Results - April 21, 2023 FMT
|Actual Radio Frequencies (Hz):|
K5CM,W8RKO All (<=1.0 Hz):
AA3I, AA6LK, AB4RS, AC9LV, AD7G, AF9A, AJ5P, K0MZ, K3CDY, K5CM, K8DJR, KA5MGL, KD2BD, KD5FX, KD5HIP, KD5MMM, KD5XB, KD7KDO, KD8RV, KE0NRE, KE6ZLX, KN1H, N3FG, N7QXB, N7WS, N8LR, N8OBJ, VE2IQ, VE3CXB, VE3GSO, VE3OAT, VE3YX, W1HB, W2TX, W3JW, W4EDX, W4IVF, W5AJ, W5LAC, W7SUA, W8AEF, W8EDU, W8GNM, W8WTS, W9FLA, W9GR, W9INE, W9MDB, W9TN, WA5UCW, WB6HYD, WD4IYE, WQ8T
K5CM 80 (<=1.0 Hz):
AA3I, AA6LK, AB4RS, AC8QX, AC9LV, AD7G, AF9A, AJ5P, K0MZ, K0WM, K3CDY, K5CM, K5RKS, K6LL, K8DJR, KA1BQP, KA5MGL, KA8BRK, KB3HF, KD2BD, KD5FX, KD5HIP, KD5MMM, KD5XB, KD7KDO, KD8RV, KE0NRE, KE6ZLX, KG6T, KJ4RWD, KJ6HYC, KJ7E, KK4KAZ, KM6QX, KN1H, N3FG, N5LUL, N7QXB, N7WS, N8LR, N8ME, N8OBJ, N9BPL, N9DK, VE2IQ, VE3CXB, VE3GSO, VE3OAT, VE3YX, W0DAS, W1HB, W2FD, W2TX, W3JW, W4EDX, W4IVF, W5AJ, W5LAC, W6BM, W6DSR, W7SUA, W8AEF, W8EDU, W8GNM, W8WTS, W9FLA, W9GR, W9INE, W9MDB, W9TN, W9ZB, WA1SXK, WA5UCW, WA7BNM, WA7X, WB6HYD, WB7ABP, WD4IYE, WO7V, WQ8T, WW1RF
K5CM 80 (>1 to <=5 Hz):
KO6YG, N6YEL, W3FAY, W7GW, W7KPZ
K5CM 80 (>5 to <=10 Hz):
K5CM 40 (<=1.0 Hz):
AA3I, AA6LK, AB4RS, AC3IS, AC9LV, AD7G, AF9A, AJ5P, K0MZ, K0WM, K3CDY, K5CM, K5ND, K6LL, K8DJR, KA1BQP, KA5MGL, KB3HF, KC6WFU, KD2BD, KD5FX, KD5HIP, KD5MMM, KD5XB, KD7KDO, KD8RV, KE0NRE, KE6ZLX, KI0LS, KJ4RWD, KJ7E, KK4KAZ, KN1H, M0MTQ, N3FG, N5LUL, N7QXB, N7WS, N8LR, N8OBJ, N9DK, VE2IQ, VE3CXB, VE3GSO, VE3OAT, VE3YX, W1HB, W2FD, W2TX, W3JW, W4EDX, W4IVF, W5AJ, W5LAC, W5SSV, W6BM, W6DSR, W7SUA, W8AEF, W8EDU, W8GNM, W8WTS, W9FLA, W9GR, W9INE, W9MDB, W9TN, W9ZB, WA1SXK, WA5UCW, WA7X, WB6HYD, WB7ABP, WD4IYE, WO7V, WQ8T, WW1RF
K5CM 40 (>1 to <=5 Hz):
KA8BRK, KJ6HYC, N6YEL, N9BPL, W3FAY, W7GW, W7KPZ, WB2CMF
K5CM 40 (>5 to <=10 Hz):
W8RKO 80 (<=1.0 Hz):
AA3I, AA6LK, AB4RS, AC3IS, AC8QX, AC9LV, AD7G, AF4ZE, AF9A, AJ5P, K0MZ, K0WM, K3CDY, K5CM, K5RKS, K8DJR, KA5MGL, KA8BRK, KD2BD, KD5FX, KD5HIP, KD5MMM, KD5XB, KD7KDO, KD8RV, KE0NRE, KE6ZLX, KG6T, KJ6HYC, KJ7E, KM6QX, KN1H, N3FG, N5LUL, N7QXB, N7WS, N8LR, N8OBJ, N9BPL, N9DK, NN4RB, SP5LST, VE2IQ, VE3CXB, VE3GSO, VE3OAT, VE3YX, W0DAS, W1HB, W2TX, W3FAY, W3JW, W4EDX, W4IVF, W5AJ, W5LAC, W5SSV, W6BM, W6DSR, W7SUA, W8AEF, W8EDU, W8GNM, W8WTS, W9FLA, W9GR, W9INE, W9MDB, W9TN, WA5UCW, WA7BNM, WB6HYD, WD4IYE, WO7V, WQ8T, WW1RF
W8RKO 80 (>1 to <=5 Hz):
KA1BQP, KB0YDN, N6YEL, N8ME, W7GW, W7KPZ, WA7X, WB7ABP
W8RKO 80 (>5 to <=10 Hz):
KO6YG, W9ZB, WB2CMF
W8RKO 40 (<=1.0 Hz):
AA3I, AA6LK, AB4RS, AC3IS, AC9LV, AD7G, AF9A, AJ5P, K0MZ, K3CDY, K5CM, K5ND, K6LL, K8DJR, KA5MGL, KA8BRK, KB3HF, KC6WFU, KD2BD, KD5FX, KD5HIP, KD5MMM, KD5XB, KD7KDO, KD8RV, KE0NRE, KE6ZLX, KG6T, KI0LS, KJ6HYC, KM6QX, KN1H, M0MTQ, N3FG, N7QXB, N7WS, N8LR, N8OBJ, N9BPL, SP5LST, VE2IQ, VE3CXB, VE3GSO, VE3OAT, VE3YX, W0DAS, W1HB, W2FD, W2TX, W3FAY, W3JW, W4EDX, W4IVF, W5AJ, W5LAC, W7KPZ, W7SUA, W8AEF, W8EDU, W8GNM, W8WTS, W9FLA, W9GR, W9INE, W9MDB, W9TN, WA1SXK, WA5UCW, WA7X, WB6HYD, WD4IYE, WQ8T
