Results - April 8, 2022 FMT
|Actual Radio Frequencies (Hz):|
K5CM or W8RKO (<=1.0 Hz):
AA6LK, AB4RS, AF9A, AJ4YA, AJ5P, K0WM, K5CM, K5RKS, K6FOD, K6LL, K7NG, K8DJR, KA1BQP, KA8BRK, KB2HSH, KB3HF, KD2BD, KD8RV, KE6ZLX, KM1P, KN1H, N5HIM, N7UTE, N7WS, N8TW, NK5B, VE2IQ, VE3OAT, VE3YX, VE6GRT, W1HB, W1QG, W2FD, W3JW, W4EDX, W4IVF, W4JLE, W4VU, W5LAC, W7SUA, W8WTS, W9GR, W9INE, W9MDB, W9TN, WA5UCW, WA7BNM, WA7X, WB2CMF, WB8TFV, WD4EGF, WD4IYE, WQ8T, WS3W
K5CM 80 (<=1.0 Hz):
AA3I, AA6LK, AB4RS, AF9A, AJ4YA, AJ5P, K0WM, K2LYV, K5CM, K5RKS, K6FOD, K6LL, K7NG, K8DJR, KA1BQP, KA8BRK, KB3HF, KD2BD, KD5FX, KD5HIP, KD8RV, KE6ZLX, KM6QX, KN1H, N1IRO, N5HIM, N7UTE, N7WS, N8LR, N8TW, NF7R, NK5B, NW9H, VE2IQ, VE3GSO, VE3OAT, VE3YX, VE6GRT, W1HB, W1QG, W2FD, W3JW, W4IVF, W4JLE, W4RYF, W5AJ, W5LAC, W6DSR, W7SUA, W8EDU, W9GR, W9INE, W9MDB, W9TN, WA1SXK, WA5UCW, WA7BNM, WA7X, WB8TFV, WD4EGF, WD4IYE, WQ8T, WS3W
K5CM 80 (>1 to <=5 Hz):
K1MU, K6AVP, KD5MMM, KG0HY, KG5RMJ, W0HBK, W8WTS, W9ZB, WB4DFW
K5CM 80 (>5 to <=10 Hz):
K5CM 40 (<=1.0 Hz):
AA3I, AA6LK, AB4RS, AF9A, AJ4YA, AJ5P, K0WM, K5CM, K5RKS, K6FOD, K6LL, K7NG, KA1BQP, KD2BD, KD5HIP, KD8RV, KE6ZLX, KG0HY, KM6QX, KN1H, M0MTQ, N1IRO, N5HIM, N5KAE, N7UTE, N7WS, N8LR, N8TF, N8TW, NK5B, NW9H, VE2IQ, VE3OAT, VE3YX, VE6GRT, W1HB, W1QG, W2FD, W3JW, W4IVF, W4JLE, W4RYF, W5LAC, W6DSR, W7SUA, W8EDU, W8WTS, W9GR, W9INE, W9MDB, W9TN, WA5UCW, WA7BNM, WA7X, WB3JFS, WB6HYD, WB8TFV, WD4EGF, WD4IYE, WQ8T, WS3W
K5CM 40 (>1 to <=5 Hz):
K2LYV, K8DJR, KA8BRK, KD5MMM, VE3GSO, W0HBK, W9ZB
K5CM 40 (>5 to <=10 Hz):
K5CM 30 (<=1.0 Hz):
AA6LK, AB4RS, AF9A, AJ4YA, AJ5P, K0WM, K5CM, K5RKS, K6FOD, K6LL, K7NG, K8DJR, KA1BQP, KA8BRK, KD2BD, KD8RV, KE6ZLX, KM1P, KN1H, N5HIM, N5KAE, N7UTE, N7WS, N8TW, NK5B, VE2IQ, VE3GSO, VE3OAT, VE3YX, VE6GRT, W1HB, W1QG, W2FD, W3JW, W4IVF, W4JLE, W5LAC, W7SUA, W8WTS, W9GR, W9INE, W9MDB, W9TN, W9ZB, WA1SXK, WA5UCW, WA7BNM, WA7X, WB6HYD, WB8TFV, WD4EGF, WD4IYE, WQ8T
K5CM 30 (>1 to <=5 Hz):
K1MU, KD5FX, KD5HIP, KD5MMM, N1IRO, N8ME, NV3C, NW9H, W0HBK, W8EDU, WS3W
K5CM 30 (>5 to <=10 Hz):
K2LYV, KG5RMJ, NF7R, W4RYF
W8RKO 80 (<=1.0 Hz):
AF9A, AJ4YA, AJ5P, AJ6T, K2LYV, K5CM, K8DJR, KA1BQP, KA8BRK, KB2HSH, KB3HF, KD2BD, KD5MMM, KD8RV, KE6ZLX, KM1P, KN1H, N5HIM, N7UTE, N7WS, N8LR, N8ME, N8TW, NK5B, VE2IQ, VE3OAT, VE3YX, W1HB, W2FD, W3JW, W4EDX, W4IVF, W4JLE, W4RYF, W4VU, W5AJ, W5LAC, W7SUA, W8WTS, W9GR, W9TN, WA5UCW, WA7X, WB2CMF, WB4DFW, WB8TFV, WD4EGF, WD4IYE, WQ8T, WS3W
W8RKO 80 (>1 to <=5 Hz):
KG5RMJ, NV3C, NW9H, W0HBK, WA7BNM
