Results - November 11, 2022 FMT
|Actual Radio Frequencies (Hz):|
K5CM,W8RKO All (<=1.0 Hz):
AA3I, AA6LK, AB4RS, AD5MT, AF9A, AJ4YA, K0BT, K0WM, K5CM, K6LL, K7NG, KA5QEP, KB2HSH, KD5FX, KD5MMM, KE6ZLX, KG6HSQ, KM6QX, KN1H, M0MTQ, N1IRO, N3FM, N5IY, N5KAE, N6LKA, N7QXB, N7WS, N8OBJ, VE2IQ, VE3YX, W2FD, W2TX, W3FAY, W3JW, W4IVF, W5AJ, W6BM, W6DSR, W7SUA, W8WTS, W9FLA, W9GR, W9TN, WA2DVU, WA5UCW, WA7BNM, WQ8T
K5CM 80 (<=1.0 Hz):
AA3I, AA6LK, AB2UW, AB4RS, AC8XY, AC9LV, AD5MT, AF4ZE, AF9A, AJ4YA, AJ5P, K0BT, K0MZ, K0WM, K5CM, K5ND, K5RKS, K6LL, K7NG, K8DJR, K8YUM, K9OSC, KA5QEP, KA8BRK, KB2HSH, KD2BD, KD5FX, KD5MMM, KD8RV, KD9VUY, KE6ZLX, KE8QEP, KG6HSQ, KG6JDR, KG6T, KM1P, KM6QX, KN1H, M0MTQ, N0PFE, N1IRO, N3FG, N3FM, N5IY, N5KAE, N6LKA, N7QXB, N7WS, N8OBJ, N9CIF, NV3C, VA3MW, VA3RT, VE2IQ, VE3YX, W2FD, W2NMI, W2TX, W3FAY, W3JW, W4IVF, W4VU, W5AJ, W5LAC, W5SSV, W6BM, W6DSR, W6JBR, W7SUA, W8EDU, W8WTS, W9FLA, W9GR, W9MDB, W9TN, WA1SXK, WA2DVU, WA5UCW, WA7BNM, WA9VEZ, WB8REI, WQ8T, WS8U
K5CM 80 (>1 to <=5 Hz):
K4PPK, KA9SVR, KE0NRE, N5LUL, N8TW, NF7R, W9ZB, WB2CMF
K5CM 80 (>5 to <=10 Hz):
K5CM 40 (<=1.0 Hz):
AA3I, AA6LK, AB2UW, AB4RS, AD5MT, AF9A, AJ4YA, AJ5P, K0BT, K0WM, K4PPK, K5CM, K6LL, K7NG, KA5QEP, KB2HSH, KD2BD, KD5FX, KD5MMM, KD8RV, KE6ZLX, KG6HSQ, KG6T, KM1P, KM6QX, KN1H, M0MTQ, N1IRO, N3FG, N3FM, N5IY, N5KAE, N6LKA, N7QXB, N7WS, N8OBJ, VA3RT, VE2IQ, VE3YX, W2FD, W2TX, W3FAY, W3JW, W4IVF, W4VU, W5AJ, W6BM, W6DSR, W6SKD, W7SUA, W8WTS, W9FLA, W9GR, W9TN, W9ZB, WA2DVU, WA5UCW, WA7BNM, WA9VEZ, WB8REI, WQ8T
K5CM 40 (>1 to <=5 Hz):
AF4ZE, K0MZ, KE0NRE, KG6JDR, N0PFE, NF7R, NV3C, W8EDU, WA4BQM, WB2CMF, WB3JFS
K5CM 40 (>5 to <=10 Hz):
W8RKO 80 (<=1.0 Hz):
AA3I, AA6LK, AB2UW, AB4RS, AC8XY, AC9LV, AD5MT, AF9A, AG5AT, AJ4YA, AJ5P, K0BT, K0MZ, K0WM, K4PPK, K5CM, K5ND, K5RKS, K6LL, K7NG, K8DJR, K8YUM, K9OSC, KA5QEP, KA8BRK, KB2HSH, KD2BD, KD5FX, KD5MMM, KD8RV, KE6ZLX, KG6HSQ, KG6JDR, KG6T, KM1P, KM6QX, KN1H, M0MTQ, N1IRO, N3FG, N3FM, N5IY, N5KAE, N5LUL, N6LKA, N7QXB, N7WS, N8OBJ, N9CIF, VA3RT, VE2IQ, VE3YX, W2FD, W2NMI, W2TX, W3FAY, W3JW, W4IVF, W4VU, W5AJ, W5LAC, W5SSV, W6BM, W6DSR, W6SKD, W7SUA, W8EDU, W8WTS, W9FLA, W9GR, W9MDB, W9TN, W9ZB, WA1SXK, WA2DVU, WA5UCW, WA7BNM, WA9VEZ, WB6HYD, WB8REI, WQ8T, WS8U
W8RKO 80 (>1 to <=5 Hz):
AF4ZE, KA9SVR, KE0NRE, KE8AQW, KG5RMJ, N8TW, NF7R, NV3C, W6JBR, WA4BQM, WB2CMF
W8RKO 80 (>5 to <=10 Hz):
W8RKO 40 (<=1.0 Hz):
AA3I, AA6LK, AB4RS, AC8XY, AD5MT, AF9A, AG5AT, AJ4YA, K0BT, K0MZ, K0WM, K4PPK, K5CM, K5ND, K5RKS, K6LL, K7NG, K8YUM, KA5QEP, KA8BRK, KB2HSH, KD5FX, KD5MMM, KE6ZLX, KG6HSQ, KG6JDR, KM6QX, KN1H, M0MTQ, N1IRO, N3FM, N5IY, N5KAE, N6LKA, N7QXB, N7WS, N8OBJ, VA3MW, VE2IQ, VE3YX, W2FD, W2NMI, W2TX, W3FAY, W3JW, W4IVF, W5AJ, W6BM, W6DSR, W6SKD, W7SUA, W8AEF, W8EDU, W8WTS, W9FLA, W9GR, W9TN, WA2DVU, WA5UCW, WA7BNM, WB3JFS, WQ8T
W8RKO 40 (>1 to <=5 Hz):
KD8RV, KD9VUY, KE0NRE, KM1P, N5LUL, NF7R, NV3C, W9ZB, WA4BQM, WB8REI
W8RKO 40 (>5 to <=10 Hz):
|Method: TS-590S transceiver, Trimble GPS Receiver for calibration, WSJT-S software in frequency cal configuration.|
Soapbox: Enjoying ham radio and the FMT challenge.
