio tone resulting from off the air RF signal and injected RF signal.|
Soapbox: All of the signals were usable. I did not encounter any QRM. K5CMs signals were about S3 on 80m and S2 on 40m. W8RKOs signals were about S6 on 80m and S5 on 40m.
|Method: 11m broadband receive-only vertical antenna + HP3586B selective level meter + HP3336B signal generator w/ Trimble Thunderbolt GPSDO, Lissajous pattern displayed on analog oscilloscope per K6OQK's method (http://www.k5cm.com/k6oqk%20fmt%20new.htm). Anan 100D and Fldigi used as a "spotter plane" to rapidly locate signal and serve as second point of reference.|
Soapbox: Here in Southern Californian, K5CM signal was in fair amount of noise on both 40M and 80M. W8RKO 40M was the clearest and most stable signal of the evening. W8RKO 80M in moderate noise before it dropped. Great fun, thanks to Connie and Mike.
|Method: IC-7610 & vertical antenna, FLDIGI.|
Soapbox: I hope the results indicate I'm getting better at this.
|Method: IC-7300 calibrated with WWV, audio beats against 1KHz tone.|
|Method: Signal Hound SA44B as IQ recorder (with ext reference from Rb std)|
DXE loop antenna
Home-spun C program for analysis of IQ phase slope as measure of frequency offset between target signal and the set center freq of the SAa44B.
|Method: Calibrated K3S + tuning forks|
Soapbox: Good signals for both on 40m. 80m signals had QSB of 15 to 20dB K8RKO aborted after 30 seconds. What happened??
|Method: Receiver ICOM IC-R9500, audio was recorded and analyzed with Mathematica signal processing routines.|
Soapbox: Signals were somewhat weak, but frequency scatter was not too bad.
|Method: Icom IC-706MKII, 80 Meter droopy dipole, WSJT-X, Excel|
Soapbox: 40 Meter signals were weak, readable. K5CM 80 Meter signal 40+ over S9, W8RKO 80 Meter signal weak, readable
Thanks to K5CM and W8RKO and all others who help with this. Hope Mike's tuner is not badly damaged.
|Method: Icom IC-735 with end fed random wire antenna using WSPR for measurement.|
Soapbox: Signal conditions were terrible.
|Method: Yaesu FT-817ND with fldigi 4.01 in Analysis mode.|
Soapbox: Unbelievable signals from Connie tonight...the new vertical on my end is working well. Not a lot of fluctuations in signal.
|Method: All homebrew equipment including a carrier phase tracking receiver, a WWVB referenced frequency standard, end-fed 40 foot wire antenna, and a frequency counter. Method involved phase locking the receiver's DDS 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 an average of the readings after factoring in the 1 kHz offset. Details available at: https://www.qsl.net/kd2bd/fmt-methodology.html|
Soapbox: The solar flux was 85 and the Kp-index was 1. On 40, K5CM was weaker than expected and there was NO copy of W8RKO, suggesting the MUF was below 7 MHz. However, Mike was exceptionally strong on 80, and I managed to get 30 seconds worth of measurements before his TX equipment failure occurred. Connie drifted higher by 0.2 Hz throughout the keydown period on 80. 73.000 de John, KD2BD
|Method: FLEX6300 (no GPS) with Spectrum Lab. Calibrated to WWV 5.0 MHz signal on 40 mtrs, 2.5 MHz signal on 80 mtrs.|
Soapbox: K5CM 80 M Signal was 59+, W8RKO 80 M signal was S9+20 but faded to nothing in about 30 seconds. K5CM was S9 on 40 M and W8RKO was weak on 40 M.
|Method: FT-847, SpecLab, CHU for reference|
Soapbox: K5CM was weak here on 40m, W8RKO dropped out during key down on 80m but I did get a measurement.
