April 22, 2010
Actual Radio Frequencies (Hz):
W8KSE/K5CM/WA6ZTY/W6OQI All (<=1 Hz):
AA6LK, AB4RS, K0ANS, K1GGI, K1JT, K3JQ, K5XL, K6HGF, K6IQL, K6OQK, K9KK, KA1BQP, KB5YZG, KF4MH, N3FG, N5DM, N7EP, N9MVO, NO5K, VE2IQ, VE3OAT, VE3ZRK, W0HBK, W1PW, W3JW, W4UK, W6BM, W7KXB, W8MIF, W8TM, W9TJ, W9ZB, WA1ABI, WA2SON, WA4FJC, WB0LXZ, WB3AKD, WB9FIP
W8KSE 80 (<=1 Hz):
AA6LK, AB2WB, AB4RS, K0ANS, K1GGI, K1JT, K3JQ, K5CM, K5XL, K6APW, K6GZA, K6HGF, K6IQL, K6OQK, K6RFK, K9KK, KA1BQP, KB5YZG, KD2BD, KF4MH, N0KQY, N3FG, N5DM, N7EP, N7KC, N9MVO, NO5K, VE2IQ, VE3OAT, VE3ZRK, VE7TK, W0HBK, W1PW, W2FD, W3JW, W4UK, W5EMC, W5PDB, W6BM, W6EMC, W6IHG, W6OQI, W7KXB, W8BL, W8MIF, W8TM, W9TJ, W9ZB, WA1ABI, WA2SON, WA4FJC, WA7MHB, WB0LXZ, WB3AKD, WB9FIP
W8KSE 80 (>1 to <=5 Hz):
AA8K, K4BSD, K7ET, KB3VR, N8TD, N9CYL, WB4LII
W8KSE 80 (>5 to <=10 Hz):
W8KSE 80 (>10 Hz):
K6BZZ, KB4ZVM, KK5J, N2GL, VE4OV, W3PR, W7JDE, W7OZ, WA2USJ
W8KSE 40 (<=1 Hz):
AA6LK, AB4RS, K0ANS, K1GGI, K1JT, K3JQ, K5CM, K5XL, K6APW, K6BZZ, K6HGF, K6IQL, K6OQK, K7ET, K9KK, KA1BQP, KB5YZG, KF4MH, N2CUA, N3FG, N5DM, N7EP, N7KC, N8TD, N9CYL, N9MVO, NO5K, VE2IQ, VE3OAT, VE3ZRK, VE7TK, W0HBK, W1PW, W2FD, W3JW, W4UK, W5EMC, W6BM, W6EMC, W6IHG, W6OQI, W7KXB, W8MIF, W8TM, W9TJ, W9ZB, WA1ABI, WA2SON, WA4FJC, WA6ZTY, WB0LXZ, WB3AKD, WB9FIP
W8KSE 40 (>1 to <=5 Hz):
AA8K, AB2WB, KB3VR, N5LUL, VE4OV, WA7MHB
W8KSE 40 (>5 to <=10 Hz):
W8KSE 40 (>10 Hz):
K4BSD, K6RFK, KB4ZVM, KK5J, N0KQY, N2GL, W3PR, W5PDB, W7JDE, W7OZ, WA2USJ, WB4LII
K5CM 80 (<=1 Hz):
AA6LK, AB2WB, AB4RS, K0ANS, K1GGI, K1JT, K3JQ, K5XL, K6APW, K6BZZ, K6GZA, K6HGF, K6IQL, K6OQK, K6RFK, K9KK, KA1BQP, KB5YZG, KD2BD, KF4MH, N2CUA, N3FG, N5DM, N7EP, N9CYL, N9MVO, NO5K, VE2IQ, VE3OAT, VE3ZRK, VE7TK, W0HBK, W1PW, W2FD, W3JW, W4UK, W5PDB, W6BM, W6OQI, W7KXB, W7OZ, W8BL, W8MIF, W8TM, W9TJ, W9ZB, WA1ABI, WA2SON, WA4FJC, WA4OBJ, WA6ZTY, WA7MHB, WB0LXZ, WB3AKD, WB9FIP
K5CM 80 (>1 to <=5 Hz):
AA8K, K4BSD, K7ET, KB3VR
K5CM 80 (>5 to <=10 Hz):
K5CM 80 (>10 Hz):
KK5J, N2GL, N5LUL, N7KC, VE4OV, W7JDE, WA2USJ
K5CM 40 (<=1 Hz):
AA6LK, AA8K, AB2WB, AB4RS, K0ANS, K1GGI, K1JT, K3JQ, K5XL, K6APW, K6BZZ, K6GZA, K6HGF, K6IQL, K6OQK, K6RFK, K9KK, KA1BQP, KB5YZG, KF4MH, N2CUA, N2GL, N3FG, N5DM, N7EP, N9CYL, N9MVO, NO5K, VE2IQ, VE3OAT, VE3ZRK, W0HBK, W1PW, W2FD, W3JW, W4UK, W5EMC, W6BM, W6EMC, W6IHG, W6OQI, W7KXB, W7OZ, W8BL, W8MIF, W8TM, W9TJ, W9ZB, WA1ABI, WA2SON, WA4FJC, WA4OBJ, WA6ZTY, WA7MHB, WB0LXZ, WB3AKD, WB9FIP
K5CM 40 (>1 to <=5 Hz):
K7ET, KB3VR, KK5J, VE7TK, W5PDB
K5CM 40 (>5 to <=10 Hz):
K5CM 40 (>10 Hz):