|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, though this time I just used the display as a sanity check.
Soapbox: Thanks Michael and Connie for running the event. Generally good signals this time, easy measurements though there was instability mostly on 80m.
|Method: 98' long W5GI dipole oriented E-W connected to Icom IC-7000 (CW mode). SignaLink interface to laptop running Spectrum Lab. During call up, adjusted a GPSDO (Trimble Thunderbolt) referenced, HP 3335A frequency synthesizer to about the same frequency. After key-down, switched the radio input to the synthesizer (through an adjustable attenuator) and adjusted the synthesizer to the same frequency as seen on the waterfall. Read each frequency directly off the synthesizer. No radio or computer sound card calibration is needed with this method, but warmed both up for several hours so they were stable during the FMT.|
Soapbox: Heard NO signal at all from W8RKO on 40m.
|Method: Tuned using HP3586B Locked to Trimble Thunderbolt frequency reference. Sampled IF with computer soundcard and analyzed using SpectrumLab. Calibrated sound card frequency with signal from HP3336C locked to 10 MHz reference. Threw in a little bit of fudge factor from comparing to CHU.|
Soapbox: W8RKO 40m frequency was nearly inaudible but SpectrumLab pulled it out, although it was spread over a couple Hz. K5CM's signal started reasonably strong but faded some during key down. Both 80m signals were very strong. Going with a quick analysis for tonight's measurements.
|Method: Fldigi (flrig control) and ICOM-7610 with a 70 ft tower with a 40m beam (160 ft run of RG/8U coax) and a Leo Bodnar GPSDO.|
Soapbox: Second of one of three stations for the Case Amateur Radio Club (W8EDU). A mathematician, a physicist, and an engineer walked into a ham shack.
|Method: FTDX101MP/ SDRplay RSP2 cal. with WWV|
Soapbox: NO signals on 40M with either station ....all noise
|Method: Kenwood ts-890 w/ 10 MHZ reference signal, mag loop, wsjt-x|
Soapbox: Good signals. Thanks to both stations for setting up this FMT.
|Method: Flexradio 6300 & WSJT-X to measure offsets of WWV (2.5 & 5 MHz) and CHU (3.33 MHz).|
Soapbox: Indoor antenna (outdoor antenna lowered in prep for tropical storm tonight/tomorrow).
|Method: Receiver was Mercury SDR. Frequency measurement using WSJT-X. Freq reference OCXO calibrated to WWV and CHU.|
Soapbox: 40m was difficult! Signals in the noise. W8RKO was barely visible in the waterfall. K5CM was even weaker, had to guess when he went to the key down mode. Also there was an interfering signal almost exactly on frequency for a few seconds. 80m signals were good!
|Method: Flex 6600M w Internal GPSDO|
|Method: i used my K3s and the spot function. i lost my dipole during a storm a few |
weeks ago, so my antenna was an EFLW I've been testing. i used a spreadsheet for the corrections.
Soapbox: i had trouble hearing W8RKO on 40M; 80M was strong. K5CM is usually strong into NC. i always look forward to the FMT each Fall and Spring. Thank you.
|Method: IC-705 and FLdigi|
Soapbox: 40m signals were weak here. No copy on W8RKO, Weak K5CM.
|Method: Flex-5000, GPSDO, WSJT-X|
|Method: Drake TR7 tranceiver receiver; Icom 7300 used as reference frequency into a Heathkit IM-4100 counter clocked with a HP 10544A OCXO in a homebrew controller.|
Soapbox: I tune the signal with a Drake TR7 producing a reasonable audio pitch. The IC-7300 produces the reference frequency that is tuned to the TR7 audio pitch by ear. The HP 10 Mhz OCXO is coupled to the IM-4100 clock oscillator to improve its accuracy. On the day of the FMT the HP OCXO is zero beat tuned by ear to WWV at noon. Thank you Mike and Connie for providing your signals for this fun exercise. Signal levels; 1st run S-10, 2nd run S-20 to S-25, 3rd run S-10 to S-14, 4th run S-15 & QSB.