W8RKO 40 (>1 to <=5 Hz):
K0WM, KA1BQP, KJ4RWD, KJ7E, N5LUL, N8ME, N9DK, W5SSV, W6DSR, W9ZB, WB2CMF, WB7ABP, WW1RF
W8RKO 40 (>5 to <=10 Hz):
|Method: Kenwood TS-590S with a short vertical dipole. Use WSJT-X in frequency calibration mode and a Trimble GPS receiver for calibration. Use an excel spreadsheet to average data and apply frequency cal corrections.|
Soapbox: Always enjoy the FMT challenge. QSB conditions and sleepy operator making measurements. Much thanks to K5CM and W8RKO.
|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 USBserial|
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, though this time I just used the display as a sanity check.
Soapbox: Signals were relatively strong compared to past events but had much amplitude and phase variations Thanks Connie and Mike for running the event. 73, L-
|Method: HP 3586 Selective Level Meter as receiver, locked to 10 MHz reference from Trimble Thunderbolt. Antenna is 40m EFHW. Recorded and analyzed 3586 IF using SpectrumLab.|
Soapbox: Enjoyable as always. All signals were strong into Northern VA, but showed dual frequency tracks, spread about 0.75 Hz. Added some more guessing into the mix. We will see if my dartboard was accurate.
|Method: Yaesu FTDX 10 using centering signal on waterfall in CW mode|
|Method: IC-706MKIIG, SignaLink USB, Audacity, SpectrumLab|
|Method: SDR Play w/ SDRUNO software|
Soapbox: G5RV with SDR Play. Quite a bit of QRN made things difficult, but had to give it a try. Really enjoy FMT every year.
|Method: Used FTDX3000, GPSDO, and a Freq. Counter.|
Soapbox: Spent more time to get things right hopefully, no rush. Thanks to Connie and the FMT team for putting on this event.
|Method: Simple 20m dipole in attic with E-W beam (because that is what I have!)|
Flex 6300, cal'ed on 15MHz prior to measurement.
WSJT-X running on Win10 laptop
Leo Bodnar GPSDO
Flex 6300, cal'ed on 15MHz prior to measurement.
WSJT-X running on Win10 laptop measuring DF during FMT key down at frequencies 7064, 7065, 3598, 3599 kHz. Logged and saved during FMT key down. Averaged raw measured offset.
Leo Bodnar GPSDO - after FMT, measured radio offsets for GPSDO set to FMT freq's (7064, 7065, 3598, 3599 kHz). Used this offset to correct the raw measurements during the FMT.
All four transmissions were received, WSJT reported S/N which I averaged during over each meas. period:
Freq WSJT S/N
Overall not certain this is a sound measurment method (relies on the GPSDO accuracy and stability, though this seems to be within 0.03Hz of WWV/CHU).
So lots of fun! Like many things for me these days, preparation for this FMT was about 3rd or 4th in the list of things to do (family, work, house chores) - next time I'll forgo house chores!
Thanks to K5CM and W8RKO and everyone for setting this up! 73 AF4ZE.
|Method: OpenHPSDR Mercury Recvr. Reference: OCXO calibrated to WWV/CHU.|
Measurement with WSJT-X, Freq Cal mode.