W8RKO 80 (>5 to <=10 Hz):
W8RKO 40 (<=1.0 Hz):
AA3I, AB4RS, AF9A, AJ4YA, AJ5P, K0WM, K5CM, K6LL, K8DJR, KA1BQP, KA8BRK, KB2HSH, KB3HF, KD2BD, KD5HIP, KD8RV, KE6ZLX, KM1P, KM6QX, KN1H, N3FG, N7UTE, N7WS, N8TF, N8TW, NK5B, NV3C, NW9H, VE2IQ, VE3OAT, VE3YX, W1HB, W2FD, W3JW, W4EDX, W4IVF, W4JLE, W4VU, W5AJ, W5LAC, W7SUA, W7YG, W8EDU, W8WTS, W9INE, W9TN, W9ZB, WA5UCW, WA7BNM, WB2CMF, WB8TFV, WD4EGF, WD4IYE, WQ8T, WS3W
W8RKO 40 (>1 to <=5 Hz):
AA6LK, K1MU, K2LYV, KD5MMM, M0MTQ, N1IRO, N8ME, NF7R, W0HBK, W1QG, W6DSR, W9GR, W9MDB, WA7X, WB6HYD
W8RKO 40 (>5 to <=10 Hz):
AJ6T, KD5FX, KG5RMJ, N8LR, W4RYF
W8RKO 30 (<=1.0 Hz):
AA3I, AA6LK, AB4RS, AF9A, AJ4YA, AJ5P, K0WM, K5CM, K5RKS, K6LL, K8DJR, KA1BQP, KA8BRK, KB2HSH, KB3HF, KD2BD, KD5HIP, KD5MMM, KE6ZLX, KM1P, KN1H, M0MTQ, N1IRO, N3FG, N5HIM, N7UTE, N7WS, N8LR, N8TW, NK5B, VE2IQ, VE3YX, VE6GRT, W1HB, W2FD, W3JW, W4EDX, W4IVF, W4JLE, W4RYF, W4VU, W5LAC, W6DSR, W7SUA, W7YG, W8EDU, W8WTS, W9INE, W9MDB, W9TN, WA1SXK, WA5UCW, WA7BNM, WA7X, WB2CMF, WB6HYD, WB8TFV, WD4EGF, WD4IYE, WQ8T, WS3W
W8RKO 30 (>1 to <=5 Hz):
K1MU, KD5FX, W0HBK, W1QG, W9ZB
W8RKO 30 (>5 to <=10 Hz):
Soapbox: Enjoying ham radio. Fun challenge. Some weak signal reception, QSB, and QRM.
|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 for a sanity check.
Soapbox: Tnx Michael and Connie for running the event once again. Generally poor signals all around; not sure what I heard was W8RKO_80M, but measured it anyway. Hopefully I made no transcription errors like last time.
|Method: Received using HP3586B locked to 10 MHz GPSDO. Sampled and analyzed the audio IF from the HP3586 using SpectrumLab. In addition, used my HP3336C frequency generator to generate a signal compared to the IF signal using oscilloscope, modifying the generated frequency until the traces match relative to each other.|
Soapbox: Signals were generally strong into northern Virginia. A few oddities on some of the signals, where there was a very strong and stable component, but other components tended to spread and meander about. Also, my sound card was somewhat unstable, shifting by a Hz or so sometime during the evening. Hope I made my calibrations at the right time and it was accurate enough.
|Method: Open HPSDR Mercury freq reference calibrated to WWV, CHU. WSJT-X Freq Cal mode.|
Soapbox: Thanks, guys for another good FMT! W8RKO's 30m signal was only about 10 dB above the noise here. We're too close. All other signals were great at least S9+10dB or more.