|Method: Set up is a Yaesu FT-1000MP Mark V, 40-meter dipole, Fluke 8845A multimeter as an audio frequency meter. Calibrated the receiver with a Bodnar GPSDO. 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: The K5CM-K0WM MUF was only 5.4 MHz so 40-meter signals were almost nonexistent. Strong K5CM signal on 80 meters and for W8RKO on both bands. Thanks to Connie and Mike for continuing support of this interesting event.
|Method: Calibrated my Icom-7300 using the 5.000 MHz WWV signal and used FLDIGI to make my measurement during the event. The difference between where the WWV calibration tone appeared on the graft and the location of tones received during the FMT was either added to or subtracted from the radios dial freq.|
Soapbox: I had a great time. Thanks to both of you. Both 40 meter tones were down a bit but the 80 meter signals were excellent here in Florida.
|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 signal was already skipping over my Oklahoma QTH. His signal was split in to two components about .6Hz apart. As a general rule the real signal frequency will be higher near sunset, so I picked the higher of the two. Mike's 80 meter signal was much stronger with little apparent Doppler,much easier. 73, Connie / K5CM
|Method: IC-9100 and WSJT in Freq Cal mode. Calibrated one hour before the test against on-air standard frequencies.|
Soapbox: All four transmissions were received. But K5CM's 40-meter signal had severe CW QRM within a few Hz of the carrier. I couldn't get a solid frequency measurement on WSJT.
|Method: I injected signal from HP3336B into antenna using a T connector. Then I measured the audio tones from the receiver for the off-the-air signal and the injected signal. Then I used homebrew Fast Fourier Transform software to obtain the audio tones from the receiver.|
Soapbox: 40 meters signals from both K5CM and W8RKO were NIL and S2 respectively. I looked over the FFT bins from the receiver to try to see if I could detect any signal on 40m for K5CM, but I couldn't dig anything out from the noise.
|Method: K3 in CW Mode, WWV, Spectrum Lab SW, Spreadsheet.|
Soapbox: I have to relearn this process every time. This time I'm going to document the process better to make it easier in the future. I think I see a way to make it easier afterwards. All four signals were good, and WWV signals at 10, 5 and 2.5 MHz were also good.
|Method: IC-7610 using internal standard, 43' vertical, FLDIGI Freq Analysis mode and lots of time spent trying to model ionosphere corrections.|
Soapbox: After bragging to NF7R how straightforward I'd made the measurement process, I couldn't get hands and brain to work together during the 40M runs but I hope I managed something. Both K5CM and W8RKO sigs were weak here on 40, antenna maintenance would probably have helped.
|Method: IC-7300 calibrated to several standard freqs.|
Counting beats method against audio oscillator.
Soapbox: 40 Meter signals too weak to measure in Michigan.
Occasional malicious QRM.
|Method: Used SA44B USB SA in zero span mode as IQ recorder, recorded in 3 kHz BW (centered at nominal callup freq), then shifted signal peak (nearest bin) down to zero IF and filtered recording down to 1 Hz BW (using FFT) before extracting phase. Measured slight residual phase slope to obtain final freq correction. Antenna was a DXE broadband amplified loop (inside house), oriented in plane running roughly NE to SW.|
Soapbox: Could possibly hear K5CM's 40m callup very intermittently, no real copy. Could not find his 40m key down signal at all (perhaps outside my 3 kHz IF passband?). Other signals heard well enough to work with. 'Twas great fun, as always. My QTH tends to be very much on the noisy side.
Soapbox: Excellent FMT run.
|Method: Receiver ICOM R9500, audio was recorded and analyzed with a Mathematica notebook I wrote. This includes displays of frequency vs. time on a contour plot, displays of the chirp Z transform and a histogram of the frequencies.|
Soapbox: Signals on 80m were good without much Doppler. On 40m signals were very weak, and I didn't think I had much of a chance of getting anything useful. However on the analysis, signals were seen to be quite good. I'll be interested to see how close I come.
|Method: IC-706MKII, Homebrew GPSDO (TNX Lars(SK), Marcus, & Mildrum), 80 Meter Inverted V, WSJT-X, CHU, WWV, Excel|
Soapbox: W8RKO 40 Meter signal was weak, K5CM 40 meter signal not heard.
Both 80 Meter signals were readable but think Doppler was heavy.
|Method: Icom IC-735 with end fed random wire antenna with audio feed to Spectrum Lab for measurement.|
Soapbox: Heard no signal from either station on 40m.
Still had fun trying.