Soapbox: Thanks for another great FMT! Big signals this time on both bands.
|Method: Flex 6600M with internal GPSDO|
Soapbox: Second Go Round. Got all this time. Will see if I got them
|Method: IC-705, FLDIGI|
Soapbox: A lot of 80m QRN from T-storms in TX, some Doppler shift.
|Method: Flex 6400 using WSJTX Freq Cal mode software.|
Soapbox: First time. I thought this might be interesting.
|Method: Drake TR7 receiver; Icom reference signal into a Heathkit IM-4100 clocked with a HP-10544A OCXO. K5CM 40 meter sig 20 dB over S9, K5CM 80 meter sig S7 with mild QSB, some doppler; W8RKO 40 meter sig 15 dB over S9; W8RKO 80 meter sig S5 with deep QSB|
Soapbox: Tuned audio pitches by ear. At middle of the day the HP-10 MHz OCXO was tuned to WWV. Thank you Connie and Mike for running this FMT this evening. This evening, it was a nice relaxing way to play with radios.
|Method: ts-590, 20m dipole (low and indoors), spectrum lab|
Soapbox: wanted to do this for several years, thanks for running it.
|Method: Set up is a Yaesu FT-1000MP Mark V, 40-meter dipole, Fluke 8845A multimeter as an audio frequency meter. Measured audio frequency with the receiver in the CW mode. The Fluke measures eight values of audio waveform period per second, averages the measurements, and presents the result as average frequency, one per second. Remove measurements more than three standard deviations from the average. Calibrated the receiver with a Bodnar GPSDO. Used homebrew Excel spreadsheet to calibrate the receiver, correct for drift, and calculate the unknown frequencies. I have used the spreadsheet for several FMTs, with varying degrees of success. :-)|
Soapbox: The K5CM-K0WM MUF was 10.8 MHz so 40- and 80-meter signals on this path were excellent. (It’s tough going in November.) The 80-meter signal was strong and steady for both stations. There was about 70% more frequency variation on 40 meters than on 80 meters for both stations. Thanks to Connie and Mike for continuing support of this interesting event.
|Method: Expert Electronics SunSDR2DX hooked to Leo Bodnar Mini GPSDO, 66 FT EFHW at 20FT above ground.|
Soapbox: Used the SunSDR2DX connected to a Leo Bodnar GPSDO for external 10MHz clock reference, running Expert SDR host software (version 1.0.3 beta) with a sample rate setting of 312kHz. Tuned in 1Hz increments to obtain a zero-beat with my CW sidetone, and noted VFO frequency.
|Method: Used my Icom 7300 linked to the computer running FLDigi set to the Frequency Measuring Mode. Calibrated the radio/software using WWV and established a baseline.|
Soapbox: Both stations signals were strong here in Florida but varied rapidly up and down 2 Hz making the measurement of frequencies difficult. Hope my guessing at the frequencies came close. I had a great time though and thanks to both of the operators.
|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 800 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's signals were strong on both bands, but strong signals do not necessarily mean no Doppler. 73, Connie / K5CM
|Method: IC-9100 receiver. WSJT-X Frequency Calibration mode.|
Soapbox: Good signals on 40 meters but couldn't copy 80 meters from either K5CM or W8RKO.
|Method: Injected signal from HP3336B into antenna. Measured HZ spacing between two tones from receiver using homebrew program that implements Fast Fourier Transform. One tone coming from receiver is from the off-the -air signal and the other tone is from the HP3336B. The HP3336B uses external 10Mhz reference.|
Soapbox: Both of K5CM's signals were usable. W8RKO's 40m signal was NIL. W8RKO's 80m signal was about S4.
|Method: Uncalibrated AM receiver, Bodnar GPSDO used as BFO, Spectrum Lab SW to record the resulting tone. Test Freq = GPSDO + averaged tone.|
Soapbox: All four signals were strong and in the clear. I got the Bodnar GPS Mini as a Christmas present, and this was the first time that I used it.
|Method: Icom IC-7300 calibrated with WWV and CHU.|
Used audio beats with 1000 Hz audio generator.
Graphed and calculated results.
Soapbox: All sessions were strong and copyable in Michigan.
|Method: WJ-8718A slaved to Rb standard. Spec-Lab software to measure beat note.|
Soapbox: Lots of doppler yet good signals on both bands. On Mike's two transmissions, I noticed what looked like two different signals. Thanks to Connie and Mike for another great FMT.
|Method: ICOM IC-7100 with 1/2 wavelength wire dipoles at 30 feet.|
FLdigi ver 4.1.26 software
Soapbox: First time to participate. A bit nervous; first timer's jitters, plus thunderstorms in the area just a couple of hours before time. Glad to do it. 73
|Method: IC-706MKII, Homebrew GPSDO, IC-7100, Bodnar Mini GPSDO, 80M Inverted V, WSJT-X, Fldigi, Excel|
Soapbox: Good Signals with some QRN. TNX to all who help with this exercise.
Soapbox: 40 came thundering in with no problems whatsoever.
80 had heavy fading but fair to good conditions otherwise.
My ears aren't what they used to be. within 20 Hz, it was interpolation.
|Method: TS-890.SignaLink, WSPR|
Soapbox: 80M noisy due midwest storms
|Method: Used my TS-2000 to tune in the FMT signal using CW. Then injected a tone within 200Hz from a PTS500 Synthesizer that derives its 10 MHz clock input from a Trimble Thunderbolt GPSDO. The resulting signal was recorded to a .WAV file and that was measured using FLdigi in post processing. Doppler was assumed to be a zero mean for the duration of the Key down time.|
Soapbox: Despite the lack of a good antenna, I had solid copy of all signals. There was some spurious output from my synthesizer for the 80 m runs, so I expect those errors could be larger.