AB2IO, K4BSD, N0KQY, N5LUL, N7KC, W7JDE, WA2USJ, WA6VPJ
WA6ZTY 40 (<=1 Hz):
AA6LK, AA8K, AB4RS, K0ANS, K1GGI, K1JT, K3JQ, K5CM, K5XL, K6BZZ, K6GZA, K6HGF, K6IQL, K6OQK, K6RFK, K7ET, K9KK, KA1BQP, KB5YZG, KF4MH, N0KQY, N2GL, N3FG, N5DM, N7EP, N7KC, N9CYL, N9MVO, NO5K, VE2IQ, VE3OAT, VE3ZRK, W0HBK, W1PW, W2FD, W3JW, W4UK, W5EMC, W6BM, W6EMC, W6OQI, W7KXB, W7OZ, W8MIF, W8TM, W9TJ, W9ZB, WA1ABI, WA2SON, WA4FJC, WA4OBJ, WA7MHB, WB0LXZ, WB3AKD, WB9FIP
WA6ZTY 40 (>1 to <=5 Hz):
K4BSD, VE7TK, W5PDB
WA6ZTY 40 (>5 to <=10 Hz):
WA6ZTY 40 (>10 Hz):
AB2IO, K6APW, KK5J, VE4OV, W7JDE, W8BL, WA6VPJ
W6OQI 80 (<=1 Hz):
AA6LK, AA8K, AB4RS, K0ANS, K1GGI, K1JT, K3JQ, K5CM, K5XL, K6APW, K6BZZ, K6GZA, K6HGF, K6IQL, K6OQK, K6RFK, K7ET, K9KK, KA1BQP, KB5YZG, KD2BD, KF4MH, N0KQY, N2GL, N3FG, N5DM, N7EP, N7KC, N9MVO, NO5K, VE2IQ, VE3OAT, VE3ZRK, VE7TK, W0HBK, W1PW, W3JW, W4UK, W5EMC, W6BM, W6EMC, W7KXB, W7OZ, W8BL, W8MIF, W8TM, W9TJ, W9ZB, WA1ABI, WA2SON, WA4FJC, WA4OBJ, WA6ZTY, WA7MHB, WB0LXZ, WB3AKD, WB9FIP
W6OQI 80 (>1 to <=5 Hz):
K4BSD, W2FD, WA6VPJ
W6OQI 80 (>5 to <=10 Hz):
W6OQI 80 (>10 Hz):
KK5J, VE4OV, W5PDB, W7JDE
W6OQI 40 (<=1 Hz):
AA6LK, AA8K, AB4RS, K0ANS, K1GGI, K1JT, K3JQ, K4BSD, K5CM, K5XL, K6BZZ, K6GZA, K6HGF, K6IQL, K6OQK, K7ET, K9KK, KA1BQP, KB5YZG, KF4MH, N0KQY, N3FG, N5DM, N7EP, N9CYL, N9MVO, NO5K, VE2IQ, VE3OAT, VE3ZRK, W0HBK, W1PW, W2FD, W3JW, W4UK, W5EMC, W6BM, W6EMC, W7KXB, W7OZ, W8BL, W8MIF, W8TM, W9TJ, W9ZB, WA1ABI, WA2SON, WA4FJC, WA4OBJ, WA6ZTY, WB0LXZ, WB3AKD, WB9FIP
W6OQI 40 (>1 to <=5 Hz):
K6RFK, KK5J, VE7TK, W5PDB, WA7MHB
W6OQI 40 (>5 to <=10 Hz):
W6OQI 40 (>10 Hz):
K6APW, N2GL, N7KC, VE4OV, W7JDE, WA6VPJ
Result Details (n=77):
|Method: FT-847, 5BTV, HP Z3801, Marconi 2019, HP 5345A, Toshiba laptop w/ Vista, Speclab, Digipan; generator and counter sync'd to GPS; with receiver in USB mode, Digipan was used to spot incoming signal and generator was set to a nearby frequency; receiver switched to narrow AM mode and tuned to maximize beat audio; Speclab used for final measurement; when signals were strong enough, frequency counter readings of audio were captured and averaged later; results computed by spreadsheet.|
Soapbox: Was able to hear all stations; W8KSE very weak, 40M CW QRM, 80M QRN, and WA6ZTY also weak - relied on Speclab solely for these; K5CM and W6OQI both strong - used Speclab _and_ frequency counter for these, and had to decide which was _more_ correct - kinda like having two watches. Thanks to the whole FMT crew for a well-orchestrated operation. 73, L
|Method: I used only Open HPSDR, Thunderbolt GPSDO, and Spectrum Lab.