Thanks to the FMT team for putting on this event.
|Method: Yaesu FT-817ND and fldigi on Windows 10|
Soapbox: W8RKO's signals were pretty weak in FN02. Connie's signals were decent with a little QSB. Thank you guys for providing the reference signals. It was fun as always.
|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: As was the case last November, I had no copy of Mike, W8RKO, on 40 meters. Connie was solid on 40, and both stations had good signals with minimal QSB on 80. The ionosphere was exceptionally stable with the Kp-index perhaps reaching as high as 1 during the FMT after flat-lining at 0 for much of the previous day. 73.000 de John, KD2BD
|Method: Method: FLEX6300 (no GPS) with fldigi FMT mode. Calibrated to local Bodnar Mini device.|
Soapbox: On 40 mtrs both W8RKO & K5CM were very weak, S5 just above the noise. On 80 mtrs both stations were +20 to 30 over S9.
|Method: FT-847, SpecLab, CHU for reference.|
Soapbox: hope I'm close. much interference on K5CM's 40m run.
73 all ..
|Method: Listen for call up and make initial keydown measurement with K3.|
Use GPSDO'd RSPdx SDR SAM DSB mode to resolve nearest tenth of Hz.
Observe CHU and WWV doppler offset and subtract.
Soapbox: So, so, so disappointed with the conditions on 40 meters. I had extremely marginal copy of W8RKO. The watery sound of What there as a signal sounded like I had a combination of his skywave and groundwave, and not enough of either! I did not hear that on either WWV or CHU at that time. And I'd like to kick the guy sending a series of 'Vs' and 'QRZ' over K5CM's 40 meter keydown.
Anyway, a big thank you and 73 to K5CM and W8RKO for the time and effort. It was fun (and a bit frustrating this time!). Looking forward to the next test!
|Method: ICOM 718; Signalink; FLDIGI.|
Soapbox: My first FMT. Had no reception on 40m.
|Method: FT-991A, heat-soaked and calibrated against WWV.|
Soapbox: New licensee; first FMT, done at Case Amateur Radio Club station W8EDU. Antenna failure during K5CM on 40 meters. Weak signals, need a better ionosphere for these. On order.
|Method: Antenna: 40m OCF dipole at 28 ft|
Freq. standard: Bodnar GPSDO
Computer: HP laptop
Software: FlDigi, Xcel
The IC-7300 was powered on for 8 hrs prior to the test to allow room and rig temperatures to reach a steady state.
The Bodnar GPSDO was set to the nominal test frequencies to determine the VFO offset error of the IC-7300 minutes before the test on each band.
Frequency was measured using FlDigi every 0.1 sec (approx. 600 observations during each 1-min run). FlDigi wrote measurements to a .CSV file.
Frequency measurements were imported into Xcel and sorted into ascending order. The central 200 measurements (approx. 1/3 of all readings) were averaged to arrive at the final frequency estimate. No correction was made for propagation disturbances.
Soapbox: Connie's 40m signal was very faint at my QTH. The rest were S9 or above.
|Method: Nooelec NESDR smart SDR, Ham it up converter v1.0(0.5 ppm TCXO upgrade), Distill am bandstop filter. Mega loop ant MLA-30. GQRX and Fldigi FMT on a HP Z800 Workstation running linux. WB0OEW variable frequency RF signal generator providing reference freqs . (UNK freq - REF freq) + REF freq. Results plotted and outliers removed. Mean of remaining measurements reported.|
Soapbox: All signals strong into San Diego. Thank you K5CM and W8RKO for sharing your time and expertise putting on this fine FMT.
|Method: Icom 756 and zero beating.|
Soapbox: First time participating. Screwed up the K5CM 40M, so I had to guess. Roll Tide!
|Method: FT-991A, FLDIGI and GPSDO (for reference signal)|
|Method: Model LM-18 Crystal Calibrated Frequency Indicating Equipment, type CBLC-74028 and a Hammarlund HQ-170 receiver. Used calibrator built into HQ-170 to zero the BFO, received signal, zero'ed LM-18 to the received signal. Used calibration book to extrapolate the measured frequency per equipment documentation. HQ-170 has an issue on 80m, so no report for 80m.|
Soapbox: Extra fun using LM-18, produced in 1943. Had to perform repairs on the power supply and learn to use the set. Frequency measurements were extrapolated from calibration book that is with the LM-18. Hope it's in the ballpark!
|Method: IC7300 calibrated with Bodnar GPSDO. Software fldigi in FMT mode.|
Soapbox: The K5CM signal on 40m was extremely weak. I'm in north Texas, so maybe too close for a good ionospheric bounce? Or maybe I just didn't find it correctly. However his 80m signal was strong. For the 80m W8RKO test I forgot to turn on recording during my measurements and lost the data, so I only have my dial frequency. Duh!
I have really enjoyed the FMT and look forward to the next one. Always learn something. Thanks to both K5CM and W8RKO for their generous efforts in making this available.
|Method: SDRuno, Fldigi|
|Method: FLDGI with IFR 1200 sync to GPS|
Soapbox: This is my first time participating in this event. It's a lot harder than I thought.
|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. It seems like it takes awhile for the Fldigi FMT tool to 'find' the transmit frequency -- I will want to experiment with other software in the future. The average recorded Doppler frequency shift was about .44 Hz at 5 MHz.|
Soapbox: This was my first time participating in the FMT, so I'm glad to just have been able to make (hopefully) reasonable measurements for all of the transmissions. I was in the K7UAZ University of Arizona shack for the event. A couple other students were also present to learn about accurate frequency measurements and the physics of the ionosphere. All of the signals were fairly strong.