|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: Very strong signals were received from both stations on both bands. The Kp-index was less than 1.5, with greater levels of instability (QSB) observed on 40 than on 80 meters. Luckily, the expected G1 geomagnetic storm was delayed until after the FMT. WWVB was exceptionally strong as well. 73.000 de John, KD2BD
|Method: Method: FLEX6300 (no GPS) with fldigi FMT mode. Calibrated to local Bodnar MiniGPS device.|
Soapbox: On 80 both signals were +20 over S9 with lots of lightning crashes. On 40 both signals were +20 to + 40 over! I like the later time, band conditions were better.
|Method: Butternut HF9V vertical to ICOM 756PRO to Rig Expert Standard to MixW v3.2 for frequency readout.|
Soapbox: Fun, but it is past my bedtime.
|Method: FT847, spreadsheet, CHU for reference|
Soapbox: Many thunderstorms in the area, hope to be close.
|Method: Icom 706 MK2G with CR-282|
60-foot long wire 20 feet off the ground
Soapbox: My first FMT, sure hope I got this right. I had intended to take the fan off the back of my radio (see http://www.ad5x.com/images/Articles/Fan706RevA.pdf) but I could see the frequency going up & down 1-2 HZ in relation to WWV, so I left the fan on and the cool radio seemed to be very stable. The only question is whether it was stable high, low, or on frequency! HIHI!
Signals were good here in eastern New Mexico USA.
|Method: IC-7300 using FLDIGI|
WWV and HP3336B references
Soapbox: Tnks for the fun ... I hope I got closer this time than my last attempt.
W7MOT club -- I hope other club members tried it out as well.
|Method: GPSDO and RSPdx. Used SAM DSB demod and walked the frequency in.|
Soapbox: Nice signals all around. Doppler got a bit unruly on W8RKO's 40 meter signal here at my QTH.
Tried to use some different measurement methods and failed at them. But that's how you learn! Looking forward to getting better the next time!
Thanks to all for providing the challenge.
|Method: Hardware: HP Envy laptop PC, IC-7300, Leo Bodnar GPSDO, 40-meter OCF dipole at 30 feet broadside to the NE.|
Software: FLDIGI in Analysis mode.
Methods: Warmed up all equipment for 4 hrs prior to the event. Calibrated PC soundcard using clock “tics” from 5 MHz WWV signal as described in the FLDIGI manual. Tweeked the IC-7300’s REF adjust setting to roughly calibrate the receiver to the 10 MHz GPSDO signal. Fine-tuned the adjustment further using FLDIGI’s software. Compensated for ionospheric disturbances by recording a 1-min signal from CHU 3.33 MHz and 7.85 before and after each run. Calculated the average value of recorded measurements and compensated for CHU variations.
Soapbox: The ionosphere was more calm at this time of night judging by measured frequency variations from CHU.
|Method: KiwiSDR in North Carolina (KT4RS). USB audio frequency measured on an android tablet with spectrum analyzer by Keuwlsoft. Android phone connected to KiwiSDR and audio tone sent to spectrum analyzer. Frequency set on KiwiSDR plus frequency of measured USB tone equals frequency of received unknown signal.|
Soapbox: Strong signals into NC. I used a different technique this FMT. I was intrigued by Joe KM1P using the KiwiSDR online radio and his results. I contacted Joe and with his advice set up a way to measure the unknowns. Thank you KM1P, KT4RS(KiwiSDR owner), K5CM and W8RKO. Learned something new and really enjoyed the challenge.
|Method: Antenna: OCFD; receiver: SDRplay RSPdx; frequency reference: Leo Bodnar GPSDO; SDR software: SDRuno; recording software: Fldigi in FMT mode using virtual audio cables from SDRuno; analyses: software written in Python. Doppler frequency shift recomputed at each transmitter frequency based on concurrent WWV 5 MHz data. Doppler frequency shift removed from each measurement, which are the averages of the tail ends of each transmission. I still want to try out a different frequency recording software in the future, but I haven't had time since the last FMT. The average recorded Doppler frequency shift was .34 Hz at 5 MHz.|
Soapbox: This is my second time participating in the FMT, but I still had some software issues. The SDR program froze right before the first measurement, resulting in only three measurements being submitted this time. I participated from the University of Arizona shack while teaching a fellow student how to make accurate frequency measurements. All of the signals were quite strong.
|Method: Icom IC 7610, Did 24Hr. temperature soak @ 70F, checked frequency calibration @ WWV 5/10Mhz (no adj. Required). Antenna used, 80M Doublet @ 50Ft. W/Window Line. Set display to 5Khz Span, Mode to "AM", RBW & VBW to "NAR" (for sharpest display), Used the "Call up" to adjust "ATT/"P.Amp" for best display, and took the readings. |
Note: Had QRM on K5CM 40M.
Soapbox: Thanks to both stations and the ARRL for setting up this Frequency Measuring Test.
|Method: Fully warmed up Yaesu FTDX101mp calibrated internal TCXO at 50 MHz feeding FLDigi. Used 15 MHz WWV to calibrate the sound card sample rate clock, used 5 MHz and 2.5 MHz WWV to set the RX offset as close to the measuring time as possible. Recorded the readings in Excel, filtered and averaged the readings.|
Soapbox: Old school, used WWV to calibrate my RX and factor in the Doppler shift offset.
|Method: Kenwood TS-850S Transceiver, Rigol DG-1022 Dual Channel Signal Generator, BG7TBL GPSDO to send 10MHz External Clock Source to Signal Generator.|
Sig Gen generates two GPS accurate frequency markers to bracket target CW signal, and Spectrum Lab audio spectrum data is saved and loaded into Excel spreadsheet to compute statistical frequency estimate of target frequency based on it's relative position between the frequency markers.