Thanks and 73 ..
|Method: Hardware: IC-7300, 40m OCF dipole, Leo Bodnar Precision GPS Reference Clock, HP laptop PC|
Software: fldigi in FMT mode
Method:IC-7300 drift compensated from pre- and post- frequency calibrations
Soapbox: Weak propagation to and strong QRN at my QTH on both bands from both stations.
|Method: Kenwood TS-830S and 'ear'|
|Method: Nooelec NESDR smart, Ham it up v1.0, Distill am bandstop filter. Mega loop ant MLA-30. GQRX and Fldigi FMT on a linux box. U-BLOX LEA-M8T-0-10 Huawei GPS module in fixed mode providing reference freqs . (REF freq - UNK freq) + GPS freq.|
Soapbox: Strong signals into San Diego. Thank you K5CM and W8RKO for a challenging and enjoyable event.
|Method: Kenwood TS2000 and dipoles, using WSJT-X in freq measurement mode, comparing unknown signal to Leo Bodnar GPS disciplined PLL.|
|Method: IC-7300, FLDIGI|
|Method: Used a Pixel magnetic loop antenna into a Flex-1500 locked to a Fury GPSDO. Analyzed the ~600 Hz CWU tone with Spectrum Lab. Selected most probable spectrum peak, then corrected for Flex’s small DDS VFO offset.|
Soapbox: All strong signals, ~10 dBm above noise level, received here near San Francisco on magnetic loop antenna.
|Method: FT991A, Leo Bodnar Mini GPSDO, Marconi 2022E, Spectrum Lab|
Soapbox: First FMT, very interesting - FT991A, Bodnar GPSDO reference into Marconi 2022E sig gen generating RF 1Khz higher than FMT carrier and mixed. Resultant AM audio into Spectrum Lab to measure frequency. No signal from W8RKO on 80m was getting spurious signals on that frequency at my QSO in UK. Thank you Connie and Mike for this bit of fun it would be good to do it each quarter
|Method: KiwiSDR: http://w9adkiwi.hopto.org:8073/|
Soapbox: Lots of fun, thanks!
|Method: Flex 3000 and Ham Radio Deluxe with DM780|
Soapbox: Signals were strong here in Washington, MO. Odd interference on the last one, W8RKO on 80M, also his signal took some deep fades right at the end of keydown. Had a lot of fun trying out different equipment beforehand and comparing to WWV and CHU.
|Method: Elecraft K3, AV640 vertical, P3 panadapter, Spectrum Lab running on AMD Ryzen 7. Zero beat method while observing Spectrum Lab. Let K3 'warm up' for several hours prior then tuned to 5MHz WWV pilot.|
Soapbox: As usual, I always find these entertaining. I was doing some deep space imaging at the same time so had fun using multiple parts of the electromagnetic spectrum. K5CM was probably skipping over me for the most part but I heard WB8RKO just fine on 40m. I don't have an 80m antenna yet but listened on my 40m vertical albeit signals were much quieter, obviously.
|Method: Kenwood TS-2000 in CW mode with Bodnar GPS Reference, SpectrumLab|
Soapbox: Good signal on K5CM, not a great copy on W8RKO on 40, better on 80.
|Method: GPSO, FLEX-6600, FLDIGI|
|Method: Receiver used was a Kenwood TS-950SD. The oscillators were from a Tektronix AFG31152 signal generator. A Keysight 53220A frequency counter was used to measure the baseband frequency. Serial frequency data was collected and saved to a USB drive then transferred later to a spreadsheet for processing. Both the signal generator and frequency counter were disciplined by a Jackson Labs Fury 10MHz GPSDO. The unknown test frequencies were determined by calculation. Antennas used were a 160M ¼ wave sloper for 40M and a sloping 80M dipole both at a height of 50 feet.|
Soapbox: 40M signals were generally weak with K5CM about 3 dB stronger. Some brief but prominent QSB was seen.
