Results - November 8, 2019 FMT
|Actual Radio Frequencies (Hz):|
K5CM All (<=0.1 Hz):
AA6LK, AB2UW, AB4RS, AF9A, AK4PK, K0WM, K1FR, K6FOD, KA7OEI, KB5MU, KG4ARN, N1IRO, N2GL, N3FG, N6RDR, N7WS, VE2IQ, VE3OAT, VE6KZ, W1IR, W2EMN, W2FD, W2PKY, W2TX, W4IVF, W4PG, W6OQI, W7PUA, W8EDU, W9GR, W9INE, W9TN, W9WLX, WA2IKL, WA7BNM, WA7IRW, WB6RJH, WB8TFV, WQ6Q, WQ8T, WV5L
K5CM All (<=1.0 Hz):
AA6LK, AB2UW, AB4RS, AC8NE, AF9A, AJ5P, AK4PK, K0WM, K1FR, K3TCT, K4CXX, K5ND, K5RKS, K6FOD, K6HGF, K7NG, K8TK, K9JM, KA7OEI, KB5MU, KD5FX, KD5MMM, KD8SMO, KE7AZ, KF4FC, KG4ARN, KJ6HYC, N1IRO, N2GL, N3FG, N6RDR, N6SKM, N7WS, N8OBJ, N9CIF, VE2IQ, VE3OAT, VE6KZ, W1IR, W1JV, W1KU, W2AGC, W2EMN, W2FD, W2PKY, W2TX, W3FAY, W3JW, W4IVF, W4PG, W5LAC, W5TV, W6BM, W6OQI, W7PUA, W8EC, W8EDU, W8TM, W9GR, W9INE, W9TN, W9WLX, WA1SXK, WA2IKL, WA6VPJ, WA7BNM, WA7IRW, WB4HIR, WB6RJH, WB8TFV, WD4IYE, WQ6Q, WQ8T, WV5L
K5CM 80 (<=1.0 Hz):
AA6LK, AB2UW, AB4RS, AB9TX, AC8NE, AE5P, AF9A, AJ5P, AK4PK, K0WM, K1FR, K3KSB, K3TCT, K4CXX, K5ND, K5RKS, K6FOD, K6HGF, K7NG, K8TK, K9JM, K9MD, K9NR, KA5QEP, KA7OEI, KB5MU, KD5FX, KD5MMM, KD8SMO, KE7AZ, KF4FC, KG4ARN, KG5X, KI5AHH, KI5EE, KJ6HYC, N0PFE, N1IRO, N2GL, N3FG, N5DM, N6RDR, N6SKM, N7WS, N8OBJ, N9CIF, VE2IQ, VE3OAT, VE6KZ, W1IR, W1JV, W1KU, W2AGC, W2EMN, W2FD, W2PKY, W2TX, W3FAY, W3JW, W4IVF, W4PG, W4WJ, W5EEG, W5LAC, W5TV, W6BM, W6OQI, W7PUA, W7SUA, W8EC, W8EDU, W8TM, W9GR, W9INE, W9MDB, W9TN, W9WLX, WA1SXK, WA2IKL, WA6VPJ, WA7BNM, WA7IRW, WB0LXZ, WB2WGH, WB4HIR, WB6RJH, WB8TFV, WD4IYE, WQ6Q, WQ8T, WV5L
K5CM 80 (>1 to <=5 Hz):
AC6SL, AJ4YA, K1LTJ, K4BSD, K4OZS, KB2HSH, N5KAE, W0HBK, W9ZB, WA5UCW
K5CM 80 (>5 to <=10 Hz):
K5CM 40 (<=1.0 Hz):
AA3I, AA6LK, AB2UW, AB4RS, AC8NE, AF9A, AJ5P, AK4PK, K0WM, K1FR, K3TCT, K4BSD, K4CXX, K5ND, K5RKS, K6FOD, K6HGF, K7NG, K8TK, K9JM, KA7OEI, KB5MU, KD5FX, KD5MMM, KD8SMO, KE7AZ, KF4FC, KG4ARN, KJ6HYC, N1IRO, N2GL, N3FG, N6RDR, N6SKM, N7EP, N7WS, N8OBJ, N9CIF, VE2IQ, VE3OAT, VE6IXD, VE6KZ, W0HBK, W1IR, W1JV, W1KU, W2AGC, W2EMN, W2FD, W2PKY, W2TX, W3FAY, W3JW, W4IVF, W4PG, W5LAC, W5TV, W6BM, W6OQI, W7KPZ, W7PUA, W8EC, W8EDU, W8TM, W9GR, W9INE, W9TN, W9WLX, W9ZB, WA1SXK, WA2IKL, WA5UCW, WA6VPJ, WA7BNM, WA7IRW, WB4HIR, WB6RJH, WB8TFV, WD4IYE, WQ6Q, WQ8T, WV5L
K5CM 40 (>1 to <=5 Hz):
AB9TX, AC6SL, AJ4YA, K1LTJ, K4OZS, K4PH, K9MD, KA3NAM, KB2HSH, N0PFE, N5DM, VE9DAN, W5EEG, W7SUA, W8LJB
K5CM 40 (>5 to <=10 Hz):
WSJT-X Freq Cal
|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, and at a later time replayed to export data to spreadsheet to refine submission numbers.