Soapbox: Missed only W8RKO 40m test - absolutely ZERO detection of any nearby signal! Other 3 tests were fine with strong signals.
|Method: Used active magnetic loop antenna into a Flex-1500 locked to a 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: I had a problem receiving K5CM's 40m signal, but otherwise strong signals here near San Francisco; around -80 dBm with -120 dBm noise floor, using ground level magnetic loop antenna.
|Method: IC-7300, 150'receiving wire 1' high, Spectrum Lab. Turned on radio and computer Monday night and left the running til the FMT. Checked both against WWV and CHU. Got about 60 samples of each transmission, sorted and disposed of the top and bottom 10%, then averaged the rest. Subtracted that result from the dial reading and hoped for the best!|
Soapbox: Thanks to Connie and Michael for bringing us another fun FMT! Both stations on both bands were 599, terrific signals to work with. Hope the later start was helpful to those out West. 73, John, KN1H
Soapbox: With zero-beat, I recorded K5CM 3.598 MHz as 3.59834 MHz, and I recorded W8RKO 3.599 MHz as 3.59897 MHz
|Method: FT991A, GPSDO, Spectrumlab, Rigol sig gen|
Soapbox: Another enjoyable event thanks team. Strong signal on 40, zero copy on 80 due to local noise
|Method: K3, dipole, Spectran V2, CHU, WWV|
Soapbox: Good copy on all signals. A bit of doppler. Many tnx to both stations for another fun event.
|Method: Yaesu FT-920 x correction factor of .9999965|
Soapbox: Had fun anyway
Soapbox: First time. Had Fun. Lokking forward to another one.
|Method: SDRPlay RSPDuo with Leobodnar GPSDO|
|Method: Bodnar GPSDO through stepped attenuator to directional coupler to SDR-IQ RX input. Bodnar set to ~500 Hz below received signal. Record AM demodulated spectrum via SpectraVue S/W for later analysis. Extract keydown portion of audio with Audacity S/W. Analyze with Spectrum Lab S/W.|
Soapbox: I set my recording file size to capture 4 minutes and start recording at call up. IIRC Connie started early and I thought I was running out of time so restarted the recording, overwriting some keydown portion. I had another problem with W8RKO's 80-meter run, where the recording just stopped midway for some unknown reason. Conditions were rough, noisy signals and Doppler/multipath was a problem on all frequencies, so maybe it didn't matter. I just rounded off to to 0.1 Hz and hope for the best. Next time I will go back to redundant SDR-IQs and computers.
Thanks Connie and Mike for putting on this show. Wish they occurred more frequently.
|Method: Kenwood TS-590SG with W7MLG TCXO, laptop running FLDIGI v4.1.23 FMT mode. Transceiver "warmed up" for 12 hours. Unfortunately my presence in the shack during the test increased the ambient temperature by 0.9 deg F over the course of the calibration procedure and test. I determined "frequency corrections" for FLDIGI FMT using CHU signals at 3.33MHz and 7.85MHz and WWV signals at 5MHz, 10MHz, and 15MHz both before and after the test. Even with a long warm-up and fairly stable ambient temperature, the before and after calibration runs differed a bit. I'm not sure how much of that is due to TCXO drift or Doppler effect or something else. A GPSDO would be nice but I'm more interested in seeing what I can do with a barebones setup.|
Soapbox: This was my first time using FLDIGI for the FMT. All sigs strong and quite stable at my QTH. Thanks Connie and Mike for putting those sigs on the air for us to play with.
|Method: sBitx Transceiver / HP8920 Service Monitor / R8 vertical antenna|
Used a tee to feed the antenna and service monitor output to the transceiver input. Adjusted the service monitor frequency to zero beat the FMT signal by ear. Reported the frequency of the service monitor output.
Soapbox: Operating with Tom Holmes (N8ZM) from the Dayton ARA (W8BI) clubhouse
|Method: Flex6500 with HP Z3801A GPSDO. Used Gap Titan for K5CM and 80M OCF dipole for W8RKO. Used 4 min each of measured WWV Doppler shift on either side of FMT freq and did a linear interpolation (ionosphere is linear right? 8-}} ) of doppler shift applied to FLDIGI V1.18 in Frequency Analysis mode. We'll see how bad this technique is...|
Soapbox: Very clean and clear signal for both K5CM and W8RKO. Ionosphere was more stable than usual (this UTC time [03:00] is MUCH better (settled) for freq msmt. wrt to ionospheric distortion)
|Method: SDRPlay RSPduo with Leo Bodnar GPSDO providing the 24MHz reference. Analysis with Matlab.|
Soapbox: Thanks to all who make this possible. It is a fun challenge.
|Method: Kenwood TS-690 with aftermarket SO-2-like TCXO; Leo Bodnar mini-GPSDO; digirig; fldigi; endfed at 25;|
Soapbox: First time - this is fun. All signals received relatively well; I'm afraid I haven't trimmed my data correctly - I didn't carefully record the key down/up times. I guess we'll see!