|Method: Used K3s and the spot feature. Antennas were fan dipole for 40m and 30m, and end-fed wire for 80m. Frequencies were corrected for tuner error.|
Soapbox: As always, I enjoyed this. Thank you.
|Method: IC-705 and FL-Digi|
Soapbox: Good signals except K5CM on 30 m, heard on back scatter.
|Method: K3s in CW Reverse mode compared to WWV at 20 MHz to establish a calibration factor. K3s is supposed to be zero beat when the CW tone is 400 Hz. I tuned each carrier for a 400 Hz tone on the WSJT-X waterfall. The WWV calibration factor was applied to the K3s readings.|
Soapbox: The last time I participated in a FMT was back in the 1970s. At that time I used a frequency counter borrowed from work to measure the three oscillators in my Heath SB303 receiver. This time I started too late to setup a good calibration system, and I relied on a measurement of the K3s offset from WWV at 20 MHz and the WSJT-X 400 Hz marker on its waterfall display. I only made measurements on W8RKO on 40 meters and 80 meters since his signal here in Tennessee on 30m was not audible. I had other commitments that evening so I was not able to listen for K5CM. I'm not expecting a very accurate result, but it sure was fun to participate in the FMT. I'll have a more sophisticated technique next time. 73, Walt, AJ6T
|Method: Measure receiver audio frequency in the CW mode for the unknowns, WWV, CHU or a GPSDO standard. Use homebrew Excel spreadsheets to calibrate the receiver, correct for drift and calculate the unknown frequencies. I have used the spreadsheets for several FMTs, with varying degrees of success. :-)|
Soapbox: Strong steady signals for both stations on 30 and 40 m. There was a lot of QSB on 80 m. Frequency variation on 80 m was about twice the variation on 40 m. Thanks to Connie and Michael for continuing to support this interesting event.
|Method: BG7TBL GPSDO, IC-7610. fldigi for measurements.|
Soapbox: This is my first try at this. The GPSDO is known to be accurate and stable, but I now realize a frequency agile reference would allow better results. The big mistake for me was that fldigi doesn't retain the wav file recording settings so I didn't get captures. Next time!
|Method: Use Fldigi FMT without reference. Correct using WSJTX freq cal parameters.|
|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 (200w on 30m). 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's signals were strong and easy to copy on all three bands. As I have mentioned before, strong signals does not mean Doppler is not present. Mike was a couple of kHz higher than expected on 80 meters, but was found quickly with no problems.
RX: K3 in AM mode with low side injection from a GPS locked HP-3336B. Audio is feed to Spectrum lab.
|Method: I used homebrew software which implements a spectral display. The display shows the signal from the FMT station and also an injected signal from an HP3336B. The HP3336B uses external 10Mhz time base which comes from GPS derived frequency standard. I look at all of the FFT bins making up the spectral display and choose the one with the most energy. My FFT bin size is 0.12207 Hz per bin. Sample rate of audio from receiver is 8000Hz. Number of samples per FFT is 64K.|
Soapbox: K5CM signals were about S5. I did not see even the slightest trace of W8RKO signal on either 80m or 40m. The bands have been much better the last month or so. I guess the solar cycle is helping propagation on the HF bands such as 17m, 15m, and 12m. However, propagation was marginal on 40m and 80m.
|Method: ANAN 100B/Thetis, 10MHz GPSDO, FLdigi FMT, vert+horz receive loop|
Soapbox: Missed the first run and second run 30m.
|Method: HP3586B receiver and HP3336B signal generator (both referenced by Trimble Thunderbolt GPSDO), outputting to T922 oscilloscope in XY mode.|
Soapbox: Thanks for another interesting event!
|Method: Elecraft K3 with Spectrum Lab software.|
Soapbox: For some reason, I find learning about this process fascinating, and I wish there were more opportunities to practice and get good at it.
|Method: IC-7610, 43' vertical, fldigi. 7610 freq error statistically corrected by evaluating thousands of WWV measurements.|
Soapbox: I couldn't hear W8RKO on 30 or 40 at all. I didn't get anything from RKO's 80m run that even remotely resembled decent data. K5CM sigs weren't blowing my doors off but were usable (I think). I'd bet that doing the early run an hour later would benefit us on the left coast a lot as far as having good sigs to work with.