80M signals were initially very strong but did have severe QSB with complete dropout. There was digital mode (Olivia?) interfering with the copy here for the K5CM run. With W8RKO that 80M interference was reduced after the favorable move down in frequency.
Thank you Connie and Michael for making this event possible. I had lots of fun preparing and participating.
|Method: HP 8657B Signal Generator + Ten-Tec Orion II transceiver, frequencies measured using SpectrumLab.|
Soapbox: Second time trying the FMT, much better/smoother than the first. W8RKO tone faded in and out on 40m, otherwise pretty decent reception.
|Method: IC-745pro, WSJT-X, calibrated on WWV 5, 10, and 15 MHz, G5RV antenna,|
Soapbox: Good signals !! Late 80M was within QRM at the operator's site I suppose.
|Method: FLEX 6500, HP Z3801A GPSDO, FLDIGI V1.18 in analysis mode, Gap Titan and 80M OCF dipole antennas|
Soapbox: Lots of Ionospheric TID's - W8RKO 80M seemed to die 50 sec into it
|Method: FT-DX10, Fluke 6070A, Motorola MTFS: Reference Offset Method|
Soapbox: First Time w/ FT-DX10 as receiver
|Method: SDRPlay RSPduo with Leo Bodnar GPSDO as a 24MHz reference.|
Calibrated with a second Leo Bodnar GPSDO.
Analysis using FLDigi and Matlab.
Soapbox: W8RKO on 40m was quite weak at my QTH, but I had better reception for the other three tests.
|Method: Elecraft K3S to a Raspberry Pi running FLDIGI Frequency Analysis|
Soapbox: The 40 Liter stations were very weak, here. 80 was better. W8RKO on 80 was blasting in. It's been a few years since I tried the FMT, and this is different equipment and software than on previous tries.
|Method: GPS-referenced TS-850 -> soundcard, measure audio freq, adjust for known offsets. No propagation correction.|
Soapbox: Had fun again, thanks to all.
|Method: Icom 7610 in USB, checked against WWV, and Spectrumlab on the trusty laptop.|
Soapbox: Did not hear W8RKO at all.
|Method: FLdigi FMT mode. TS870 with Ref. Osc. replaced by Bodnar mini GPSDO. This time I didn't use the Ref in the FMT mode, instead I captured the data on Unk only, then afterward, did a separate run with the GPSDO referenced sig gen set near the unknown freq and the rig set to exactly the dial freq used during the FMT. That gave me the rig error for that dial setting. Earlier test had shown that the sig gen was accurate to a few mHz. Maybe that method will work!!|
Soapbox: All the signals were quite good but there was lots of Doppler. My W8RKO 80 m result is for just the portion before the failure. My measurement for the 2nd part was 90 mHz lower, but the signal was very weak.
Thanks again Connie and Mike and I hope Mike's failure won't be too expensive!
|Method: 2 SDRduo receivers, 1 chasing the test signal, the other simultaneously recording WWV and CHU time signals. Analysis of the audio signals by homebrew program.|
Soapbox: Three good stable signals, and W8RKO 80m was very workable until it faded.
Thanks again for a great challenge, and some good fun!
|Method: My receiver was an IC-7410 in USB mode. I used a Trimble GPS-disciplined oscillator clocking a Rigol function generator to give an accurate reference signal on 80m or 40m. For each run, both the on-air and reference signal were in the passband. Fldigi in FMT mode was used to measure the two audio tone frequencies simultaneously. The frequency difference was added to the known reference to give the on-air frequency. Good measurements, after the measurement filters stabilized, were averaged to get my final results.|
Soapbox: Lots of QRN from rain here but the signals were usable. The last W8RKO transmission on 80m was quite short but the signal was stable.
|Method: ANAN-7000dle, Spectrum Lab, WWV reference|
|Method: local kiwisdr -> pulseaudio monitor output -> fldigi fmt mode, no reference, average dropping outlying 10%.|
Soapbox: first time not using a GPSDO; I wonder what horrid transcription errors I've made.
|Method: RS-HFIQ, WSJT-X calibration off of CHU 3.33 and WWV 5.|
Soapbox: Thanks for running this again.
|Method: Hp 3568B Selective Level Meter using IEEE488 to transfer data to MATLAB for plotting and analysis.|
Soapbox: Signal levels were in the -85 dBm level with deep QSB.