|Method: The radio is an ICOM IC7610 that uses an external frequency standard provided by an old Trimble Thunderbolt GPS disciplined 10 MHz. oscillator. WSJT-X software was used in FreqCal mode to create a file of the measured errors. Then the file was run as a spreadsheet to calculate the error and measured frequency.|
Soapbox: This was my first Frequency Measuring Test and I had hopes for better performance. My preliminary testing using the time and frequency standards of WWV and CHU produced good results. However, when the real test started, it quickly became apparent that I was not going to be happy with my results. The K5CM 40M test produced 1 acceptable measurement in 24. The W8RKO 40M test was worse with no good measurements. I noted that I could hear the frequency warbling, and I contributed that to the doppler effect. Next came the K5CM 80M test. Again, there was no good measurements taken as indicated by the s/n ratio. I did notice that at least I had time and my process was working, but without good results. The final W8RKO 80M test went better. I had 24 measurements and all were marked as good. Hopefully this will be one good test. I may do this again.
|Method: Win11 laptop with SpectrumLab, IC7300 calibrated by Agilent 53131A with GPSDO.|
Soapbox: Thank you so much! Good signal in Europe on 40m :)
This is my first experience in such contests. I am a beginner radio amateur and I am very interested in this and I am very glad that there is such an opportunity Thank you! 73!
|Method: E-probe -> TS850 -> sound card. Pre-measure error in freq std with overnight run vs GPS. Record audio near 800 Hz with 10 kHz pilot tone superimposed to measure sampling rate. Only measure key-down part of transmission. No Doppler corrections attempted.|
Soapbox: All signals great (S9+) here in Ontario. 0300 is a good time, at least in this neck of the woods. Thanks to K5CM, W8RKO.
|Method: SDRplay RSPdx; SDRuno software; Cross Country Wireless active loop|
I first did a receiver calibration against WWV 20 MHz. earlier in the evening. I then did an IQ recording for each transmission that also included the CHU transmissions on 7850 kHz. and 3330 kHz. I checked the calibration of the spectrum display against CHU and then read off the frequency of the test signal from the spectrum display, subtracting the offset error from CHU. The frequency was read out to 1 Hz. from the display The tenth of a hertz was interpolated.
Soapbox: My first attempt at doing the FMT with a less than sophisticated setup. Signals were reasonably strong but there was a lot of lightning static and neighbourhood electrical noise which made it difficult to get a decent frequency readout from the spectrum display. Even so it was fun and I plan on doing it again.
|Method: Icom7610 in AM mode 1kHz BW with Bodnar GPSDO 500+-Hz below. Measured audio product with Spectrum lab running decimation of 6.|
Soapbox: Strong signals, K5CM at S9 and W8RKO at 59+20, so my reference was a "carrier" for CM and a sideband for RKO. Nasty QRN for competition on 80m. Fun! Fingers Crossed!
|Method: Old-fashioned method : measured audio beat note (with rcvr in AM mode)|
between target signal and local signal generator locked to GPS for reference.
Soapbox: It seems that I am out of practice. HI
|Method: TS-2000, FLdigi with GPSDO stabilized sig gen for FLdigi ref.|
The 40 m runs went OK but the .csv files for both 80 m runs were corrupted. I had used the FLdigi option to record the audio so I was able to playback the .wav files into FLdigi later to generate good .csv files. The GPSDO stabilized TS-870 was a lot easier to use, but trying the TS-2000 made it a bit more challenging!
Soapbox: All of the signals were very strong altho', there was still lots of Doppler! I had done a lot of test runs using FLdigi and none created corrupted .csv files. I guess Mr. Murphy paid a visit for the 80 m runs :-)
Thanks again Connie and Mike.
|Method: fldigi in frequency analysis mode, best fit to curve|
Soapbox: This is my first entry. I think I've made good observations and look forward to seeing the results. Tnx!
|Method: ANAN-7000DLE, Spectrum Lab and WWV|
Soapbox: Thanks to all for the exercise. Static crashes caused difficulty affecting accuracy.
|Method: Equipment: 160 m. OCF Dipole, IC 7100 Transceiver, Ballantine 300 D VTVM, TEKTRONIX 535 Scope, HP 205AG Audio Generator, HP 5385A Frequency Counter|
Method: Measure near 600 Hz. output from IC 7100 in CW and CW-R modes using 205AG Audio Generator to synch Scope trace and Frequency Counter to present output frequency to 2 decimal places. WWV and CHU used for calibration.