Soapbox: Thanks once again Connie for running the event. All signals here were strong and surprisingly stable, although 40M late run reading was ~0.20 Hz higher than the early and 80M late run reading was ~0.14 Hz lower than the early. Guessed somewhere between early and late readings.
|Method: 98' long W5GI dipole oriented E-W connected to Icom IC-7000 (CW mode). SignaLink interface to laptop running Spectrum Lab. During call up, adjusted a GPSDO (Trimble Thunderbolt) referenced, HP 3335A frequency synthesizer to about the same frequency. After key-down, switched the radio input to the synthesizer (through an adjustable attenuator) and adjusted the synthesizer to the same frequency (used SL peak detect function). Read each frequency directly off the synthesizer. No radio or computer sound card calibration is needed with this method, but warmed both up for several hours so they were stable during the FMT.|
Soapbox: Both 40m & 80m signals strong in FN30. Lots of doppler on both frequencies. Thanks to K5CM for his FMT efforts.
|Method: HP3586B referenced to 10 MHz from Trimble Thunderbolt. Audio IF extracted, and recorded and analyzed using SpectrumLab. Calibration of soundcard checked with reference signal generated from a locked HP3336C.|
Soapbox: Fun as always, signals were very stable here in Northern VA, very little shift or drift seen.
|Method: Icom IC-7610 locked to a Sigma PFC. Spectran running for interpolation.|
Soapbox: Noise level S-0 at EN54, vertical polarization 3db better than horizontal. No copy on first run 40M.
|Method: WB0OEW GPSDO, Elecraft K3 without ExRef, fldigi Freq Analysis Mode|
|Method: Flex 6700 set on usb with bandwidth set to 1400-1600 Hz. GPSDO feeding the Flex to discipline its internal OCXO. Radio set to about 1500 Hz below actual and tone measured with SpectrumLab. Sum radio setting with spectrum Lab and subtract off synthesizer error|
Soapbox: My first attempt at FMT. Great signals in WV (40 dB over the noise) with some fading (+ and - 10dB) on 80M. Thanks Connie
|Method: Flex 6700 / WSJT-X Frequency Analysis Software|
Soapbox: Missed the first run on 40M. Skip was very long for the second 40M run and only got one decent reading. Will be most interesting to see how close that reading was. Thanks to K5CM for putting this on the air.
|Method: OpenHPSDR Mercury receiver with 10MHz OCXO calibrated against WWV/CHU. WSJT-X v2.1.0, FreqCal mode.|
Soapbox: Big signals S9 +10 to +20, both frequencies, both times. I used the values measured in the 0200 run. They were a little more stable than those at 0500. Thanks Connie !
|Method: Used K3S and zero-beat the tone with the rig ‘spot’ feature. Then adjusted for errors in tuner, then errors in guessing. Truly a SWAG.|
Soapbox: Thanks for doing this, I had a blast, as usual.
|Method: FLDIGI and IC-7300|
Soapbox: signals just above the noise both bands. 0200z readings
|Method: FLEX-1500 radio with Bodnar GPS disciplined 10 MHz Reference Clock. To measure the audio tone, I used Spectrum Lab with a 131072 point FFT which produces a width for one FFT bin of 91.55 milli-Hz and an FFT window length of 10.92 seconds. I calibrated my radio using CHU and a homemade clock divider that divides my 10 MHz reference down to a 1000 hertz audio tone. Then I tuned my radio to get as close to 1000 hertz as possible and interpolated the fraction of a hertz from the Spectrum Lab display.|
|Method: Equipment is a Yaesu FT-1000MP Mark V transceiver (CW mode, narrow CW filter and audio DSP with 60-Hz bandwidth), Rockwell/Collins 180S-1 tuner, 40-meter dipole, Fluke 8845A as an audio frequency meter. Record CW audio frequency; remove fades and outliers. Calibrate the receiver with a Bodnar GPSDO. Do a two-minute run on WWV 5 MHz after the 80-meter transmission to check conditions and analyses.|
Soapbox: Strong consistent signals on 40 meters. Variation on 40 meters and WWV 5 MHz was relatively low; there was more variation on 80 meters. Thanks to Connie K5CM for his continued support of this interesting event.
|Method: Flex 6700 with GPSDO and Spectrum Labs|
Soapbox: First time in FMT. Enjoyed it greatly. With my poor old random wire, K5CM was weak on 40m but strong on 80m. Thanks Connie and 73.
|Method: Flex 6600m / WSJT|
Soapbox: First time FMT
|Method: IC-7300 and WSTJ-X frequency measure mode. Used a GPSDO to reference a HP3336C signal generator. I used that signal to calibrate WSTJ-X just before FMT started.|
Soapbox: Both signals were strong, but 40m reading especially did not give a stable reading in WSTJ-x, so I averaged the readings. I don't have much confidence in my answers.
|Method: Correction to prior entry. Forgot to include WWV calibration offset.|
|Method: Kenwood TS 2000 receiver beat analog signal generator against K5CM measured generator with HP 5328A Counter.|
Soapbox: S9 both bands no QRM
|Method: HF transceiver with random wire antenna and non-radiating injection coupling from synthesizer with fractional Hz resolution. Measured synthesizer error with WWV-10, then the 02xxZ signals, and applied correction from WWV-10 calibration check. Measurements were made with aural zero beat enhanced with SSB BFO ("3rd oscillator" technique).|
Soapbox: The signals were quite usable into central FL on this early run. Thanks to Connie, K5CM, for his continuing support of this esoteric sport.
|Method: Flex 6600 w/GPSDO, WSPR Command Line Tools, Excel Spreadsheet|
Soapbox: First time FMT.