|Method: KiwiSDR's controlled remotely via internet, fldigi for frequency analysis|
Soapbox: Operation of the SDR's was done by KM1P from the back seat of a Kia while N1BGA was driving south on the New Jersey Turnpike. Analyzed results in Philidelphia PA, Receivers were at N4DKD in Alabama and at KB1UIF in Massachusetts. Thanks to Gene KE6ZLX for inspiring this multi state sort of mobile operation.
|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: All strong signals here near San Francisco; around -80 dBm with -120 dBm noise floor, using ground level magnetic loop antenna.
|Method: IC-7300 and SW-facing EWE. Averaged samples of audio with Spectrum Lab, applied corrections and/or guesses. We'll see!|
Soapbox: As always had a wonderful time, thanks Michael and Connie for your hard work. W8RKO 40M signal here was almost unreadable, so my entry there is a wild guess. His 80M and both K5CM transmissions were 599. K5CM had an apparent intentional jammer on both bands but it couldn't compete with his great signal.
|Method: HP-Z3805A GPS, Rigol DG1032 reference RF injection with approx 1Khz offset, Kenwood TS-570D AM mode, Spectrum Lab, SDR Console/SDR Play , extraction of rogue results / averaging|
Soapbox: Enjoyable again .... enough to set alarm for 2:30am here in UK! Pretty weak signals especially on 80. Thanks Connie and Mike once again
|Method: AV-640 vertical, Elecraft K3 + P3 panadapter, awesome AMD Ryzen 7 PC.|
Used WSJT FMT utilities for frequency measurements calibrated through WWV, CHU, and WPHT pilot tones. The K3 was on for ~12 hours for temperature stability.
Soapbox: I took a new (to me) approach to this test. I got wind of Joe Taylor's FMT tools in his WISP package. Normally, I do the old 'zero beat' and Spectrum Lab flow but wanted to see how this experiment would work out.
Conditions were not that good at the QTH with a lot of static and some bozo interfering on 40 W5CM's attempt along with some deep QSB. I may have hurt my results but using USB for all measurements and the offset provided to the tools of 1500 Hz I think was incorrect; it probably should have been 600 Hz so results might be off by 900Hz. The resulting values did seem reasonable, however, but suspiciously very close to the advertised test frequency. Notice the values provided go down to milliHertz!
I don't have an 80m antenna so I had to use the 40m vertical. This obviously brought down the signal strength but the S/N was acceptable enough to get reasonable measurements as the test stations seemed to be strong on 80m.
I have a lot of doubt on my execution of this method as test day was the day I learned of WISP's capabilities for FMT support. Nothing like cramming for the exam last minute.
All and all a fun experiment and results will guide me to try again next time.
|Method: Kenwood TS-2000 referenced to Bodnar GPSDO, spectrum lab on computer.|
Second GPSDO used to calibrate before/after test.
Soapbox: 40m W8RKO almost non existent, so that one is a guess. Thanks for doing it, I look forward to every one!
|Method: K3, 40M dipole, WWV, Spectran|
Soapbox: Hvy QRM on W8RKO's 40M sig. Other sigs all OK. TNX agn to both ops for another great event.
|Method: FTDX10 in USB mode; WSJT-X. Manual averaging of minute3 values|
Soapbox: 55 years in Ham Radio, my first FMT! Technical issues interfered with 1st measurement. Minor gripe: Entry of measured frequencies above should be in order of measurement sequence. The entries on this form are upside down and backwards!
|Method: WSJT-X Frequency calibration. Plot measurements vs time; selected non-outliers to average|
Soapbox: Good strong signals received here in the Southwest.
|Method: IC746pro, WSJTX: Calibrated with WWV on 5, 10, and 15 MHz, took data for each run into text files, then imported to XL to get final answers.|
Soapbox: I think my calibration was wrong this year, but was still fun to exercise the brain cells! All four signals were strong on my various wire antennas. Thanks to K5CM and W8RKO for setting it up!!!
|Method: Yaesu FT-920 zero beat to WWV 5mhz to create fudge factor.|
Then use ears to zero in on W8RKO and K5CM.
Multiplied fudge factor by frequency displayed to get result.
Soapbox: That's my story and I'm stickin to it.
|Method: Win4Icom Suite spectrum waterfall to show signal, WSJTx, IC-7610 with GPSDO reference signal input, and wire dipole antenna. Calculated ionospheric variance by comparing received signals from WWV for fine-tuning.|
|Method: SDRplay RSPduo radio, calibrated to WWV before start of test, tuned using the down converted Aux spectrum display zoomed in for max resolution.|
Soapbox: Was able to measure all 4 transmissions. Oklahoma station stronger than Ohio.
|Method: Bodnar GPSDO through stepped attenuator to directional coupler to SDR-IQ RX input. Bodnar set to ~1000 Hz below received signal. Record I/Q spectrum via SpectraVue S/W for later analysis. Play back with AM demodulation recovering difference frequency for analysis with Spectrum Lab S/W.|
Soapbox: I set my recording file size to capture 5 minutes and start recording at call up. I had a hiccup and captured only 2 seconds of W8RKO's 80 meter call up. Tough to analyze this so my reading is a real SWAG. My fault, I usually use redundant receivers and recordings. Thought I would simplify this time. Doppler/multipath was a big problem on all frequencies, so maybe it didn't matter. I saw 20-30 dB QSB on all runs. Thanks Connie and Mike for putting on this show.
|Method: Flex-6500, HP Z3801A, 80M OCF dipole, FLDigi 4.1.18 in Freq Analysis mode|
Soapbox: Nasty QRM on K5CM 40M
|Method: FT-DX10 + MFTS + Fluke 6070A|
Soapbox: W8RKO-40M was very weak (< 3uV) at my QTH ... had to make assumptions. QRM with K5CM-40M, but was able to isolate enough signal to make it work I hope.
|Method: IC-7200, dipole, WSJT-X|
Soapbox: Thank you!