I offset HPSDR about 500 Hz to make an tone with its BFO, used PowerSDR to make a wave file. Play the wave file back on Spectrum Lab, note the offset from the HPSDR frequency. Antenna is a vertical about 20 meters high.|
Soapbox: Open HPSDR received signal levels in dBm: W8KSE 80m -77, W8KSE 40m -90, K5CM 40m -61, K5CM 80m -56, WA6ZTY 40m -69, W6OQI 40m -82, W6OQI 80m -102, WWV 5MHz -60, WWV 10MHz -60. Lots of fading on all frequencies. WA6ZTY's Doppler showed downward drift to me. The HPSDR is locked to the Thunderbolt. Used a different PC for Spectrum Lab and forgot to calibrate the sound card. Thanks guys for the FMT!
|Method: Kenwood TS-570D with indoor fan dipole.|
Soapbox: WA6ZTY had QSB at my QTH. Nothing heard on 80 m 73
|Method: ICOM 706MKIIG with 80-meter doublet; display calibrated using WWV; rig on for 3 hours prior to test to stabilize; zero-beat test signal with the aid of the Fldigi waterfall and adjusted for display error.|
Soapbox: As always, I greatly enjoyed the exercise. All W8KSE and K5CM signals were strong at my location. I recorded the signals for analysis with Spectrum Lab, as well, but I am not confident enough yet in my knowledge of this software to apply it to this test. I look forward to doing this next time. (I had to re-submit my results because I switched the 80 and 40 meter entry windows the first time--that would come up as a really big measurement error!)
|Method: HP 3336C frequency synthesizer referenced to 10 MHz from Trimble Thunderbolt GPSDO. Injected known reference signal near the test signal, and tuned it down to AF with a Yaesu FT-897d, that had been warmed up for several days. Used Spectrum Lab to sample the audio and calculate the frequency delta from the reference signal to the test signal. Antenna is a 6BTV, with not enough radials.|
Soapbox: This is my first FMT, and I enjoyed it tremendously. All transmissions were loud and clear except W6OQI on 80m, which was weak, but readable. Looking forward to the next one.
|Method: Yaesu FT-817 with TCXO, Apple iMac running CocoaModem 2.0 in PSK mode. Set the receiver to USB, 1kHz below the announced frequency. Center the PSK tuning indicator on the signal. Add the radio and audio frequencies. Measure WWV the same way and correct all measurements proportionately.|
Soapbox: I also used a Yaesu FT-897 with fldigi 3.12.5 on the iMac in Freq Analysis mode. Fldigi offers 0.01 Hz precision, but the low order digits jitter too much for an accurate reading.
|Method: Heterodyne with accurate signal generator, measure AM beat with SpectrumLab.|
Soapbox: Good copy on all stations, and no QRM at all. Thanks to all who put this fmt on the air.
|Method: Equipment: stock Kenwood TS-2000; computer with motherboard sound system; command-line software "FMT.EXE", written specifically for the Frequency Measuring Test. No local frequency standard.
Procedure: carriers of WFAN (0.660 MHz), WCBS (0.880) WCAU (1.210), WWV (2.500, 5.000, 10.000), and CHU (3.330, 7.850) were used as over-the-air frequency references. Program FMT sets the TS-2000 dial 1500 Hz below each calibration frequency and samples audio output to enable measurement of dial error by computing FFTs. Then it measures the offset of each test signal from its nominal frequency, and finally does the full calibration sequence again. Internal consistency of data shows that measurement uncertainties are 0.2 Hz or less.|
Soapbox: All signals were S7 to S9+ here in NJ except W6OQI on 80m, about S4. Still plenty of signal for good measurement. QRN from regional thunderstorms, but I don't think it affected results much. Great fun, thanks for organizing the test!
|Method: IC-756Pro III, Carolina Windom 80 Short at 60 feet high, RigExpert Plus Audio Interface to 2.8GHz Dell PC running Spectrum Lab.
Transceiver, Interface, and Computer were turned on about 12 hours in advance. Spectrum Lab was not calibrated to the sound card, but system was calibrated to WWV at 2.5, 5.0, and 10 MHz with one measurement at 15 MHz. Separate calibrations were performed for USB and LSB modes by tuning slightly off-frequencey (1 kHz usually) and measuring the beat frequency with Spectrum Lab.
The calibration curves were obtained from linear least squares fits to the measurements. At test time, transceiver was tuned to give beat notes between 500 and 1500 Hz, and measurements made both in USB and LSB modes. Between transmissions, further calibration against WWV were performed. The USB and LSB mode measurements were separately corrected using the USB and LSB mode calibration curves.