Soapbox: Good signals on all transmissions.
|Method: WJ-8718A locked to Rb standard. Tone measured with Spec-Lab|
Soapbox: Mike's signals were good on all three bands. Connie was strong on 30 and 40, a tad weaker on 80. Significant Doppler this evening. Thanks Connie and Mike.
|Method: Icom IC-706MKII, 80 Meter Inverted V, WSJT-X, WWV, CHU, Excel|
|Method: FT-817ND and fldigi 4.1|
|Method: TS890, Signalink, Computer, FMT software|
Soapbox: Computer quit during K5CM 40m measurement, frequency lost
|Method: All homebrew equipment including a carrier phase tracking receiver, a WWVB referenced frequency standard, frequency counter, and 40 foot end-fed wire antenna. 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 offset. Details at: http://www.qsl.net/kd2bd/fmt-methodology.html|
Soapbox: The Kp-index was 4 and there were thunderstorms in the area. A solar flux of 111 permitted solid copy of W8RKO on 10 MHz this year. In general, W8RKO's signals were stronger with less QSB than K5CM. K5CM's signals suffered the highest deviation in readings (0.325 Hz p-p on 10 MHz) while W8RKO had the lowest deviation (0.075 Hz p-p on 80 meters). Since all homebrew gear was used, simply being able to hear these signals is considered a personal success. 73.000 de John, KD2BD
|Method: FLEX6300 with Bodnar miniGPS Reference Clock. fldigi s/w. Radio calibrated to Bodnar unit on 10100000.|
Soapbox: Signals were kinda weak on 30 meters.
|Method: Butternut HF9V vertical to ICOM IC-756Pro to Rig Expert Standard UBS transceiver interface to MixW V3.2.105 on Windows 10 laptop.|
|Method: FT-857, Speclab, CHU for reference.|
Soapbox: Tried a different rig than I normally use for FMT, we'll see.
K5CM on 30m was tough copy.
73 all ..
|Method: Note WWV or CHU doppler shift prior to keydown. Elecraft K3 listening for call up and initial key down spotting. SDRPlay RSPdx w GPSDO recording to IQ file. Examine IQ file to determine keydown freq utilizing SDRUno software's Synchronous AM demod mode and obtain any sub Hz offset. Add WWV/CHU doppler offset. My resolution is limited to +/- 0.1 Hz. Ant fullwave 80 meter delta loop w plane e-w.|
Soapbox: Could hear W8RKO on 30, but way too far in the noise. Path between Dayton and Detroit and my antenna not quite right at that time of evening!
Very heavy QSB on K5CM's 40 meter keydown and erratic doppler on WWV at same time made compiling that final measurement too much of a guess.
|Method: Nooelec NESDR smart, Ham it up v1.0, Distill am bandstop filter. Mega loop ant MLA-30. GQRX and Fldigi FMT on a HP Intel Xeon linux box. WB0OEW variable frequency RF signal generator providing reference freqs . (REF freq - UNK freq) + REF freq.|
Soapbox: Weak 80m signal assumed to be W8RKO detected. All other signals adequate and measurable into San Diego. Thank you K5CM, W8RKO and ARRL for providing this fun and frustrating exercise.
|Method: First time, for using the SDRplay RSPdx, and a new version of Windows 10. Calibrated SDRplay, with WWV 10MHz. Used an assortment of wire antennas.|
Soapbox: Signals fair to good. This SDR has a very good front end.
Soapbox: It will be interesting to see how close my results were with my very simple set up. I have a lot to learn about frequency measurement. This was fun!
|Method: Used K1VL's KiwiSDR receiver remotely, and did audio analysis with "BestTuner" guitar tuning app on my cell phone.|
Soapbox: Big shout out to George K1IG for coming out to the New England Sci-Tech club in Natick MA and encouraging us to play in FMT. Signals were good from W8RKO, fairly fast ~1 Hz QSB from K5CM/30m over a range of 15 to 20db - overall though Connie was at least 25dB out of the noise even at signal minima. Had an early morning on Friday, so was unable to stick around for K5CM 40/80m.
|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: First 80m transmission was covered by local 3.598 MHz QRM. No evidence of either 30m signal reaching here, 1 and 2 hours before sunset.
|Method: IC-7300 and Spectrum Lab. Computer and radio running since Monday. Calibrated Spectrum lab with WWV 600hz tone and 7300 with WWV and CHU signals near target frequencies. Averaged about 50 samples of each transmission, applied per-band correction and hope for the best!|
Soapbox: Thanks for another fun FMT! Both K5CM and W8RKO 599 on all three bands. Great job!
|Method: HPZ305A GPSDO as reference, Rigol DG1032 sig gen, Yaesu Ft991A receiver in AM mode, SpectrumLab|
Soapbox: Mixed FMT RF carrier with sig-gen carrier at roughly 1Khz higher than FMT. Receiver in AM mode. Resultant audio fed into SpectrumLab for frequency measurement. SpectrumLab using 1Hz GPSDO reference for soundcard calibration. No UK copy on 80/30 from K5CM. Thanks for running once again, good fun!