Soapbox: Sigs and condx were favorable. Can't blame them.
|Method: IC-7610 with small active loop antenna, using WSJT-X frequency calibration option and tools. Recorded signal peak centroid every 3 seconds during tranmission and took average. Observed a dip of 0.1 Hz from 03:03:39 to 03:49 for the W8RKO signal only. K5CM steady.|
Soapbox: Other duties called during the 40m transmissions, so no measurements for them. Thanks for the Test!
|Method: IC7300 + FLDigi, used time and freq station signals as control.|
Soapbox: Weak, fading signals except last 80 mtr run. Might use WSJT-X next time.
|Method: Flex 6600 with GPSDO module and WSPR software. I decode (and record) a 1500hz carrier for calibration. Then, during FMT, determine the carrier heterodyne and calculate for that value.|
Soapbox: I keep this as simple as possible following the procedures outlined in the original WSPR software. Calibration is completed using on air signals from WWV and CHU prior to the event.
|Method: Equipment: TS590S with 80m OCF dipole|
Signal Processing: Data collected with fldigi in "Freq Analysis" mode.
Data were processed in a home made program written in R. Measurements were filtered to within 1 standard deviation of the mean. Simple external calibration against 2.5, 3.33, 5.0, 7.85, and 10 Mhz reference stations was performed to correct for dial error. The calibration stations were measured for approximately 10 min each after the final FMT measurement. No correction for "Doppler" based biases was performed.
Results and estimated uncertainty:
k5cm 80m: 3599153.01 +/- 0.05
w8rko 80m: 3598003.32 +/- 0.01
k5cm 40m: 7065850.21 +/- 0.02
w8rko 40m: no measurement.
Soapbox: I'm an analytical chemist by trade so I used some code I already had on hand for filtering and analyzing data. I'm not sure how well this will work. I only remembered to turn on the radio 15 minutes before the first measurement.
I had great copies on every signal except W8RKO on 40m which was inaudible.
Can't wait to see how I did! :D
|Method: E-probe > TS-850 (CW) > soundcard. Measure audio near 800 Hz. Adjust for known offsets. Overnight run using GPS to measure external frequency standard.|
Soapbox: Thanks to Connie and Mike - this time I tried a new way to measure an 800-Hz-ish sinewave recorded at known samplerate. Not really needed for FMT, need a method to predict Doppler!
|Method: Same as Apr. TS-870 with Bodnar GPSDO replacing ref. osc. FLdigi in FMT mode. Guesswork with Doppler using Excel.|
Soapbox: Mike's 40 m signal was S5, quite weak. Mike's 80 m signal was S9+10. Connie's signals were both S9+15.
Thanks again! 73
|Method: ICOM 7100/audio signal generator/oscilloscope/frequency counter. The CW and Reverse CW audio outputs from the receiver are measured with the aid of an audio signal generator which is used to synch the oscilloscope sweep providing a stable near 600 Hz. display. The audio signal frequency is accurately measured with a frequency counter to provide frequency read out to 1/100 Hz. The receiver is calibrated using WWV as a standard as close to the measurement time as possible.|
Soapbox: Very Poor signals and noisy conditions from both stations on the 40-meter band. My entries for this FMT on 40 meters were largely guesses that the test signal frequency did not change from the call-up frequency. Very good signals from both stations on 80 meters. Thanks to W8RKO, W5CM and anyone from ARRL involved in providing the opportunity for another FMT. I always enjoy it even when conditions are not good.
|Method: Ten Tec Orion, MicroHam USB Interface w/Sound Card, Windows 10 PC, VA32 Audio Spectrum analysis SW in Frequency Analysis Mode with Statistical Analysis. Antenna is a HyGain HT18 Hytower|
Soapbox: Using vertical antenna for all runs. W8RKO signal noisy but readable on 40M, No copy on K5CM on 40M so no data entered. Good copy on 80M for both runs. 80M measurements should be my best runs.
|Method: I use a KWM-380 (modified) with a sound card and Spectrum Lab SW. All oscillators in the signal path are phase-locked to a GPS-disciplined 10 MHz oscillator. The radio is tuned to within 10 Hz of the signal by using the 'SPOT' function, and Spectrum Lab then shows the frequency difference between the signal and the displayed frequency.|
Soapbox: Both 40M signals were in the noise, part of which was due to rain static from Nicole.