Soapbox: Very noisy conditions but strong signals from both stations on all frequencies tonight. Signal phases varied quite rapidly making it difficult to measure frequencies accurately. Thanks to Connie and Mike for another good job !
|Method: I use a KWM-380 with my own Ref Gen board and Synthesizer board. All oscillators are locked to a homebrew GPSDO (at 10 MHz). I tune the radio to the nearest 10 Hz and then add the reading from SpectrumLab SW.|
Soapbox: All four signals were S9+ 5-10 dB.
|Method: Kenwood TS-890; 30 Ft. vertical w/ATU; Spectran audio analysis software. Prior to test, calibrated against WWV (2.5, 5, 10MHz) where Spectran measured the same 700Hz sidetone while toggling between CW and CW-R. During test, recorded TS-890 frequency where I measured the same 700Hz sidetone in Spectran (as with WWV) while alternating between CW and CW-R modes.|
Soapbox: All four signals were nice and strong. Had a PC screen lock-up in middle of W8RKO 40M test, so wasn't able to compare CW vs. CW-R on Spectran. Interested to see whether my rough tuning was enough!
|Method: Icom 7610 (plus external hi-stability xtal osc) into Spectrum Lab|
Soapbox: Propagation was average with noticeable multipath and doppler shift. Signal strengths were very good with all four transmissions being 15 to 20 dB over S9. Tnx to all for making the event possible.
|Method: IC-7610/Spectrum Lab V2.96 b3 software/HP Pavilion computer/Amazon 10 Mhz GPS Ref. Osc.|
Soapbox: Both stations were 599+ here in NC. Thank you to both stations for providing the "Fun Night",I enjoyed the test. Looking fwd to the next one.
|Method: GPS phase-locked reference injected into receiver input. Frequency delta measured with Spectrum Lab software.|
Soapbox: Strong signals for both stations on both frequencies. Thanks to all for the Test.
|Method: Elecraft K3 USB mode, Spectrum Lab audio software, solar powered hand calculator, pen&paper.|
Soapbox: compared K3 with 10mhz wwv on 40M tests, WWV 5mhz for 80M test
Booming Loud signals from K5CM and W8RKO on 40meters!
No Camera this time. I use the camera to double check readings on rig after test.
I dial down the filter to 250hz to cut out hash, qrm.
|Method: Flex3000 calibrated with Leo Bodnar GPSDO. Detect 500 HZ beat note with Spectrum Lab and/or Fldigi.|
Soapbox: Thanks to K5CM and W8RKO !
|Method: HP 3586 Selective Level Meter sync with a Leo Bodner GPS. Receive antennas were a shielded loop with preamp and a horizontal 80m loop.|
Soapbox: Group effort by many interested club members. Downside was operation was almost cut short by nearby line of approaching thunderstorms making copy difficult.
|Method: Hammarlund SP-600 with synthesizers|
Soapbox: Thanks again folks. RKO on 40 very weak, other signals good in California
|Method: LPDA antenna input to an R&S ESH-3 coherent receiver output to an HP-5370B counter with all 10 MHz references from a rubidium standard disciplined from a GPS source. Data taken over GPIB and sent to a PC with post-pass data reduction via EXCEL.|
Soapbox: It was 45 degree cold in the shack here on a left coast mountain, so I may have some mistakes due to numb fingers. All signals were super strong with C/N ratios at 30+ dB and no interference.
Thanks to K5CM and W8RKO for another fun test.
|Method: Just a basic system: |
FLEX-3000 Transceiver with +/-2.5ppm TCXO.
Autocalibrated to WWV at 25 MHz.
Soapbox: This was my second attempt at the FMT. I had some inconsistent results last time, either due to some drift, or a typo, so I am hoping to do better this time around.
I had the rig warming up for several hours in advance. I was receiving WWV at 25 MHz and was able to check calibration prior to each run. My rig has a +/-2.5 ppm TXCO, and seemed quite stable during the FMT. I used the rig without any external assistance, hoping to be within +/- 1Hz. Next time, I may try using FLDIGI or JWST to see if I can improve the measurement resolution using their reference tools.
|Method: K3 GPSDO / ear|
|Method: RSP1A SDR with SDRPlay software, indoor wire antenna. Well warmed up and calibrated with WWV. Nothing else. Frequency read directly from the spectral display. No statistical analysis this time.|
Soapbox: I turned off every noise making piece of electronic equipment in my place, which helped. I heard all transmissions. Thanks to both for starting precisely on time, which helps identifying weak signals. Thanks to Connie for his long work on the FMT.
|Method: Used a GPSDO stabilized Sig Ent SDG-2042X injected in to the receive loop of my GPSDO stabilized K4D. G3RUH GPSDO fed both sig gen and receiver. Used the fldigi FMT modem and plotted the compensated unknown frequencies ( 10 samples/second) then trimmed where large excursions happened. Anyone's guess if the FMT modem was tracking the "right" signal!|
Soapbox: Fun as always. Strong signals here free of QRM. Thanks Connie and Mike for providing the signals. GPSDO sig gen and receiver used. Next time will try a GPSDO stabilized RSPduo with an injected reference signal.
Soapbox: Hopefully my arithmetic is correct.
|Method: ICOM IC-7610 Leo Bodnar GPS DO, using FLDIGI|
Soapbox: This was done as a team effort between KD9VUZ, AK6AW, AD8Y, and KE8IKY.
Soapbox: All signals were over S9 strength at my QTH. Lots of QRN at my QTH.
Lots of Doppler shift in measured frequency.
Thanks for running this event.