|Method: KiwiSDR CWN mode, Linux Laptop, Keuwlsoft Audio Freq Counter app on Android phone.|
Soapbox: Can be done without owning a radio! QRM CW conversation right at callup time on W8RKO (80m). Not sure what I was measuring for that run.
|Method: K3, wire vertical, WWV, CHU|
Soapbox: W8RKO covered with QRM on 80M. Again, tnx to both stations for another FMT.
|Method: end fed antenna @ 2m to 3m height, Elecraft KX3, Bodnar GPSDO, FLdigi 4.1.18, Excel|
Soapbox: This was a lot of fun!!! It was my first FMT. Had a few issues like not recording the entire key down, questionable notes, etc. Weak signal on K5CM's 30m transmission. Thank you, very much looking forward to the next FMT! 73, Jeremy N5HIM.
|Method: IC746pro, WSTJX, signalink USB, G5RV antenna. Calibrated 2 hours before measurements started.|
Soapbox: Thanks W5CM and ARRL for another fun evening!!! Good, clear Sigs! 73
|Method: ICOM IC-7000, SignaLink USB soundcard, Spectran software, GPS disciplined frequency generator|
|Method: RX is RF SPace SDR-IQ + SPectraVue software. Known offset reference frequency is Bodnar mini GPSDO injected into SDR input via stepped attenuator and directional coupler. GPSDO adjusted for 600-800 Hz beatnote using AM demodulation in SDR. SDR-IQ I-Q output is recorded for later analysis.|
Analysis is with SDR-IQ playing back recorded file and using AM demodulation to output beatnote to SpectraVue.
Soapbox: I picked up my wife from work but she needed to work late and I pulled into the garage 1 minute before the W8RKO 30-meter transmission. I managed to get a recording but I was so flustered that I set the GPSDO to the 40-meter frequency before writing down the 30-meter offset frequency. (I quickly learned to snap a phot of the screen before moving on) I've estimated it from the recorded file but I could be way off. I did manage to copy all test transmissions but everyone of them was plagued with QRM and/or QSB (multipath-Doppler) For example, I saw 25 dB QSB on K5CM's 80-meter transmission and 1 Hz Doppler was easy to see on the waterfall. This was my first use of the Bodnar mini GPSDO. It's easier to set to a frequency than the dual frequency version but it would be great to be able to have a set of presets ready to send at a press of a "button." Each one of these tests is a learning experience. Thanks, Connie and Michael.
|Method: Kenwood TS-590SG with Mark Goldberg's (W7MLG) TCXO. TCXO adjusted earlier in the day using WWV 15 MHz signal as reference.|
USB feed to laptop running SoundCard Scope.
Zero beat as close as possible, measure beat frequency on scope, determine whether + or -, and add or subtract beat frequency as needed to/from transceiver's displayed frequency.
Soapbox: First time participating in the FMT so please don't laugh! Hope I'm within a few Hz. This was great fun! Hope to participate again sometime.
|Method: IC-7610 recorded .WAV file to SDCard|
Python Script on Mac to read .WAV and do FFT
Soapbox: Dial reading on 7610 was not calibrated.
|Method: Flex 5000a connected to 160 meter off-center dipole. PowerSDR connected to fldigi frequency measurement function.|
Soapbox: It was a very difficult night to measure the frequency of the transmitted carrier. During the 01:03z 30 meter test I had someone tuning up, on the 80 meter test at 01:33z the 80 meter band did not have the propagation to the Seattle area. During the 0203z 30 meter test there was a cw transmission just a few hundred hz away from the signal. Finally the 03:18z 80 meter test was buried in a RITTY transmission. Bot 40 meter transmissions were readable so that I could try my technique.
|Method: Reference Signal Offset Method: Rb/GPS Standard, Fluke 6070A SigGen, FTDX10 Receiver, Multi-band vertical antenna.|
Soapbox: Very strong signals this round. I have more confidence in my K5CM measurements (vs W8RKO) due to tighter variance, esp on 30M.
|Method: IC-7300, Dipole, FLDIGI freq analysis|
Soapbox: missed 30M W8RKO run due to forgetting about it.
Very hurried to play catch-up on the 40 and 80 runs.