Exercise was more difficult than I thought it would be.
No reception of W8RKO on 80m.
|Method: ICOM IC-7610 with rubidium standard and oscilloscope for reading frequency offset.|
Soapbox: Definitely much stronger signals from K5CM. I couldn't hear W8RKO at all on 80 meters, while K5CM was S-9.
|Method: IC7100/CW/CW-R/MEASUREMENT OF NEARLY 600 HZ. AUDIO OUTPUT TONE USING OSCILLOSCOPE, AUDIO GENERATOR AND FREQUENCY COUNTER.|
Soapbox: 40 METERS WAS RATHER QUIET TONIGHT AND K5CM HAD AN S9 SIGNAL ON 40 BUT W8RKO WAS NOT READABLE ON THAT BAND. ON 80 METERS, THERE WAS A LOT OF NOISE BUT BOTH STATIONS WERE S9+20 dB. W8RKO SIGNAL NEARLY DISAPPEARED HALF WAY IN THE KEY DOWN TEST. THANKS AGAIN TO CONNIE AND MIKE FOR YOUR EFFFORTS.
|Method: IC-7610 (with external oven controlled xtal osc (OCXO); into Spec Lab|
Soapbox: Signals on 40M were noticeably lower than normal. K5CM was S9 and W8RKO was S1 ( and that may be optimistic!--this might be partially do to skip) All useful date for SL however. On 80 meters sigs seemed normal , K5CM S9+20dB and W8RKO S9+25dB. Doppler and multipath were NOT rampant.
|Method: Spectrum Lab, IC-7610, GPS 10Mhz Reference Osc.|
Soapbox: 40 Mtr K5CM 53-54 QSB, W8RKO 57-58.
80 Mtr K5CM 59 solid, W8RKO 59 then SUDDEN drop to 53 ?? Why do stations change freq. from call up activity to Key Down ? It is slight but a retune is necessary. Thanks to K5CM & W8RKO for fun night.
|Method: GPS phase-locked reference injected into receiver input. Frequency delta measured with Spectrum Lab software.|
|Method: IC-7300 calibrated to CHU 3330. Long wire end fed antenna|
Soapbox: Good copy on both stations. K5CM had better signal
|Method: Flex 3000 calibrated to CHU, Fldigi.|
Soapbox: Unfortunately a scheduling conflict kept me from participating in all but one frequency measuring attempt, and I was unable to do a proper warm up. Probably WAY off !
Thanks again for a fun activity !
Soapbox: Not a good night.
|Method: LPDA antenna feeding a coherent receiver locked to 10 MHz GPS disciplined L.O. and on to a 12 digit counter with GPIO data output fed to a Windows 10 PC. Polynomial fit to the minute of data.|
40 m K5CM's signal started at 7064097.5 and then migrated to 7064125.02. His 80 m signal started at 3597945.5 and migrated to 3598039.05 Is there extra credit for that observation?
There was a digital signal at the 80 m Ohio time slot in the expected frequency slot and it took me some time to figure out how much lower the real test frequency was. I lost some accuracy in that final test.
Soapbox: 40 m K5CM signal power to receiver was -81 to -71 dBm.
40 m W8RKO signal power to receiver was -79 to -67 dBm. (Ohio stronger than Oklahoma?)
80 m K5CM signal power to receiver was -77 to -69 dBm.
80 m W8RKO signal power to receiver was -79 to -63 dBm all powerful signals here on the left coast.