73, Geoff - W8GNM
|Method: Bodnar mini as reference, receiver is FT-1000MP with my design REF module that is referenced to a separate Bodnar mini. Signal processing by Fldigi 4.1.26.|
Soapbox: FMT started at the same moment that NCCC Sprint ended, thus was rushed to switch from contest setup to FMT setup. I have little confidence in my K5CM 40 m run, as I only measured ten data points. The other three runs had good signals and solid measurements.
|Method: 160m OCF, Flex 6700 w/GPS, WSJT, Excel|
|Method: FlexRadio 6500 locked to Trimble GPSDO. DDS errors calculated and corrected. Denon digital audio recorder makes WAV file of Flex audio output and a 2 kHz reference tone from a GPS locked HP3325A function generator to correct for sampling rate error in Denon recorder. Envelope weighted frequency measurement is made with homebrew GNU Octave code which analyzes the WAV files.|
Soapbox: Thanks to K5CM and W8RKO for their efforts. The FMT is always fun. Good signals from W8RKO on both bands out here on the west coast.
|Method: FLEX-6700 & FLDIGI "FREQ ANALYSIS" mode.|
Soapbox: Signals were strong. S/N ranged 50dB to 62dB. K5CM was strongest. More apparent doppler than APR2022 and APR2021 at my QTH.
|Method: Apache 7000DLE, FLDigi FMT mode, two Bodnar Mini GPS -- one for 10MHz on the rig and one for FLDigi reference.|
Soapbox: A lot of fading here but have high hopes for the measurements.
|Method: Recorded IQ data from IC-7610 using HDSDR. Reference signal injected into antenna line to find errors in signal path and software. Used Python script for 3 x 512k point FFTs (Fs=30kHz, 17sec window) for each run and then averaged.|
Soapbox: Great signals all around. 80m runs were very strong with no QRM and looked like signal generator outputs on my plots :-) Thanks Mike and Connie!
Soapbox: Good signals tonight. Thanks, guys.
|Method: Icom-7300 using Bodnar GPSDO ref. signal. Record FMT test signal data using FLDIGI in FMT mode. Plot data on a chart to eliminate data outliers.|
Soapbox: Good signals from both stations on both bands in NC. The K5CM FMT signals on both bands had more doppler then W8RKO. Always look forward to performing the FMT. Glad the FMT band areas were clear of QRM this time. Thank you both for taking the time to do the FMT signals for us all! Hope to see you both next time for the FMT.
See you all on the bands soon,
Best of 73s,
|Method: Direct conversion receiver with Leo Bodnar GPSDO as the master oscillator, elliptical audio filter, and horizontal loop antenna. WSJT-X and Spectrum Lab to acquire data. Excel and Scilab to analyze and process. Receiver calibration done with homemade GPSDO and WWV.|
Soapbox: Signals into New Mexico were quite strong on both 40m and 80m. Signals had significant multipath propagation effects with double (or more) peaked responses - K5CM 40m ~ 0.4 Hz spread, W8RKO 40m ~ 0.8 Hz spread, and W8RKO 80m ~ 0.5 Hz spread. Thanks to Connie, Mike, and ARRL for making this event possible.
|Method: Receiver: Icom R-8600|
Antenna: Optibeam OB3-16 (20m-10m) at 50 ft - used as nonresonant receiving antenna
GPSDO: Jackson Labs Fury
Software: Fldigi (current version)
Used GPSDO as external frequency reference for R-8600.
Averaged Fldigi measurements during key-down period.
Soapbox: Got busy with other things and didn't remember until 0330Z that the FMT had already started - so missed 40m transmissions entirely. Got to the shack, launched the software and tuned the receiver just as K5CM started the 80m key-down period.
|Method: GPS disciplined signal generator compared to off air using Spectran on PC|
Soapbox: Some QSB on K5CM 40 meter, strong S9+, W8RKO also strong S9 on 40. 80 meter had some digital QRM on K5CM, but hope the final result is good, clear for W8RKO, both S7-S9.
|Method: Kenwood TS-2000, Cushcraft R8 Vertical for 40Meters, End Fed Dipole for 80 Meters, HP Win 10 Desktop, Rigblaster PC Interface, Fldigi software in frequency analysis mode.|
Soapbox: Signals were good on both bands. A lot of QSB on 40.
|Method: IC-7610 with gpsdo reference and WSJTX frequency measuring software|
|Method: Anan-100D w/Trimble Thunderbolt GPSDO, software Fldigi 4.1.23|
|Method: Normally use my IC-718. Just forfun I'm trying my Xiegu G90 controlled by Flrig and Fldigi.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 very strong S9+10 on 40M and 80M using end fed antenna.|
Soapbox: Thanks Connie and Mike for your time and the fun!
|Method: Flex5000a using a Rubidium Reference. FLdigi in Frequency Analysis mode. Average about 15 seconds during the middle of the key-down time.|
Soapbox: My first FMT in a couple of years. A lot of QSB on 80m especially for W8RKO.
|Method: Equipment: HF2V antenna, an HP 3586C with a 10 MHz external reference from a GPSDO, an RSP1A and a computer running SDRuno and DL4YHF's Spectrum Lab software to analyze a 15.625 kHz IF signal from the HP 3586C.|
Method: The RSP1A is used to find the frequency of the call-up signal. SpecLab is used to determine the frequency of the peak of the 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, also from the HP3586C.
Soapbox: Thank you K5CM and W8RKO.
|Method: Flex-6500, GPSDO 10MHz In, WSJT-X FreqCal mode|