Signals were good on all except on the K5CM 80 run due heavy digi QRM
Overall, not a lot of confidence in my measurements, but submitting in the spirit of somebody has to get it wrong, and it might as well be me! 73 NF7R
|Method: Calibrated 50 ppb 10 MHz TCXO external reference of Receiver (RX) set to WWV on 10 MHz just before test. (Cal of reference included WWV Doppler shift.) Tuned in FMT signal using DSB mode with phase display showing dot revolving at 1 revolution per Hz of offset from RX digital frequency dispay value. Tune for slowest rotation of dot and time remaining revolutions to determine offset from RX digital display value. RX was Anan 7000DLE SDR.|
|Method: IC-7300, FLDigi, GPSDO referenced HP3336|
Soapbox: Good strong signal on fldigi waterfall, but the graph would shoot up or down a Hz or so during key down. Ref signal stayed steady. Best guess for throwing out bad data.
Soapbox: First time. Good copy on all six, but had a few issues with overthinking some things and under thinking others. Should be better prepared next time.
|Method: FT-891 + EFHW for 40m + fldigi +|
|Method: E-Probe -> TS850 (GPS-calibrated clock) -> soundcard, measure audio then calculate RF input freq.|
Soapbox: Strong signals, but spent too much time researching propagation. We will see if this made things better or worse. Every FMT is a new experience. Thanks to all.
|Method: Icom 7610 and spectrum lab, premeasured against WWV and CHU, with very minor frequency errors compensated for (I hope)|
Soapbox: It appeared as if a CW operator was coming on just above K5CM during the callup, but thankfully no real interference. Best conditions in a long while.
|Method: The old-fashioned method of AM receiver listening to audio beat note between target signal and local signal generator controlled by GPS-disciplined oscillator. Audio beat note from receiver measured by SpectrumLab software.|
Soapbox: Another challenging theatre production (experiment) with unpredictable appearances by the Famous Mr. Murphy and the Evil Doctor Doppler. Many thanks to K5CM and W8RKO for providing the stage and the main protagonists (signals), and for managing this production. Hope I was able to figure out at least some of the clues to this multi-part mystery!
|Method: TS-870 with Bodnar GPSDO replacing the int. ref. osc. FLdigi in FMT mode.|
Soapbox: All 6 signals were strong. Spectrum Lab showed lots of spread and runs on WWV showed frequency offsets of up to 1 Hz. No telling what the Doppler would be on the FMT signals, so I made no attempt to compensate. I just have to hope that Doppler was kind to me at key down times! Thanks again Connie and Mike.
|Method: SDRduo Receiver / SDRUno software with homebrew audio frequency analysis. Calibrated to WWV 10 and 5 Mhz|
Soapbox: Thanks again for the FUN excercise. Missed W8RKO 40m due to small search window, 80m faded before key down, but got estimate from call up. K5CM had great signals, but 80m was hammered by digital QRM, thanks for holding the key a little extra time!
|Method: Yaesu FTdx3000 direct measurement.|
Soapbox: All signals 59+ in Cedar Rapids, IA
|Method: Kenwood TS-990 with GPS clocked time base. Used WSJT-X in frequency cal mode to average frequency after calibration of software/radio.|
Soapbox: Could not hear the K5CM 80m call-up frequency for measurement.
|Method: ANAN 7000DLE, WWV, MixW|
|Method: MATLAB control of HP 3586B via GPIB |
PC Audio processing of same using Simulink.
Soapbox: No hint of a signal from W8RKO on 80m.
K5CM had heavy QRM on 80m.
Soapbox: Thanks to Mike and Connie for a good workout! Lots of noise on the bands with Mike's signal being weak on 30 meters but all the signals were readable and quite strong on the other bands.
|Method: IC7610 with hi-stability local reference (not GPSDO) into Spectrum Lab|
Soapbox: All transmissions were well above my local band noise. During early run W8RKO was S9+5db on 30M, S9+20db on 40M and S9+20db on 80M. For the late run, Connie was S9+10dB on 30M, S9+20dB on 40M and S9+15dB on 80M. Doppler and multipath were most noticeable on the late run transmissions.
|Method: IC-7610, GPS 10 Mhz Reference, Spectrum Labs SW|
Soapbox: Great signals from W8RKO. 30 Mtrs some QRM but 479, 40 and 80 Mtrs both 599. Thanks for a fun FMT run. Bernie/W4EDX
|Method: GPS phase-locked reference injected into receiver input. Frequency delta measured with Spectrum Lab software.|
Soapbox: Thanking all who make this possible.
|Method: Modified ATS-20 receiver with Arduino GPS Disciplined oscillator. This was an exercise to see how close I can come with a $78 total investment. USB audio was measured with SB spectrum.|
Soapbox: Thanks to K5CM and W8RKO for your efforts, Both stations had great signals into South Carolina. You kept me busy, make a measurement, watch the Braves opening day, Rinse and repeat... HiHi
|Method: Icom7610, 350 ft loop ant, Signal Link sound card, running BPSK from MixW s/w app. Calibrated waterfall against WWV and CHU. Radio then tuned to reference freqs and applied difference between 600hz BFO calibration tone to transmitted signal , subtracted difference. Had difficulty with W8RKO 40 and 80 meter signals and K5CM 30 meter signal.|
Soapbox: Haven't participated in several years. Had to relearn some skills. Thanks for the opportunity.