Thanks to K5CM and W8RKO for a fun test even in a totally fogged-in ham shack.
|Method: K3S GPSDO locked, sidetone match|
|Method: SDRPlay RSP1A with SDRUno software, 20-foot wire indoorantenna. Just put the cursor on the signal and read the frequency. Not very accurate.|
Soapbox: Never heard W8RKO at all. K5CM was very weak. I need a better antenna. It's still fun. Thanks to Connie as usual.
|Method: IC-706MKIIG with external 30 MHz reference coming from Shera GPS locked oscillator. Spectrum Lab for fine-frequency processing.|
Soapbox: Thanks for the signals and the test. There was no measurement on W8RKO 80-m as the signal stopped after a half minute.
|Method: TCXO stabilized K3 with GPSDO stabilized Siglent 2042x reference injected via K3 receive loop about 600 Hz below FMT call up frequency. Fldigi FMT modem used but did trim the Excel files to select stable part on 80 meters.|
Soapbox: Thanks to K5CM and W8RKO for transmitting the signals. Easy copy on both bands but considerable QRM on 80m with data signals above and below the call up frequency. The fldigi FMT tracking loops were at 10 Hz bandwidth. Almost missed W8RKO's shift to avoid QRM. Noticed W8RKO power dropped down halfway through - Finals Fail? Much fun doing this. Looking forward to the answers! And trying again in the Spring. Thanks Connie and Mike. 73 de tom w7sua
|Method: ICOM IC-7610, Bodnar Mini GPSDO, fldigi in FMT mode.|
Soapbox: University club with many new operators, regrouping after a year off from COVID. Coached a team of complete beginners through the FMT. Fair K5CM 40 meter signal; very weak W8RKO 40 meters.
Similarly fair K5CM on 80; fair W8RKO. Ionosphere seemed stable this evening, and that matched reception of WWV 5 MHz during the half hour before the runs.
Thanks to K5CM and W8RKO for running the show. 73 DE AD8Y, club faculty advisor.
|Method: Icom 7610 + HP58503A|
|Method: I used a Bodnar Mini GPS Reference Clock set near the FMT frequency as an external reference. The external reference is combined using a magic T with switched receive antennas and drives an FT-1000MP. The REF UNIT in the FT-1000MP is my own design that is timed by a second Bodnar Mini GPS Reference Clock. I used FLDIGI 4.1.20 in FMT mode to analyze the audio and output the data vectors.|
Soapbox: The 0230 40 m run and the 0315 80 m run both yielded good measurements, std dev 0.068 Hz and 0.027 Hz respectively. The 0245 and 0300 runs were plagued with both pulsating frequency bumps every 5 to 10 seconds, and slow ionospheric upward drift.
|Method: 160m OCF, SDR, WSJT, Excel|
|Method: FlexRadio 6500 locked to GPS, Denon digital audio recorder, sampling rate error calibrated out with 2 kHz tone from GPS locked HP3325A generator, homebrew GNU Octave code calculates envelope weighted average frequency.|
Soapbox: K5CM weak on 40 meters on west coast, other three signals were good. W8RKO key-down tone disappeared after about 30 seconds on 80 meters.
|Method: FLEX 6700; FLDIGI (Frequency Analysis)|
Soapbox: My noise floor increased +35 dB just before the W8RKO 80m run.
|Method: Apache ANAN-7000DLE MKII|
FLDigi 18.104.22.168 FMT
Soapbox: No joy on 40M hearing either. Good signal on both for 80M.
17mHz standard deviation on K5CM and 1mHz on W8RKO.