The results presented are the average of the USB and LSB mode corrected frequencies.|
Soapbox: This is my third try at the frequency measurement test. Signals were good all around -- 59+15 from W8KSE and K5CM on 40 and 80, 59 from WA6ZTY on 40, 48 from W6OQI on 40, and 47 on 80m. To give you an idea of the expected error in the measurements, the rms difference between the raw USB and LSB mode frequencey measurements was about 0.6 Hz, and between the corrected USB and LSB mode frequencies it was about 0.3 Hz. I'm sure this can be improved when I understand more about the capabilities of Spectrum Lab. Just an observation: it takes only a relative velocity of 10 mph to produce a Doppler shift of 0.1 Hz at 7 MHz.
|Method: TS 430S Rcvr TS 530S into power divider then dummy load for reference "zero beat" source. Used HP 5328A Counter out of power divider.|
|Method: FT-1000D, GPS Reference HP-Z3801, HP-3336b, PTS-250.|
Soapbox: Signal were very good. Almost as if all the transmit stations had a clear channel. Mr Murphy stayed home, but Mr. Doppler made up for him in spades tonight. 73, Connie
|Method: FT-1000MP with TCXO tuned to produce approx 500 hz beat note fed to computer soundcard and measured with Spectrum Lab software. VFO was referenced against GPS diciplined local AM broadcast station KAAM 770 Khz.|
Soapbox: This was my second FMT test. Lots of doppler on most of the transmissions, but good copy.
|Method: Ten-Tec Argonaut V calibrated against WWV, digital audio generator and audio hybrid combiner to detect beats.|
Soapbox: Signals ranged in-and-out of local noise to 50dB over S9.
|Method: HP-3336B with Thunderbolt GPSDO, FT-817 rcvr, attic 40 meter dipole, Spectrum Lab, laptop running XP.|
Soapbox: What a well run FMT! Outstanding. Thanks to those who put it on. You did a really good job.
|Method: I used a Hewlett Packard 3586C Selective Level Meter as a receiver connected directly to the antenna and operated in the counter mode.
The resolution is limited to 0.1 HZ using the technique.|
Soapbox: Lots of QSB and static made these measurements difficult to make with any great accuracy but I thought I would give it a shot. This is my first try and it was fun.
|Method: Thunderbolt GPS, HP 3586B, HP 3336B, Spectrum lab|
|Method: Synthesized RF reference offset by 400-500 Hz on low side of unknown to produce audio beat tone in receiver. Freq./Level of tone recorded and processed with Spectrum Lab and Excel. Tone frequency + RF reference should = unknown. In Excel tone amplitude was used to throw out measurements made during fades. Remaining data averaged to obtain beat frequency. Equipment- Collins 75A4 used to receive signals using 800 HZ BW. Rb frequency standard used to externally reference both generators and counter. Hp5345A counter, Fluke 6070 synthesizer, Fluke 6062A synthesizer, Tek 475 scope, 2 old PCs running Spectrum Lab. Spectrum Lab sample rates calibrated at 400 Hz prior to test by beating two synthesizers with each other into receiver. 400.000 Hz verified with HP 5345.|
Soapbox: Many thanks to W8KSE, K5CM, WA6TZY, W6OQI, and ARRL for a superbly run FMT. The format of the test was great and I would like to see it used again in the future. A FMT every 6 months might keep the interest up. All signals were 5-9 to 5-9++ here in Kansas. Doppler present. My first FMT - Lessons learned: A. I recorded entire test in one .wav file. Post processing would be easier with one file for each test frequency. B. Fades would be easier to detect in post processing with receiver AGC off or AGC range reduced with RF gain control. This was great fun and I look forward to the next one. 73 John K6IQL
|Method: I use a GPS Referenced HP-3586B with its 15625 I.F. fed to the vertical input of a scope, and the horizontal input fed with a GPS Referenced HP-3336Bfor a 1:1 Lissajou. I also have Spectrum Lab monitoring the 15625 I.F. frequency, feeding my laptop, which has been calibrated to Spectrum Lab. The antenna is an Inverted-V 105' on a side with Apex up 40' in a Pine Tree. See: http://www.k5cm.com/k6OQK%20FMT%20NEW.htm for more specifics.|
Soapbox: W8KSE was weak on 40-Meters and just above the noise on 80-Meters. K5CM's signal's were good but with a considerable amount of Doppler. WA6ZTY must've been hiding in my back yard, really great signal here in Glendale, CA. W6OQI is in my back yard, about 8 miles away. Thanks to the gang at the ARRRL for sponsoring this FMT. Less confusion than previous FMT's with signals for everyone across the country and possibly elsewhere. Great going Gang!!! Burt, K6OQK
|Method: Agilent Z3805 GPS locked 10MHz reference fed to HP 3336B Sig Gen beat against signal in R75 receiver.|
Soapbox: Weak signal from W8KSE. Was able to detect an ionospheric height shift on W6OQI. (I think I misrecorded the frequency for OQI on 40 M as there is a digit missing.
|Method: Stock Flex-5000A, using Panadapter and Scope modes. Radio stays on 7/24. WWV Calibration check between most of the measurements.|
Soapbox: 1st FMT. Had a ball. Hope to have some improved skills before next year's FMT.