|Method: HP3586B with surplus Trimble Navigation 10 MHz oscillator calibrated to WWV on 5 MHz. Antenna - internal house wiring I think. Took about 20 observations during 30/40M transmissions and visually took median values. 80M - found it with only a few seconds left.|
Soapbox: Made mistakes; antenna not connected and found 80M signal with only a few seconds to get a reading. Fun anyway! Thanks Connie and Mike!
|Method: K3 and Spectrum Labs Audio software. External $15 sound card|
Soapbox: DQRM, handwriting flaws, minimal rig warm up (rig change out), no practice session. All makes for interesting challenge!
|Method: FLEX-3000 calibrated with GPSDO. LSB mode, tune for 500 Hz beat read with Spectrum Lab software.|
Soapbox: Thanks to ARRL, W8KRO and K5CM for a fun event !
|Method: Thanks for running a fun contest.|
Coherent receiver locked to GPS reference into an 11 digit counter. Data collection and analysis via PC.
Soapbox: W8RKO 80m signal was very weak here on the left coast, -114 dBm --> -112 dBm with the noise at -118 dBm. That frequency is pretty much a guess.
The K5CM 80m signal was right on top of a digital transmission at my QTH. Am I the only one who heard that?
|Method: Yaesu FT DX 1200 and FLDIGI|
|Method: Elecraft K3 with TXCO then used fldigi's FMT modem with an injected GPSDO stabilized ref tone from a Siglent SDG2042X which took care of my K3's absolute error of about 1 Hz. Two element beams on 30 and 40 pointed ENE. 160m OCF Inv V on 80m. This time used SpectrumLab in parallel looking at 10 Hz around each FMT signal after shifting center to the key down frequency as a sanity check.|
Soapbox: Always fun to see how the ionosphere distorts clean transmitted signals. And to discern the target signal with various digital modes QRM on top of them. The Olivia 16/1000 on Connie's 80m signal did not cause a problem and I was able to decode that net. Thanks Connie and Mike for running the FMT yesterday. Used SpectrumLab with span of 10 Hz to look at each target signal. Could see how much Doppler spreading and multipath was on each of the target signals. Great fun!
|Method: Anritsu Spectrum Analyzer|
Soapbox: First FMT. I didn't make enough notes during the run to be sure my arithmetic afterwards is accurate. Looking forward to the next FMT and making more/better notes.
Soapbox: K8TUN, KC3OAH, KE8TBG, AD8Y. A fairly "green" team but we had fun. We did miss one transmission altogether...W8RKO was weak here in northeast Ohio. K5CM's 40 meter transmission had strong flutter at about 2 Hz, multipath transmission? Thanks to all concerned for putting this together and keeping it going. DE THE W8EDU CREW
|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 in FMT mode to analyze the audio data vectors.|
Soapbox: I heard good signals from both stations on all three bands.
|Method: FlexRadio 6500 locked to Trimble GPSDO, Denon SD card digital recorder. HP3325A also GPS locked provides 2 kHz tone to opposite stereo channel to measure Denon sampling rate error. Sox resamples 44.1 to 8 kHz, homebrew GNU Octave code reads WAV file, filters and measures average tone frequency weighted as a function of received envelope.|
Soapbox: I missed the first W8RKO transmission on 30 meters. I looked at the clock and it was 6:05 PM PDT. Snagglefrazzit! But I got everything fired up in time to do the rest of the measurements. W8RKO was weak on 80 meters, an hour before sunset on the west coast.
|Method: FLEX-6700 & FLDIGI "FREQ ANALYSIS" mode.|
Soapbox: All Signals were good. S/N ranged 45dB to 65dB. K5CM was strongest at my QTH.
Soapbox: Missed W8RKO 80M, K5CM 30M was extremely weak so not sure about the answer at all.
|Method: Tried a new approach. Recorded IC-7610 RF spectrum with HDSDR and played back IQ data into vector signal generator. Radio and signal generators GPSDO referenced.|
Soapbox: Thanks Mike and Connie!