1st Run 40M Signal S9+10 to 20
1st Run 80M signal s5 to s7, some QSB
2nd Run 40M S5 to S7, occasional deep QSB
2nd Run 80M signal S4 to s6, deep rapid QSB
|Method: Comparison between the audio frequency of a generated signal against the unknown FMT test frequency.|
Soapbox: I'm not sure it's even worth reporting these results. I'm finding that the sound card in my SignalLink USB interface seems to have linearity problems. There is as much as a 62Hz error when changing the reference frequency by 1 kHz. The reference frequency is being generated by a GPS disciplined generator but is very harmonic rich and this may also be the cause of my problem. I wish we had an FMT more than twice a year so I could work through my issues. Six months from now I won't even remember the problems I had. Fun just the same, thanks...
|Method: Measurement was made utilizing my Icom 7300 and FLDIGI|
Soapbox: Band conditions provided strong signals on both bands. Thank you for a fun event.
|Method: IC-9100, WJST-X Frequency Calibration mode, calibrated to WWV / CHU /AM broadcast stations two hours prior to measurement.|
Soapbox: Measured early run only. 40 meters was weak at S3 but clear carrier visible on the WSJT-X trace. 80 meters was strong at S9 with solid measurement. Hope the calibration was good! Thanks for running the FMT. I enjoy the challenge and appreciate the quick results posting.
|Method: Injected signal from HP3336B into T connector so rig sees both on-the-air signal and RF from HP3336B. HP3336B used external 10Mhz frequency reference which is GPS disciplined. Rig is ICOM 7600 operating in USB mode. Homebrew software measures frequency of audio tones coming from rig to determine offset in Hz between signal from HP3336B and K5CM.|
Soapbox: All four FMTs were usable with noise at about S5. Signal level for K5CM at about S7. This was the case for 40m and 80 on both early and late runs. To get final reading I just averaged early and late runs for band of interest.
|Method: Used K6OQK methodology with HP3586B receiver and Siglent SDG2042x waveform generator (both GPS-referenced with Trimble Thunderbolt).|
Soapbox: This is my first ARRL FMT, so I'm just getting my feet wet. If there is any accuracy to my results, it's entirely due to great mentoring by Burt K6OQK. If they're wrong, he disavows all knowledge.
|Method: 3586B, 3336B, Spectrum Lab, Scope|
Soapbox: This is a resubmission. I made a typo on the 40m frequency in the first submission. Please use this. Thanks es 73...Doug K6HGF
|Method: IC-7610, 43' Vertical & SpectrumLab. Measurements corrected for reference error and best estimate of ionospheric Doppler.|
Soapbox: Could barely hear K5CM on 80M on the early run but I got some likely looking numbers just the same, and due mostly to my fumbling around, plus Growlight RFI, the early 40M run was nil. The late run signals on both bands were excellent, and spreading of the signals was less.
FMT is great fun.
|Method: HP3586B GPSDO Dipole|
|Method: K3 and tuning forks|
Soapbox: Good signals both times.
|Method: Icon 7300 and audio tone generator. I began by finding WWV on 10 MHz and 5 MHz.I set frequency to 10.000.000 and adjusted the tone generator to match the tone noting the point of slowest standing wave warble. For my radio this was 600.4 hertz. During the broadcast I adjusted the rig to best match and submitted dial reading.|
Soapbox: Although I am an extra class license, this is my first attempt at FMT. The rig is new to me and I had to figure out how to display the frequency down to 1 Hz. I found the frequency spectrum scope helpful in that the test signal was remarkably clean and I could center it in the display. I hope I am close!
|Method: FLEX 6600 with GPSDO & WSJT-X|
Soapbox: Early run at 0200z...
40 Meters was barely copyable on both runs with very weak, noisy signals. Cherry picked the hopefully best measurements and averaged them. Not too confident with the 40 Meter results.
80 Meters was again strong early but with much deep QSB on the late run but I screwed up on the early run by forgetting to write down the radio frequency so I made my best guess based on memory. I may have done well or NOT! My XYL doesn't place much store in my memory!
Hope everyone did well!
|Method: K1JT using WSPR|
Soapbox: 40m signal was weak. Fair amount of QSB. 80m signal was really weak. Not many good samples gathered so expect some error there.
|Method: Harris RF-590, audio was recorded and analyzed with Mathematica.|
Soapbox: Weak signal on 40 meters, too weak to analyze.
Soapbox: Early - both signals good. Late - 40 meters weak, 80 ok. Used GPS-locked signal gen (Schlumberger 4031) to generate signals in passband - recorded audio, analyzed signals on playback and determined K5CM and local signals to calculate RF frequency.
|Method: Yaesu FT-817ND tied into WSJTx via G4ZLP "CAT" control cable.|
|Method: Flex 6600M with GPSDO, WSJT-X, visual averaging with S/N weighting|
Soapbox: My first FMT attempt! Signals not super loud here. Was only available for the early session due to family emergency.
|Method: FLEX6300 with Spectrum Lab. Calibrated to WWV & CHU. VERY POOR signal on 40 mtrs, S9 signal on 80 mtrs.|
Soapbox: Even with poor signal I was getting data into Spectrum Lab!
|Method: FT847, Speclab, CHU for reference|
Soapbox: only did the first run. great sig on 80m, 40m a bit weaker. no chu for 40m, kinda guessed offset from past fmts.
|Method: Spectrum Lab Kenwood TS-590|
|Method: FlexRadio 6600 with BG7TBL GPSDO 10 MHz reference. Flidgi and WSJT-X for data collection. Data cleanup and analysis in Excel.|
Soapbox: First time with this setup. Lots happening in 2 minutes. 80M signal in early run was weak. Interference from noisy charger in the neighborhood on top of 40M frequency went off right at 0200Z! Made lots of notes for the next time.
|Method: Flex 6400 WITHOUT 10 Mhz frequency standard. Numerous days of setting up calibration curves with WWV and CHU in Canada. Fldigi in Frequency Analysis mode and recording in CVS spreadsheet with analysis.|
Soapbox: Good signals and only did the first two measurements. I had a lot of fun getting ready and doing the test. Thanks to all for your effort. 73's. Fred
|Method: Used a homebrew superhet rig using VFO and BFO disciplined by GPSDO.|
The oscillators were from RIGOL DG4162 signal generator.