|Method: GPS disciplined HP RF generator and Spectrum Lab.|
Soapbox: Great fun. Looking forward to next one. Very good signals except W6OQI 80M which was buried in the noise in Central Oklahoma.
|Method: Lucent RFG-M-RB Rub, IFR-1500S, Speclab Software|
Soapbox: Signals readable from all stations, Marvin was a tad weak.Tnx to W8KSE,K5CM,WA6ZTY,W6OQI
|Method: Yaesu FT-897, Spectran, WWV and CHU standards|
|Method: I used an Icom 706 with the display set for 1 Hz precision. The antenna was a long wire (about 90 feet) with an SGC-230 autotuner. I connected the fixed audio output of the transceiver to the line level input of the sound card on a Pentium 4 computer, and ran Digipan software. I calibrated the transceiver by setting the "CW Tone" to 600 Hz, and tuned to WWV with the transceiver set to "CW" mode. I then carefully adjusted the tuning until the Digipan software indicated that the heterodyne tone was 600 Hz. The Icom display indicated between 37 and 38 Hz high. Interpolating as closely as I could, I determined that the transceiver frequency display was 37.2 Hz high. I then repeated this procedure with the test signals, subtracting 37.2 Hz from the displayed frequencies to obtain the results I reported.|
Soapbox: Once again, this was very educational and fun! I learn more each time I participate in the FMT. I'm looking forward to seeing the results. I hope I'm a lot closer than I was the last time, and I hope we have many more Frequency Measurement Tests!
|Method: Longwire antenna (35ft)
JRC NRD-545 DSP Receiver with TCXO.
Signal Link Sound Card,
Dell Laptop Computer & MixW software.|
Soapbox: DE KB5YZG: JRC was set in narrow CW mode with BFO set to 1000Hz. Line out audio from radio into Signal Link soundcard to USB input to MixW in laptop.. After 6 hour warmup, calibration obtained to less than +/- 0.2 Hz using WWV and CHU for RF freq standard. MixW was running in PSK mode with display set in spectrum mode (inverted & average) providing very sharp (analog) amplitude spike of the BFO audio signal measuring & reading the observed BFO tone in the digital display at bottom of the MixW window. Formula: Actual Transmit freq (Hz)=(observed BFO tone -1000.1) + dial freq (Hz) .'73.
|Method: All homebrew equipment including a quadrature phasing direct conversion receiver, WWVB referenced frequency standard, frequency counter, and H-field loop antennas. Method involved phase locking the receiver's LO to the frequency of the unknown carrier minus a 1 kHz offset. The carrier's frequency is determined by measuring the frequency of the receiver's LO over a 100 second integration period while factoring in the 1 kHz offset. Full details are available at: http://www.qsl.net/kd2bd/fmt-methodology.html|
Soapbox: The best ARRL FMT ever with so many stations participating. The Kp index was 1 resulting in fairly stable signal propagation conditions. W8KSE was 599 into NJ on 80. K5CM was unbelievably strong, while W6OQI was fairly weak, but stronger than previous FMTs. Got a chuckle from the unidentified station who sent "TU" after Marvin's 80-meter keydown period ended.
|Method: Icom 7700 operated in USB mode and tuned for a 1khz tone and measured the tone via MMVARI program with computer soundcard.|
Soapbox: Great signals from all stations and everyone was in the clear here in south Alabama.
|Method: HP 3586B SLM|
Soapbox: Had lots of fun! Learned a lot. Tuned by ear. First time to participate. Look forward to the next FMT.
|Method: Kenwood TS690S, HP 3325A using Trimble Thunderbolt GPS external time reference, Spectrum Lab.|
Soapbox: First time for the FMT here. There are many different ways to measure a received frequency making this a very useful exercise. Thanks to all those involved.
|Method: FT897D, Spectran, Spectrum Labs.|
Soapbox: Seems I may have written the W8KSE Dial freq down wrong. :( So, the only readings I hope are close are for K5CM. Which is interesting because there was a great deal of doppler and multipath on Connies signals. Thanks for the fun, 73, Randy
|Method: TS940S narrow AM filter, unknown incomming signal mixed in Merrimac 2/1 combiner with HP3335A w/tcxo opt001 synthesizer at same level to produce averaged +/-240Hz displayed on Tek 2245A triggered to 60 Hz line.|
Soapbox: First two measurments caught me taking too much time with poor propagation to west coast. Remaining signals no excuses. Next task is to find a GPS 10 MHz reference to cal the synthesizer. WWV is difficult to cal to with the tones, voice, and clicks. FUN!
|Method: IC-7200, Spectran, dipole|
Soapbox: Many thanks for a first class FMT. Well done.
|Method: Kenwood TS-480 40/80 dipoles and DigiPan v2.0|
Soapbox: All tranmissions QRM free...QRN/Doppler minimal.
|Method: Yaesu FT-920|
|Method: ICOM IC-746, WWV and Spec. Lab software|
Soapbox: Great FMT. Good signals into Washington State and a great schedule. Lots of doppler on the signals to level the playing field. Kept me buzy the whole time. Thanks N0AX and ARRL
|Method: Kenwood TS-570D on AM as beat detector working in center of audio passband. RF injection oscillator HP-8647 disciplined with Z-3801. HP-3561 dynamic signal analyzer, 1Khz center/10Hz span, for beat analysis. All receiver memories and oscillator registers pre-programmed for fast signal acquisition and aural 1Khz oscillator for quick zero beat.