Soapbox: W8RKO 80M sig QRM'd by a strong CW signal which threw me off long enough to not get readings.
|Method: Icom-7300 using Bodnar GPSDO reference signal. Record test signal data using FLDIGI in FMT mode. Eliminated data outliers.|
Soapbox: Missed W8RKO 40m due to loss of my ref. signal OP error. 80m W8RKO was not heard here on east coast. 40m K5CM kept fading prevented me from locking on his signal. I might have had the signal to near the edge of tracking (+-10hz) to the 10hz allowed in FLDIGI to lock on. I noticed lots of doppler this year, I had some doppler swings as high as .800hz, which made this years FMT difficult.
|Method: Direct conversion receiver with quadrature sampling detector, Leo Bodnar GPSDO as master oscillator, polyphase network, 7th order elliptical low pass filter, horizontal loop antenna.|
WSJT-X v2.1.2 in Freq Cal mode to log FMT data. Used WWV, CHU, other reference stations for calibration.
Soapbox: Noted higher than usual point-to-point frequency variation, particularly during the W8RKO runs.
Great fun as usual - 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 40m and 80m
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: W8RKO 80m signal was not copyable in S.Calif. Measured a signal that was in the noise, but couldn't confirm that it was W8RKO's. 0130Z is too early for an 80m FMT in April for stations on the West Coast. Local sunset was at 0218Z.
|Method: GPS disciplined HP signal generator for reference, TS-2000 receiver, Full size loop for 30 and 80, Tribander with 40 meter dipole. PC with Spectran|
Soapbox: Noise floor so low on all bands that I thought my antennas were disconnected or the receiver died, but no, signals were great. anywhere from S5 to 10 over 9. Noted minor doppler on both 40 meter signals. K5CM's 80 meter was clobbered by some digital signals, but divined the carrier out of the interference. Noticed an AM voice signal came up on the 40 meter W8RKO for 10 seconds or so, but no issue.
|Method: Spectrum lab HP3586, 80m dipole|
Soapbox: Been a while since I tried this.
|Method: Kenwood TS-2000, Cushcraft R8 Vertical for 40 and 30 Meters, End Fed Dipole for 80 Meters, HP Desktop intel i7, Rigblaster PC Interface, Fldigi software in frequency analysis mode.|
Soapbox: Conditions were good on all bands. A lot of QSB on 40 and 80. New PC being used this time so not sure of results. I had fun no matter what the outcome is. Thanks to K5CM W8RKO for their FMT efforts.
|Method: Kenwood TS-2000, Spectrum Lab software. Calibrated using both WWV at 5.0mHz and CHU at 3.33mhz.|
Soapbox: Both 40 and 80 meter signals from K5CM at 59+10 in NV. At the start of the 80 test, some severe interference nearly wiped out the signal. Not sure if it was local or not.
|Method: Kenwood TS-480HX calibrated against WSJT-X|
Soapbox: Left the radio on for more than a week to ensure stability. Good signals on all runs and great fun!
|Method: dipole, Flex 6400, WSJT-X in freq cal mode, GPS disciplined oscillator, HP 3336B synthesizer.|
Soapbox: I did not see the 80M signal from either station. What happened? 30 and 40 were strong enough to make a measurement.
|Method: GPS clock, Spectrum Lab, LibreOffice Calc|
Soapbox: Thanks for the fun
|Method: Flex 6600 xcvr clocked with a Leo Bodnar GPSDO. Flex DAX feeds audio to Spectrum Lab software. Configured SLab fft and sample rate for best freq resolution per bin verses time for peak freq readings of approx. 1 per sec. Avg'd peak output values and adjusted against closest WWV/CHU doppler freq. immediately after each FMT. I Also threw out the max and min readings measured before averaging. Hope I'm somewhat close! 73, Don|
|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. Take the stable reference frequency 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. Thanks to Connie and Mike for their time and equipment. Both S9 on 40M and 80M using end fed antenna. Mike is 2 miles away so 30M was in the noise bu Connie was S9.|
Soapbox: I missed he last two FMT tests and actually and to hurry to do this. Thanks Connie and Mike for your time and the fun!
HF9V and 30M dipole antennas, an HP 3586C with a 10 MHz external reference from a GPSDO, and a computer running DL4YHF's Spectrum Lab software to analyze the IF output of the HP 3586C.
SpecLab is used to determine the frequency of the peak IF signal from the HP3586C. The change of this value from 15.625 kHz is subtracted from the HP 3586C frequency setting to determine the received frequency. The sound card is calibrated using SpecLab’s continuous calibration using a 10 kHz reference signal.
Soapbox: Thank you K5CM and W8RKO.
|Method: GPSDO Referenced OpenHPSDR Mercury with 2nd GPSDO calibration check with in band signal. SpectrumLabs process offline for final numbers.|
Soapbox: Thank you K5CM and W8RKO!