An AGILENT 53181A frequency counter was used to measure the baseband frequency. Vertical antenna tuned for 40 meter band only.
A series of measurements were recorded using the GPIB interface to the frequency counter.
The unknown FMT frequencies were converted to a first IF of 9 MHz then to a baseband frequency of 4.915 MHz.
The 4.915 MHz baseband signal was measured by the frequency counter and the unknown Frequency determined by calculation.
Soapbox: Some rudimentary analysis of the data using a moving average of the frequency, suggests there was some Doppler shift during the test. Signal strength was goo for both bands and both runs with a few episodes of sudden, brief QSB.
|Method: RSP-2 calibrated with WWV, long wire antenna.|
Soapbox: 40 meter signal not heard at this location at 0200z or 0500z.
|Method: TS590sg + TCXO + WSJTX + 40M horz loop in attic|
Soapbox: Did not try on second time period
Couldnt copy 40M
80M was very strong
|Method: Kenwood 2000 and Spec Lab.|
|Method: Icom IC 7610, Calibrated the IC 7610's time base to WWV 10 Mhz. Took frequency measurement on Icom IC7610's. Set display for 2.5K display resolution, Using a magnifying glass, When the 2 vertical cursor lines are in balance and on the frequency vertical line, read frequency and record. THATS IT!|
|Method: My SOP: K3 with P3 and home build AMD based PC with Spectrum Lab. Let the receiver warm up for an hour or so then calibrated local Osc to WWV on 5MHz. AV640 vertical.|
Soapbox: I was not as prepared for this one. There continues to be a certain level of guesswork that happens due to the rough resolution in Spectrum lab and my uncalibrated ear. Historically, I have not done too bad but this one I am not very sure about. Signals from Oklahoma were good to Austin on 80 but 40 meters seemed weak. Bands were both relatively quiet and but 40 meters seemed to have a lot of fading.
|Method: Kenwood TS-2000 clocked by GPSDO in CW mode. Spectrum lab on Computer.|
Soapbox: Thanks again for doing this I look forward to every one!
|Method: GPS referenced HP 3586A Selective Level Meter with 80/160 Fan Dipole|
Soapbox: Should have participated in the practice runs. Second run reported. Thanks Connie!
|Method: K3, dipole, Spectrum Lab, WWV|
Soapbox: Every thing was rushed on my part when at the last minute I discovered a serious software problem. Hi. Any way, here are the results for better or worse. Many thanks to Connie for another fine event.
|Method: FT-3000 w/DigiPan 2.0. Dipoles 80/40.|
Soapbox: 40m - Barely readable s1 in noise and QSB. 80m - s9+20 solid. Thanks Connie.
|Method: ICOM 746pro, zero beat, LSB mode. 80 and 40M inverted vees.|
Soapbox: late run, 40M sigs were hardly heard. Late run, 80M sigs were 20 over.
|Method: Yaesu FT-920 and my two ears.|
Soapbox: S9 on 80M, nothing heard either time on 40M.
|Method: No frequency counter...|
No Spectrum Labs...
Just an old radio, an old PC, and Joe Taylor's fantastic programs.
Soapbox: Good signals in Los Angeles on both runs.
Slow but deep QSB on 40 during the first run.
Ran each run separately and then averaged the two.
|Method: Yaesu 857-D with GPSDO thru a SignaLink USB to a Mac Mini running Mojave. Frequency analyzed using both WSJTX and FLDIGI with analysis data averaged via Excel.|
Soapbox: The 2-minute frequency averages from WSJTX and FLDIGI differed by 24 millihertz on 40 meters, so I split the difference. It will be interesting to see which utility gave the closer answer.
Signal on 40m ranged from s1 to s8, while on 80m it was s1 to s7.
Thanks, Connie, for running the tests twice.
|Method: ICOM IC-7300 transceiver, 43 foot vertical antenna, Speclab software, WWV, CHU and luck.|
Soapbox: Signals were good, Doppler was non-existent. It can't get much better. Thanks to the ARRL, K5CM, N0AX for the FMT.
|Method: RF Space SDR-IQ receiver with DG8SAQ VNWA used in signal generator mode to inject offset frequency, VNWA clocked with Bodnar GPSDO. DDS errors determined with BG7TBL FA-2 counter (GPSDO ref). Audio beat recorded with SPectraVue SW for analysis with Spectrum Lab. Averaged two readings.|
Soapbox: Only my second try at this. Lots of fun but too many variables to account for by my method. Probably made some math errors. First measurement I recorded RF spectrum instead of demodulated audio. Demodulated that in post processing but not the best way to do it. Like to see these happen more frequently.
|Method: FLEX6500, Leo Bodnar GPSDO freq ref @ 10 MHz for FLEX6500, Gap Titan Antenna, running 4 instances of FLDigi 4.1.08, FLEX6500 running 4 Slices on receiver (WWV 2.5MHz, WWV 5.0 MHz, WWV 10.0 MHz, FMT Freq) and running into 4 copies of FLDigi running concurrently. Used FLDigi Freq Analysis mode by using USB mode and shifting down 1KHz to get a 1 KHz tone.|
Soapbox: My 2nd try at this - at 5:00 UTC the Ionosphere is MUCH more stable for Doppler shift (which is really what the biggest error inducer into the measurement is). Found a sweet spot on both runs to cherry pick the freq estimate.