Approx 75ft long wire antenna|
Soapbox: The Ohio signals were not so good in Seattle (for me) but still yielded a number. Good fun and I look forward to more.
|Method: SDR-1000 in AM mode using spectrum analyzer display. Calibrated to WWV at 10MHz. before and then after measurements.|
Soapbox: I had the receiver powered up less than an hour before the test and I measured 8 Hz low when I checked on WWV at10 MHz so I added 8 Hz to my measurements. I hope to improve my technique and my results next time.
|Method: Icom 746PRO with High Stability Crystal Unit warmed up for 4 days.
SpectrumView software by WD6CNF.|
Soapbox: Good conditions with little QSB and no QRM. Dozed off after the W6OQI 40 Meter test, and when I woke up the 80 Meter test was over.
|Method: Kenwood TS570S receiver audio sent to a Toshiba Portege 610 CT. I used the keypad to enter the frequencies, to eliminate display limitations, then compared the audio beat frequency in CW mode with what I got tuning in WWV at 2.5, 5 and 10 MHZ. Argo QRSS software on the Toshiba permitted audio frequency resolution better than 1 Hz.|
Soapbox: This is my first attempt at an FMT. I let the rig warm up for two hours before the test started, and saw the drift in WWV's beat frequency. Between FMT transmissions I rechecked WWV on each frequency to minimize the effects of drift. The California transmissions showed less frequency stability, because of the greater distance. It was an interesting couple of hours.
|Method: GPS locked BFO, FLEX 3000 as an AM receiver feeding 300 HZ BW 1 KHz audio filter into Spectrum Lab V2-7b12. Sanity check was with a GPS locked FLEX 3000's Cursor.|
Soapbox: This test was impressively run, like clockwork! Thanks to all the Reference Stations, Job Well Done!!! Signals were all 10 to 40 dB above the noise here in Central Texas. W6OQI did drop to about 3 to 6 dB over the noise toward the end. I’m glad I could work this one, it was really fun. Frankly things did not work as I expected and I still don’t feel confident with SL. GPS locking the FLEX was a wasted effort because of resolution but having it was a nice confidence check. All my calculated data fell within 6.4 to 19.2 Hz of the FLEX. OH! The BFO was a GPS locked HP 8920B. I’m looking forward to the next one. De NO5K
|Method: dipole ant, TS-850 clocked by ext gps-disciplined std, sound card, processed callup, keydown separately, averaged discarding values too far away from mean|
Soapbox: Excellent conditions, well-run FMT, tnx to everyone
|Method: Aged Sulzer quartz freq standard with decade divider chain to make 1 kHz markers for the receiver, and of course SpectrumLab software to make the frequency comparison.|
Soapbox: Propagation seemed decently stable for all runs except 80 m from W6OQI which was weak, "fadey" and noisy at my QTH.
|Method: IC-706 MII transceiver
Laptop with audio spectrum analyzer program.
R&S Signal Generator (SMY 01) using 10 MHz GPS reference.|
Soapbox: Also participating were: VE3BBM Ralph, VE3CZO Wayne, VE3TLY Dave. It was a fine FMTP! We were amazed and delighted to receive all stations, including those from California. We look forward to the next one. Bryan, Ralph, Wayne, Dave. All members of the Ottawa Amateur Radio Club.
|Method: I warmed-up my aging IC-765 for a few hours before the test and checked WWV and CHU on various bands. I did the FMT entirely "by ear" and did not use my computer and Spectrum Lab this time, to see what an entirely "old fashioned" method could achieve. My rig is only capable of resolving down to 10 Hz.|
Soapbox: My second FMT. The new 4-minute call-up and 3-minute key-down is a great system. Leaving a few minutes to compose yourself before the next part of the test is excellent. Thanks to the Experts who did all the work! All seven sigs were S5 to S8 here in southern Manitoba. vy 73, Rick Lord
|Method: Ten-Tec Orion tuned to WWV at 5 MHz. Zero beat with WWV at 5MHz showed the Orion was reading about 1 Hz high. I tuned in each source and after zero beat I used Spectrum Lab to see how close the tuned carrier was to 700 Hz. Based on WWV correction I subtracted 1Hz and then I used the audio frequency offset to "guess" at what was happening after the decimal- hi!|
Soapbox: It was nice to hear ALL stations this time! I almost did not find the zero beat signal for K5CM on 40 so I hope I'm close. Also of interest I found the Orion to be slightly high in frequency compared with 10 MHz WWV and slightly low at 5 MHz WWV. In both cases well within spec. Thanks to all the test stations. Enjoyed the test - 73!
|Method: FT-920, with calibrated TCXO, direct frequency measurement method.|
Soapbox: TNX to FMT coordinators!