Both 80M signals were better than 100 uV.
|Method: Elecraft K3 w/TCXO option; 30 Ft. vertical w/ATU; Spectran audio analysis software. Prior to test, established freq error correction factor against WWV (5, 10MHz) where Spectran measured the same 600Hz sidetone while toggling between CW and CW-R. During test, recorded K3 frequency where I measured the same 600Hz sidetone in Spectran (as with WWV) while alternating between CW and CW-R modes. Applied correction factor to recorded frequency for submission.|
Soapbox: K5CM and W8RKO had strong 80M signals. K5CM was also strong on 40M, however W8RKO was only fair. Always enjoyable.
|Method: Icom 7610 with hi-stability 10 MHZ xtal osc as reference into Spectrum Lab|
Soapbox: Doppler and multipath were about average (compared to other tests) Signals were good except for W8RKO on 40 (skip). 8RKO on 40M was S0 and barely detectable with Spectran and SpecLAB. 8RKO on 80 was S9 +20db. K5CM was S9 +20db on 40m and S9 +15db on 80M. Tnx to Connie and Mike for the effort!
|Method: GPS phase-locked reference injected into receiver input. Frequency delta measured with Spectrum Lab software.|
Soapbox: Lots of doppler. Thanks to all for the test.
|Method: HP3586B with QRP Labs GPSDO. Antenna 127 ft wire out the window with 9:1 balun. Locked in signal as close as possible during call up and used narrowest filtering available. Once steady carrier heard locked frequency then wrote down as many observations as possible on paper. Once test over took values with highest frequency of occurrence.|
Soapbox: Thanks guys - another great FMT! Thunderstorms from tropical depression moving up from FL caused a good many static crashes. Could not lock on W8RKO on 40M but no issues for K5CM or 80M.
|Method: Elecraft K3 with newer synth board and Spectrum Lab audio software.|
calibrated with 10mhz and 5mhz WWV
Soapbox: got double trace on K5CM 40M signal, bit odd. Not sure what that was or how to handle.
|Method: Flex 3000 calibrated with GPSDO, Fldigi.|
Soapbox: No copy on 40 m from either station at my QTH, most likely due to an antenna issue here.
Thanks to W8RKO and K5CM for a fun event!
|Method: GPS locked HP 3886B in counter mode. Antenna is 80M horizontal loop @ 20 feet.|
Soapbox: Performed the test as a club project for first time with a good time had by all. Disappointed in 40 M reception. 80 was strong enough for good measurements. Steve Ke5o
|Method: Hammarlund SP-600 + synthesizers|
Soapbox: Good signals, small doppler on 40, higher on 80, thanks
|Method: A log periodic antenna feeding an ESH-3 coherent receiver whose output was counted on an HP 11 digit counter all controlled by a Windows PC via an IEEE-488 interface. Both receiver and counter are locked to a GPSDO. Data reduction was accomplished with Excel doing a linear least-squares fit.|
Soapbox: All noise was around -109 dBm on both 40 and 80. 7064 kHz signal was around -79 dBm, 7065 around -74 dBm, 3598 around -69 dBm, and 3599 around -60 dBm, all strong signals here in northern California. I had a number of signals over and under the test signals on 40 meters - sure makes it more fun to get an accurate estimate. Thanks to the sponsors for a great FMT.
|Method: Stock FLEX 3000 SDR Transceiver running current version of PowerSDR by KE9NS. The transceiver was warmed up for at least 1 hour prior to the FMT. I calibrated it to WWV/WWVH at 15 MHz within 1 minute of each FMT run. I tuned to the FMT carrier in SAM mode.|
Soapbox: This was my first attempt at participation in a FMT. I chose to use my FLEX 3000 due to it having a stable TCXO, self-calibration capability, resolution to 1Hz, and excellent graphical interface.
I want to see if I can get within 1Hz reliably.
In the future, I am hoping to use more advanced methods to improve my measurement resolution to 10ths of a Hz.
73 de W6JBR
|Method: FlexRadio 6400M Fldigi Homemade GPSDO|
Soapbox: Trial run using my homemade GPSDO. I used fldigi to measure the offset of the test tone versus the GPSDO frequency synthesizer. 80m was noisy, especially K5CM. Stressful but fun. Need to make a checklist so I don't forget procedures in the heat of excitement.
|Method: RSP1A SDR. Indoor wire antenna. Same setup as last FMT.|
Soapbox: My worst FMT. Fell asleep before W8RKO's 40M test! K%CM's was almost inaudibly weak. Never heard any 80M transmissions. Is it my SDR, my antenna, or just me? Probably me. Still enjoyed it.
|Method: Non-GPSDO locked Elecraft K3 with Yagi on 40m and 160m OCF Inv-V on 80m. GPSDO Sigent SDG-2042x sig gen as reference for the fldigi FMT modem offset about 400 Hz from the target frequency. Rural area.|
Soapbox: Good signal strength on all 4 transmissions but plotted curves showed considerable frequency variation during each one minute run. Perhaps due to splitting of the received signal in the frequency domain? Some QRM on the target frequencies but the FMT tracking loop seemed to follow fine. K5CM's 40m signal here showed slow drift higher in frequency during the 1 minute run! The fldigi FMT measurement modem takes out the slow K3 TCXO drifting but when the target signals split in the frequency domain it makes it hard I think for the FMT modem to pick which peak to follow! Thanks Mike and Connie for the opportunity to measure your frequencies.