|Method: Icom IC-7200 and WSJT-X lined up with WWV and CHU.|
Soapbox: My results are from 0500Z. I could barely hear the 40m signal at 0200Z. Otherwise, signals were good.
|Method: Antenna: HyEndFed 40m/20m/10m at 5m Above ground|
RIG: SunSDR2 QRP
1:RX1 @ 4996000Hz Moscow Time/Frequency Standard, RX at +0.05ppm, to find actual RX error at 2:00Z (pre-adjusted a few weeks ago)
2:RX2 @ 7064000Hz FMT Signal received at 7064986.0Hz
3:correction -0.05ppm --> -0.35Hz --> FMT at 7064985.65Hz
Problems: RST K5CM 419 with QSB, very weak, and very short burst
Only received at 2:00Z on 40m
Soapbox: Will Store HDSDR formatted IQ files after closing date on my Google drive available for all interested people.
Last point: FMT takes place at midnight PA time, next day was normal working day, so I let my RIG run at night and logged IQ data on my PC while I was sleeping, and today Friday Evening I am checking the exact frequency, so had time to listen and listen again. It might be seen as cheating, but I need my night rest for a normal working day, hi. Next year I will try to take a day off on Friday, so I can do the test real time.
73 es all the best from The Netherlands,
|Method: E-probe > TS850 > soundcard (calibrated per GPS) > FFT, average "best" selections, adjust for known offsets.|
Soapbox: All transmissions readable. Early 40M, 80M weak here but both later transmissions 599+ so naturally I submitted the earlier ones! No Doppler "corrections" applied. Tnx Connie for another good one.
|Method: "Beat note method" with receiver in AM mode and injected reference signal from synthesizer driven by 10 MHz GPS-disciplined oscillator.|
Soapbox: All signals were good although 40m signal on early run was a little weak. Earth's magnetic field (Kp index) behaved itself too. Reported results are both from the late run. Many thanks to Connie for all his work to keep us challenged and entertained.
|Method: Flex 5000a, inverted-V dipole cut for 80m, WSJT-X v.2.1.0|
Soapbox: On 80m I could not detect the signal at either time. Last year using an FT817 (poorer receiver) but same location and antenna I was able to receive the second transmission, but not this year over the ever increasing noise.
|Method: HP-3586B receiver and FE-5680A reference with G5RV antenna, HP-3586B to HP-3582 Audio Spectrum Analyzer|
Soapbox: Using a 1850.10 Hz reference from HP-3586B audio output to HP-3582, with 20mHz bandwidth the signal level was 10 dB over noise floor. Doppler of +/- 0.4 Hz also seen on signal. Thanks to Connie for the experience.
|Method: SDRplay RSP-1 plus RSP Spectrum Analyzer|
Soapbox: I am not convinced that Hams can measure Hz to within 1000/Hz, and report it. Sure, we can all do statistics, MEAN and AVERAGE etc, but that is the mere use of a spreadsheet and choosing how many decimal points you want to display. My question is this -- have we lost the use of Significant Figures and their meaning?
I like the Early and Late run method. Late run skewed 40M by 2 Hz. Connie's signals were strong here on the East Coast throughout.
Tnx C for the test. Always enjoyable and fascinating.
|Method: Yaesu FTDX3000 direct frequency measurement.|
Soapbox: First run 40M no propagation, 80M 599. Second run 599 both bands in Cedar Rapids, IA. Thanks again Connie!
|Method: I got close to the frequency during callup using an Elecraft K3S with it's nice CW tuning indicator. I used an HP-3586C Selective Level meter stabilized with 10MHz from a T-Bolt GPS disciplined oscillator. I shut off auto-cal, locked RF gain, used LSB with 20 Hz Bandwidth, then switched the 3586C to frequency counter mode and monitored the frequency, ignoring the shifts during deep fades.|
|Method: Thunderbolt, HP 3586C|
|Method: E-MU 0204 soundcard and Softrock Ensemble RX II. Spectrum lab. 192 KHz sampling rate decimated by 12, 262144 input FFT. Windows crash less than 10 minutes before 0200UTC meant I lost calibration on the Softrock. Over-the-air offsets calculated from CHU3.33 and WWV5 recorded between the 40m and 80m tests. Expected offset interpolated linearly. Computed offsets were 5-10 Hz instead of my usual < 1 Hz, so we will see how I did with this hiccup.|
Soapbox: Good FMT signals and CHU 3.33 and WWV5. No reception of CHU 7.85. Thanks for running this again.
|Method: IC-718, 40m OCF dipole. Aural zero-beat with 1000-Hz tone, carrier offset +1kHz.|
Soapbox: Nice signal on 40m; very bad QRM on 80m, required sliding BPF down to get acceptable carrier beat tone.
|Method: Beat incoming signal against HP 8660 signal generator on R-390A receiver. Measured audio with Rigol digital scope. All equipment calibrated against rubidium standard.|
Soapbox: Tough staying up for the midnight session, but signals were good on 40 and readable on 80. The sharp audio filter in the R-390A improves the S/N of weak signals.
|Method: IC 7100 Transceiver in CW Mode with 600 Hz. Offset and 50 Hz. BW filter--Audio Generator-Oscilloscope. Measure frequency of CW (near 600 Hz. Tone) audio output from Transceiver by varying audio generator frequency to synch with receiver output. Calibrated Receiver with WWV 15 MHz. at 2200Z.|
Soapbox: Thanks Connie, Bruce and all ARRL Personnel involved with the FMT. Signals from OK were about the same on both the early and the late runs in WPA. The 40 meter signals were very stable with signal levels approximately S9 and the 80 meter signals had a fair amount of short term phase variation with S9+20 signal levels on peaks. Both bands had fairly low noise conditions.
|Method: Flex 6700 BG7TBL GPSDO FLDIGI. Early run only. Deleted outliers using a Scatter Chart and averaged in Excel.|
Soapbox: Signals were over S9 here in central Florida. Monitored WWV 2.5, 5 & 10Mhz receiver appeared to be dead on. FLDIGI makes it easy combining dial frequency with decoded tone into a .CVS file, no math required to arrive at entry value. Added Flex Slice error for grins.