|Method: Using FT-817nd calibrated versus Thunderbolt Disciplined GPS. 600 Hz tone out to Spectrum Lab. SL text output fed to Excel where the peak freqs are averaged and the calibration corrections are applied. Results from Excel file loaded into FMT Data Entry page.|
Soapbox: W8KSE was 569/qsb on 80 meters, and 599/qsb on 40 meters despite some lids (at least two) who tried to QRM the 40 meter signal. K5CM was 599/qsb on both 40 and 80 meters. WA6ZTY was 589/qsb on 40 meters. W6OQI was 569/qsb on 40 meters, and 589/qsb on 80 meters. There was considerable Doppler on all signals on both bands throughout the entire test. My sincere thanks to all four of the stations who worked to set up and run this unique test; and my thanks to the ARRL for sponsoring it, and for dedicating a page of the April issue of QST to "get the word out" about the test.
|Method: Kenwood TS-450 with 1 Hz. resolution using fine frequency steps and miucrophone up/downcontrol and a frequency counter to increase the resolution when signals are good. Used CW/RCW for equal tones and offset frequency of 600 Hz. to get dial reading for CW frequency. Dial corrected at Fc = 15 Mhz, WWV frequency by using 15 MHz. dial setting and measuring delta F between normal receiver audio output and 600 Hz. Dial correction at frequency F is dial correction at Fc times F/Fc. similar measurements made for the transmitted FMT CW signal frequency F and dial correctiuons applied to get final frequency measurement result.|
Soapbox: Thanks again to Connie(K5CM), the members of the MW VHF/UHF Society(W8KSE), Mike(WA6ZTY) and Marvin(W6OQI) and Bruce WA7BNM. You all did a very fine job for the FMT. I was able to copy all stations but noisy conditions and fading made it difficult to get good measurements on the California stations. The most stable and strongest signal was from K5CM on 40 meters.
|Method: IC-7800 locked to 10 MHz GPSDO; IF BW set to 100 Hz
Into Spectrum Lab
Backup measurements taken with HP 5334A counter|
Soapbox: Great transmissions from all stations tonight. Signals were much better than normal and atmospherics were at a minimum. However (there's always a "however"!), plenty of Doppler spread and shift to make one's head hurt. (Where's 160 M when we need it?)
|Method: Ten-Tec Omni VI calibrated against WWV, Vertical antenna.|
Soapbox: W8KSE sig RST599 on 40 meters, On 80 meters RST339 QSB
|Soapbox: Very Professional! Callup and measurement periods on time, on freq! W6OQI was weak here in SC, especially on 80, and wandered more (Doppler?) than other stations. Enjoyed the test very much. Thanks to all who made it happen. Jerry W4UK|
|Method: Icom 7700 USB 500Hz filter centered +1500 Hz. Audio Measured with
WSPR and added to Dial Freq. No External Reference used.|
Soapbox: Signals were all above S9 except W6OQI on 80. It was S4-S7. Overall timing of test was confortable. I lost K5CM 80M data thru Op Error.
|Method: The equipment is: Kenwood TS50 Transceiver, HP3330B Synthesizer, TEK2712 Spectrum Analyzer.
I used CW mode and the 500hz filter with fast AGC selected on the transceiver. Then I adjusted for zero beat with the tone with the Synthesizer. For the stronger signals I verified with the frequency counter on the TEK. I don't expect a good result for W8KSE 40m. The others should be good.|
Soapbox: The conditions in northern Oklahoma were such that I got a good chance at all of the signals, but I did not get the first one very close. The HP may read low at 5 Mhz by 3 hertz.
|Method: Thunderbolt driving HP5110A/2xHP5100A synthesizers, one at 455 kHz, the other tuned to input frequency+455 kHz, substituting LO of Hammarlund SP-600JX-17, displaying 455 and IF out on dual trace scope. "The eye is a great integrator."|
Soapbox: Doppler was a killer. WWV 5.0 was shifting up to 1 Hz right before the test. Recent rain caused a lot of power line noise on the band, and W8KSE was way below the line noise level. Doppler was serious on all but WA6ZTY.
|Method: Icom 7700 USB 500Hz filter centered +1500 Hz. Audio Measured with
WSPR and added to Dial Freq. No External Reference used.|
Soapbox: Signals were all above S9 except W6OQI on 80. It was S4-S7. Overall timing of test was confortable. I lost K5CM 80M data thru Op Error.
|Method: FT2000 with HP3336, delta reference method|
Soapbox: Good signals, tnx for improvements
|Method: HP Z3801B GPS receiver provides 10 MHz reference signal to HP 3586B selective level meter. The HP 3586B can directly read the received frequency to the nearest tenth of a Hertz. Further resolution is obtained by feeding the I. F. signal from the HP 3586B to a computer running Spectrum Lab. This combination can give resolution down to the milli Hertz level. Despite all this accuracy Doppler shifting certainly works against us. The W6OQI FMT setup can be seen at http://k5cm.com/W6OQI%20%20FMT%20NEW.htm
For transmitting the FMT the HP Z3801B GPS receiver 10 MHz output is fed to a HP 3336B signal generator reference input. The HP 3336B is tuned to the desired FMT frequency. The output of the HP 3336B is fed to the VFO input of a more than 50 year old Johnson Viking One, which serves as an intemediate power amplifier. The output of the Viking One passes through a 6 dB pad and then into an Icom IC-4KL power amplifier. The IC-4KL provides a 500 Watt output to the antenna.|
Soapbox: This was a great FMT with good signals and no QRM at my QTH in Southern California. Let's do it again next year!! 73, Marvin, W6OQI
Rubidium 10MHz Standard
Fldigi version 3.12.5
80M full wave loop antenna used on 40 and 80.