Soapbox: Next time I WILL get it right (yeah, right!!)
|Method: IC-7610 on GAP Titan with 200ft of DXE-400MAX using a Leo Bodnar frequency ref GPSDO, Fldigi, Flrig, and appropriate calibrations|
Soapbox: We did the test on 3 rigs and will be submitting on 3 operators. Our hope is that this submission is accurate.
|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 4.1.23.|
Soapbox: 40 m was terribly long for these signals, and were barely audible. I think that I might have made measurements on 40 m. Signals on 80 m were of course strong. I have more confidence in my 80 m measurements.
|Method: FlexRadio 6500 locked to Trimble GPSDO, Denon SD card digital audio 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: W8RKO had a nice strong signal here on the west coast this time. FMT is always fun. By the way, WSB AM 750 kHz in Atlanta GA has been GPS locked since early this year in case anybody wants to experiment with medium wave measurements.
|Method: ANAN-7000DLE MKII and Bodnar Mini GPS for reference using FLDigi's FMT mode.|
Soapbox: No luck hearing 40M at all for either tx. On 80M W8RKO was pretty stable showing 50mHz standard deviation so high hopes of being pretty close on that one.
K5CM had a lot of Doppler and 247mHz standard deviation so still hope to be < 1Hz there (3 sigma should cover it unless I was on a bad Doppler section).
|Method: After years of success with the heterodyne/Spectrum Lab method, decided to throw caution to the wind and look at IQ data directly with homebrew Python script. IQ data recorded from GPSDO referenced IC-7610 with HDSDR calibrated with referenced HP 3335A. Very fun to learn this signal processing stuff! Have several ideas for improvement.|
Soapbox: As others have noted, 40m signals were much lower SNR than 80m. Did copy Mike well enough to make a reading even though 40m was a little long for here in IN. Signals were booming on 80m from both Mike and Connie. Had some good peaks in the FFTs with very low std deviation. Thanks Mike and Connie once again for a great job.
Soapbox: W8RKO signal very weak on 40, fine on 80. K5CM fine on both frequencies, but had deliberate CW QRM on 40. Had fun anyway. Thanks guys!
|Method: Icom-7300 calibrated with a Bodnar, using Fldigi recording FMT and Bodnar used as a fixed reference signal.|
Soapbox: I did not receive either of the 40m signals. I think they were skipping over NC. Both signals on 80m were strong. Some Doppler was affecting the signal of K5CM. I enjoy doing this Bi-yearly FMT testing, forces me to check the calibration of my rig! Thanks Connie and Michael for the time doing the FMT for us all. 73 Eric/wa1sxk
Soapbox: K5CM 10/9, W8RKO weak. Thanks to all for the FMT
|Method: K3 with dual receive. One on Unknown, one on REF (WWV 5 MHz) into fldigi in FMT mode|
Soapbox: K5CM 80M very variable frequency despite WWV being rock solid here in VA
|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. Verified receiver calibration with WWV and other reference stations.|
Soapbox: Both 40m signals were weak but steady into New Mexico. The 80m signals were much stronger. Noted strong interference about 20 sec into K5CM 40m key-down. Thanks to Connie, Mike, and ARRL for making this event possible. I would enjoy having FMT events four times per year.
|Method: Receiver: Icom R-8600|
Antenna: SteppIR DB-36 option at 70 ft - used 40m setting for both bands
GPSDO: Jackson Labs Fury
Software: Fldigi 4.1.08
Used GPSDO as external frequency reference for R-8600.
Averaged Fldigi measurements during key-down period.
Soapbox: Thanks to K5CM, W8RKO and the ARRL. All signals easy copy.
|Method: IC-7851 + GSPSDO with FLdigi in FMT mode.|
Soapbox: W8RKO is too close and almost in noise for me. Saw ionosphere jumps of 0.2 Hz on 40. Will probably go back to using VA64 to read frequency next FMT as it has statistics and not a graph.
Soapbox: Conditions were good on both bands. I had fun no matter what the outcome is. Thanks to K5CM and W8RKO for their FMT efforts.
|Method: Kenwood TS-2000, HF6V vertical, Spectrum software.|
Soapbox: Signals were strong on all bands with very little to no dopplar. The low bands were exceptionally stable with increased solar activity.
|Method: antenna: vertical, receiver: Flex 6400, reference: GDO, synthesizer: HP3336B, software: WSJT-X|
Soapbox: W5CM was not even seen on the waterfall on both bands. W8RKO had a good S9 signal on both bands. Operator error on 40 so the only good submission was on 80. Sad. Better luck next time!
|Method: FLDIGI,ICOM IC-718, HP 8935. 40m dipole, 80m dipole|
Soapbox: 40M signals very noisy in NW OHIO with QRM. 80M signals strong. Thanks for doing it! Always learn something new and always have a great time!
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.
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.
Soapbox: Thank you K5CM and W8RKO.
|Method: Flex5000 with fldgigi. Compared to wwv at 5mhz and 10 mhz.|
Soapbox: method box cleared when form was rejected for error