Lots of fun, thanks Connie.
|Method: I collect time-stamped data from two receive stations. One station is a stock RF-590 receiver and the other is a KWM-380 modified with a custom Ref. Gen. PWB. Both receivers use an outboard soundcard running Spectrum Lab SW. All equipment is locked to a GPSDO. The transmit frequency is the sum of the receiver dial frequency and the Spectrum Lab reading. The antenna (this time) was an untuned 43 ft. vertical.|
Soapbox: Varying Doppler on both bands for both the early and late runs. 40M was stronger for the early run (100uV vs 20 uV on 80M), but 80M was stronger for the late run (10 uV on 40M vs 100 uV on 80M). This is my 4th FMT in GA; your signals are definitely stronger here than they were in FL. Thank you for your efforts, Connie!
|Method: Elecraft K3 w/TCXO option; 30 Ft. vertical; Spectran audio analysis software. Prior to test, established freq error correction factor against WWV (2.5 - 10MHz). During test, recorded K3 frequency where 600Hz sidetone frequency measured the same in Spectran while alternating between CW and CW-R modes. Applied correction factor to recorded frequencies for submission.|
|Method: IC-7610 (external GPSDO) into spectrum lab|
Soapbox: Early 40M signal was S9 (lower than normal)--early 80M signal was S9+20dB---Late 40M signal was S9+15dB and the late 80M signal was S9+15dB---doppler and multipath were very noticeable on both frequencies but much worse on the 80M signal. Tnx to Connie and all who made the event possible.
|Method: IC-7300, Spectrum Lab, HP Pavillon Desktop.|
Soapbox: Both K5CM signals 599. 80 Meter solid, 40 Meter some QSB, thank you.
|Method: Compared received signal with a GPS-locked reference using Spectrum Lab.|
Soapbox: Thanks, Connie.
|Method: Flex 6700 with GPSDO and Spectrum Labs. Calculate internal Flex error with Putty. Rig ran all day prior to test.|
Soapbox: My first FMT in many years and first time trying this method. I had some last minute issues with Spectrum and don't think I had it set up as I should but I'm learning! A lot of fun and look forward to more.
|Method: W4WJ FMT SET UP |
GPS: Lucent/Symmetricom Z3810AS
RECEIVER: GPS Locked RACAL 6790/GM
Tunable in steps of 1000Hz, 30Hz or 1 Hz.
SYNTHESIZER: GPS Locked HP 3336B
ZERO BEAT INDICATOR: Tektronix 2213A
ANTENNAS: GAP Voyager, GAP Titan DX, NVIS Dipoles 40 & 80m
CONFIGURATION: The post-filtered 455 KHz IF from the RACAL is fed to CH A
of the Tek. A precise 455,000.000Hz carrier from the HP3336B is fed to the EXT input channel of the Tek. The scope is then set to display 2 cycles of the 455KHz IF waveform, instead of the traditional Lissajous pattern.
PROCEDURE: Frequency readings to 1Hz resolution are quickly made by tuning the RACAL to near zero beat with the aid of the Tek scope. If a signal is “dead on” a Hz point, such as WWV, and there is no Doppler, the waveform will not “slip” in either direction but will just vary in amplitude with changes in signal strength, and the "exact" frequency will be the Racal frequency readout.
If a signal is not "dead on" a 1Hz point, and the waveform is "slipping" L TO R, then the RACAL is tuned BELOW exact zero beat. If a signal is not "dead on"
a 1Hz point, and the waveform is "slipping" R TO L, then the RACAL is tuned ABOVE exact zero beat.
If “stepping” the receiver 1Hz causes the direction of "slip" to reverse, the exact frequency is BETWEEN the current and former readout, i.e. between two concurrent 1Hz points. Also, estimates closer than 0.5Hz, of the actual
frequency, can be made by comparing the "speed" of the ABOVE and BELOW "slip." The slower "slip" is less than 0.5Hz from that 1Hz point.
For more accurate “in-between-Hz” measurements, the RACAL is tuned ABOVE the unknown frequency and the HP3336B is then tuned upward, in 0.001Hz steps, from 455,000.000Hz until the R TO L waveform "slip" stops. The milliHz DELTA is then SUBTRACTED from the RACAL readout to give the “exact” frequency.
Using the regular scope waveform allows very quick “zeroing” of signals, even those that are nearly in the noise. I find it much easier to use than the Lissajous
pattern. It is also very interesting to note the carrier frequency variances that occur during Doppler shift.