So if Doppler didn't kill me I have high hopes.
|Method: Used CW mode. Compared 600Hz tone to 600Hz from audio generator using a scope.|
Soapbox: 40 Meter signals were in the mud. 80M signals were better.
|Method: G5RV with a FLEX 3000 feeding FLDIGI. Used excel and Matlab to process. Measured WWV before and after and took averages to correct frequency in post processing.|
Soapbox: Thank you for doing this. Forced me to get my new computer running with FLDIGI and was fun to figure out what happened. I could only hear K5CM, nothing from W8RKO and WWV at 10M vanished after the 80m test.
|Method: Icom-7300 calibrated to WWV (+-) .25hz. Using a Bodnar GPSDO reference signal. Record test signal data using FLDIGI FMT mode, then run batch program internal to FLDIDI to calculate the recorded FMT Freq. Eliminate data outliers.|
Soapbox: Spent hours learning and testing FMT using my ham radio equipment and the FLDIGI APP with WWV and local radio stations to perform an FMT. I almost missed W8RKO FMT signal on 80M when he moved 1.3khz below my bandpass settings, I will have to view a larger FMT bandpass next time. Thank you, Connie, and Michael, for setting up this event. I look forward to this FMT each year and I would enjoy having FMT quarterly for practice runs that would keep the dust off the user, the station setup and the FMT procedures. 40m signals were weak here in NC, I had a high noise level on both bands (S8-S9) on a 80m wire loop. The 80M signals were very strong but I did have severe QSB in the bandpass. There was digital mode operation around the FMT areas.
|Method: 80 M dipole. 3686B SLM|
Soapbox: W8RKO to weak to copy on 40 M. That line of storms West of VA was rough.
|Method: QRP Labs direct conversion receiver with quadrature sampling detector, Leo Bodnar GPSDO as master oscillator, polyphase network, 7th order elliptical low pass filter, horizontal loop antenna.|
Soapbox: I could not hear K5CM on 40m. Otherwise, signal strength was adequate.
Thanks to Connie, Michael, and ARRL for making this event possible.
|Method: Receiver: Icom R-8600|
Antenna: SteppIR DB-36 option at 70 ft - used 40m setting for both bands
GPSDO: Jackson Labs Fury
Software: Fldigi 4.1.08
Used GPSDO as external frequency reference for R-8600.
Averaged Fldigi measurements during key-down period.
Soapbox: Thanks to K5CM, W8RKO and the ARRL.
|Method: GPS disciplined oscillator referencing a signal generator compared to off air signal using Spectran on PC.|
Soapbox: Learning that the math is the part to remember when comparing signal frequencies. K5SC S9+ on 40 and S5-8 on 80. W8RKO S0-1 on 40 and S5-8 on 80. Not a lot of doppler this round. W8RKO went dead abruptly on 80, did he blow something out? Fun stuff!
|Method: Kenwood TS-2000, HF6V vertical, Spectrum Lab Software.|
Soapbox: No time to calibrate so it'll be interesting to see the results.
|Method: ICOM IC7200, NVIS Antenna at 5 feet, FLDIGI 4.1.15; HP Computer running Windows 10|
Soapbox: Missed first 40 mtr run then put frequency for entry in wrong box for second test. I did have fun and enjoyed the test. Also updated my radio's frequency offset via WWV.
THIS IS THE NEW ENTRY
|Method: SOCFD ant, Flex6400 radio, GDO 10MHz reference, WSJT-X freq cal mode, HP3336B synthesizer|
Soapbox: It appeared to me that W8RKO dropped the carrier early on his 80M run.
Fldigi in Frequency analysis mode
Soapbox: Generally good signals from both stations. There was some QSB on 80m. The highlight of the run was on 80m where about 30 seconds into the key down run W8RKO transmission just quit.
Inject a reference frequency signal into the antenna feed line. Measure the audio frequency difference between the unknown signal and the reference signal frequencies with DL4YHF's Spectrum Lab software.
HF2V, FT-920, SignaLink USB, DG-1022, homebrew GPSDO
Soapbox: Thank you K5CM and W8RKO
|Method: GPSDO OpenHPSDR Mercury with CHU/WWV Cal and FLDigi|
Soapbox: Thanks for running this!