No 40m signal on either run! Nothing on the K3/P3 waterfall near the target frequency. Both 80m runs, signal peaked at -60dBm with slow deep QSB to -100dBm. Minimal doppler on both runs. Second run showed a delta of minus 0.058Hz. Posted the second run frequency as it was much more stable on the scope during the key down period than the first run. No spreadsheet or chart recording here! This is analog real time with one subtraction at the end! TNX agn to Connie for his continued efforts for the FMT and fmt-nuts. 73, Don, W4WJ
|Method: Ten-Tec Jupiter and Spectrum Lab V2.94. Calibration with WWV and CHU.|
Soapbox: Good signal in Dallas on 80m at 0215Z. No reception on 40m at 0200Z, and no audible copy at 0500Z, but measured a weak spectral line.
|Method: Flex 3000 in LSB mode. Tune for 440Hz tone using Roland VT-12 Vocal Trainer, subtract 440 from dial reading. Also used HP 5301A counter to measure frequency of beat note in an effort to estimate the 1/10 Hz digit, which was not possible on 40 meters this evening.|
Soapbox: I usually use CHU at 7.850 MHz to calibrate the Flex3000 for the 40 Meter signal, but it was not seen. Likewise, 40 Meter from K5CM was very weak at my QTH . Thanks again to Connie for a fun activity.
|Method: Flex 6600 with 10 MHz rubidium standard. Fldigi in frequency analysis mode.|
Soapbox: 80 meters was very strong, but 40 meters was weak with lots of QSB. Thanks to K5CM for the time and effort.
|Method: Hammarlund SP-600 boatanchor|
Soapbox: Why not room to submit frequencies from both transmissions? Later evening results submitted, but earlier transmission heard clearly as well.
|Method: HP3586B locked to GPSDO|
Soapbox: Good signals on both 80 and 40 for both runs. But with usual Doppler shifting
|Method: IC-718, SignalLinkUSB, indoor wire antenna, fldigi. Calculated error function using WWV to correct measured value.|
Soapbox: On Early run, 40M signal weak but readable and 80M barely readable.
On Late run, 40M signal very weak and 80M completely unreadable.
|Method: IC-706 MKII with N6GN 30 MHz input coming from Shera GPS reference. Audio signal is processed by FFT using Spectrum Lab program. I look at WWV before and after to get an idea of the general Doppler shifts.|
Soapbox: Conditions seemed to be very good. Signals from K5CM were strong. Doppler shifts on WWV were 0.1 Hz or less which is often not the case. Thanks to all for doing the test. It is always interesting!
|Method: I was traveling so in hotel where used the W5TSU KiwiSDR receiver from my laptop running fldigi and a virtual audio cable to route the audio from browser to fldigi. 5 MHz WWV calibration runs before and after the early FMT to correct measured frequency. Assuming the KiwiSDR was using GPS to control frequency.|
Soapbox: Had planned to be home but was able to use a KiwiSDR from my hotel. The second run was hard to hear from the KiwiSDR near the TX site so used the early runs. Interesting way to do this. I am guessing the average error of this method was -0.0732 Hz with about 300 measurements in the two calibration runs. My before cal run was half the "error" as my after run but just averaged them together.
|Method: Kenwood TS-2000, WSJT-X, with G5RV; intuitive weighted average of frequency measurements.|
Soapbox: First time entering the FMT. Really appreciate the work of K5CM and the ARRL.
|Method: ICOM IC-7610, rubidium standard.|
Soapbox: No adjustments to sound card, no adjustments for propagation--this is the first time we used the new transceiver for this and we wanted to see how it worked "out of the box." Used fldigi and frequency analysis function, averaged the data collected once per second over the key-down run. Next time we will do more preparation.
|Method: Yaesu ftdx-1200 calibrated to wwv|
|Method: Elecraft K3 warmed up and calibrated vs. 10 MHz WWV. Fractional Hz are guesses.|
Soapbox: K5CM strong. 10 MHz WWV inaudible at measurement time; I hope the K3 didn't drift too much after its earlier calibration.
|Method: 160m OCF, Flex 6700 w/GPS, WSJT, Excel|
Soapbox: Thanks for the challenge.
|Method: FlexRadio 6500 locked to Trimble Thunderbolt GPSDO. HP3325A synthesizer also locked to GPS produces a 2 kHz reference audio tone, used to calibrate the sampling rate of a Denon pro SD card audio recorder. My own homebrew GNU Octave code does a weighted frequency estimate, averaged over the two minute transmission time.|
Soapbox: The FMT is always a lot of fun. I missed the last one in April. During the last FMT I was flying over the Aleutian islands on a flight to Taipei. Even if I had radio gear on the plane, Doppler would have been very bad due to the plane's speed! Mobile reception not recommended for the FMT.
|Method: FLEX 6700 and FLDIGI|
Soapbox: Signals were about -90dBm with 55dB S/N.
|Method: Apache ANAN 100 WSJT-X fmt utilities|
Soapbox: 40M was too weak for me.
80M had .3 RMS
|Method: Classic AM heterodyne method: inject known RF signal just below unknown and measure AF beat note. GPSDO referenced R&S SMHU to step attenuator to lossy tee on feed line from 20m EDZ to HP 5335 and IC-756Pro in AM mode. Audio out to laptop with calibrated sound card and DL4YHF Spectrum Lab.|
Soapbox: Another first timer here. Signals were good on both bands for both sessions. What a great excuse to fire up the old test equipment and learn something. Been wanting to do this for a while now after becoming a novice time nut. Already planning improvements for next time. Thanks to Connie for a fun event.
|Method: Flex 6600 GPSDO locked/Using FreqCal feature in WSJT-X v2.1.0|
Soapbox: First time participant in FMT, hoping not to embarrass myself! Very weak signal on 40m at 0200 and good signal on 80m into Milwaukee, Wisconsin. Excellent signals at 0500 with little to no QSB on both 40 and 80.
|Method: Hustler 6BTV antenna, ICOM 706MkIIG, Rig Blaster interface, HP rp5700 computer w/Win10, WSJT-X in Cal mode.|
Soapbox: Good signals on early run, so didn't try late (midnight EST) run. Thanks Connie!
|Method: Icom-7300 calibrated to WWV (+-) .25hz. perform a FMT test, record data using WSJT-X APP in the Freq. calibration mode, then running a batch program created by my Elmer Mike W9MDB to calculate the recorded Freq. using the recorded data.|
Soapbox: I had lots of fun returning to my understanding of using software to take data readings with my ham station and then using software to do a line-fitting procedure using a best-fit slope and intercept.
|Method: Direct antenna connection to Agilent Vector Signal Analyzer with GPS disciplined crystal oscillator reference.|
|Method: Kenwood TS-570s|
Soapbox: Thanks Connie 73
|Method: Elecraft KX3, horizontal loop antenna, Arduino-based GPS controlled reference oscillator, Spectrum Labs software. Calibrated KX3 with 5 MHz WWV and ref oscillator before, between, and after FMT transmissions. Used cell phone spectrum analyzer for quick audio tone measurement while tuning-in unknowns.|
Soapbox: The 40m received signal was relatively stable, S3-S6. The 80m received signal had noticeable propagation spreading effects (multipath, etc). I like the early/late run format - two chances to get the right answers. Thanks to Connie and others for making this possible.
|Method: Ten-Tec Omni VII, Calibrated using WSJT-X|
Tone frequency measured with WSPR, added to dial frequency with correction for dial error.
Soapbox: 40M run was almost a bust. Very weak here for both runs, but WSPR seemed to be able to hear it ok. The early run was a little better, so that is the one reported. The 80M run was loud for both runs.
Thanks to Connie for his service to us all.
|Method: Receiver: Icom R8600|
Antenna: Optibeam OB16-3, not resonant on FMT frequencies
GPSDO: TrueTime XL-DC Ref
Used GPSDO as external frequency reference for R8600.
Continuing to try software alternatives for frequency measurement. After using Fldigi for the WWV Festival of Frequency Measurements, decided to use its Frequency Analysis mode for this FMT. Averaged the results from the 0200Z and 0500Z transmissions for a final result.
Soapbox: Both 40m and 80m signals were good copy in S.Calif at both times, but with some QSB for both bands. Thanks to Connie, K5CM for hosting this FMT.
|Method: Difference from reference signal method. Elecraft KX3 receiver in USB. QRP Labs HF synthesizer with Rb frequency reference tuned about 15-20 Hz above test signal. Used Spectrum Lab s/w to locate the peak of each signal, determine frequencies, calculate the difference, then write delta values to a file.|
Soapbox: S7 noise level on 80m at both schedule times, so CW call-up hard to copy, but no problem seeing 40m and 80m signals on Spec Lab. Thanks to VE2AZX for the pdf document on "Using Spec Lab for Precise Audio Frequency Measurements". It needs to be updated after 10 years to reflect the current Spec Lab s/w version improvements and links. More practice using Spec Lab and analyzing the data would certainly help me. Thanks to Connie and group.
|Method: HP3586B, Spectrum Lab, 80m dipole. Operator error on 40m|
Soapbox: TNX Connie & ARRL
|Method: HW: FlexRadio 6600 w/10MHz reference provided by Symmetricom x72 rubidium oscillator disciplined by a BG7TBL GPSDO (one of the "good" BG7TBL GPSDOs). Antenna is a EFHW-8010 end fed wire antenna. |
SW: FlexRadio SmartSDR, WSJT & Excel
Soapbox: First time doing FMT. Had fun doing it even if frequencies are in left field. Interesting in that my 40M readings had a standard deviation of 13.3Hz while my 80M readings had a standard deviation of 0.08Hz. 73, Ron
|Method: HP-3586A selective level meter and HP-8904A function generator locked to Jackson Labs LTE-Lite GPSDO. Compared IF out to 8904A on Rigol DS1054 scope. Antenna attic mount 70 ft doublet.|
Soapbox: good 80 meter signal strength both tests. Not as good on 40 meters.
|Method: Icom IC-756PROIII radio|
Focusrite Scarlett 2i4 USB audio interface
HP 8648D signal generator
Generate reference signal about 1 kHz above the test signal, tune radio so both signals appear on the Fldigi waterfall at the same time, use Freq Analysis mode alternately on both signals to derive correction for VFO and other system errors, observe fluctuations in test signal frequency and estimate the middle of the range.
Soapbox: My first FMT, looking forward to the next one.
|Method: IC756ProII, rebuilt Wavetek 3002 Sig Gen using Thunderbolt GPS 10M Ref.|
Soapbox: 02:00 UTC 40M signal was good, 80M was in the noise
05:00 UTC 80M signal much better
|Method: IC-718 controlled by Flrig and Fldigi.Calibrated sound card and warmed equipment for 2-3 days. Monitored WWV 5000 and CHU 3330 frequencies to find most stable reference by looking at error average,error max and error min. Take the stable frequencies and calculate error per hertz. Calculate hertz difference between reference frequency and key down frequency. Then add or subtract error per hertz to key down frequency. Thanks to Connie again for all the fun! I just did the west coast run and both signals were +20 in Kentucky.|
Soapbox: Thanks to Connie again for all the fun! I just did the west coast run and both signals were +20 in Kentucky.
|Method: Flex 6600M with WSJTX.|
Soapbox: First try! Strong signals on all four runs. Frequencies are averages of the first and second runs for each frequency.
|Method: Equipment: HF2V antenna, FT-920 transceiver, Signalink USB sound card, Rigol RG-1022 signal generator, Lucent RFTG-u GPSDO, DL4YHF's Spectrum Lab software. Method: differential measurement of audio frequencies with Spectrum Lab|
Soapbox: Thank you K5CM.
|Method: IC-7610 with Leo Bodnar's 10 MHz GPSDO reference|
Average of fldigi and spectrum lab observations