Wait for the intro to stop, tune in as close as possible and flip a coin for the last significant digit.|
Soapbox: My first FMT in 40 years. How has the equipment changed over the years! The timing for this was excellent as I was able to copy all the stations on both 40 and 80 with no QRM and very little QSB. Signal strength was between S7 and +15dB over S9. What great fun! Next time I may hire a psychic to get me an extra significant digit!
|Method: Ten-Tec Argonaut V Rcvr; BC-221; Lap top w/Fldigi and SignaLink USB.
Logged average WWV frequency, before and after each mesurement, and applied to average freq.readings of the FMT stations.|
Soapbox: This is my second turn out for this event. Would like to see it happen more often.
|Method: Rain gutter antenna + ICOM antenna tuner + splitter to ICOM 756 Pro III + separate spectrum analyzer. The spectrum analyzer used a GPS 15 MHz reference with settings of 10 KHz span and 1 KHz resolution bandwidth. Frequency was measured using the marker frequency counter with a 500 ms gate period and recorded during periods of highest audio signal from the Pro III.|
Soapbox: The signals from W8KSE were too weak for my measurement technique to work. The most reliable measurement was for the closest station WA6ZTY in northern California. Measurements for W6OQI in southern California were difficult due to fading with good signal peaks lasting only 1 to 2 seconds. This is my first FMT and I really enjoyed the challenge.
|Method: Receiver is modified Scientific Radio SR-224, HP 3326A Synthesizer for LO and IF disiplined by 10 Mhz cesium clock|
Soapbox: This was a first attempt. As to be expected, an interesting learning experience and great fun. As Arnold says, "I'll be back". Thanks and 73. W8BL
|Method: Receiving with my vintage Icom IC-745, using a PTS-160 synthesizer (purchased on ebay) to generate a local carrier within a few hertz of the transmitted signal. A TRAK 8820 "GPS Station Clock" receiver (borrowed from Lowell Observatory - thank you, Ted) supplied the 10 MHz reference for the synthesizer. Sound card spectrum analyzer (SpectraPlus 5.0 demo version) with microphone next to IC-745 speaker for input to show the offset between the local carrier and the received signal. Pre- and post-test calibration on WWV (at 5 MHz) indicates (potential!) overall accuracy of around +/- 0.05 Hz.|
Soapbox: The W8KSE 80-meter signal was exceedingly weak here in Arizona - without the spectrum analyzer software, I doubt that I would have been able to recognize a signal was even there. This was harder than I thought it would be - the limited time requires fast reaction. I am retired, but used to make my living as a radio astronomer using VERY high precision timing and frequency systems: Very Long Baseline Interferometry (VLBI), with hydrogen maser frequency standards that approached parts in 1e14 accuracy and stability.
|Method: Elecraft K3 calibrated vs. 10 MHz WWV. Measurement by injecting sidetone monitor via "spot" and zero-beating.|
Soapbox: All signals easily audible.
|Method: HP105B, HB WWVB and GPS calibration, Icom R75 RX with HB slave, HB DSS generator, Tec 465 scope, Spectrum Lab display. I first zero beat the unknown using slave and Scope during cw callup. I then inject an offset frequency and plot the difference during key down with SpecLab.|
Soapbox: Signal conditions were very good with very little QRN and no QRM. Doppler varied from 0.04 to 0.9 Hz depending on station location and band. This was my first FMT using the SpecLab display. I enjoyed the test and my heart felt thanks to those that made it possible. 73 Tom
|Method: Home brew copy of SDR1000 w/100MHz TCXO, calib'ed to WWV & CHU|
Soapbox: All signals were usable but with some rapid QSB. Strongest here was K5CM on 3.5 MHz: S9+20dB.
|Method: WJ-8718 Receiver locked to Rb standard, DL4YHF's Spectrum Lab software.|
Soapbox: This was the best FMT yet. Well done!
|Method: Ten-Tec Omni VII. Stopwatch. Using CHU & WWV a frequency error correction graph was made. Fractional Hz values were obtained by tuning off zerobeat (using the internal osc in the Omni VII) and counting beats over a one minute period. Values were added/subtracted from frequency display readout to obtain a final value.|
Soapbox: Signals from all four stations were very good; as strong as S9+20db. THANKS!!
|Method: 80 M dipole, Thunderbolt 10 Mhz reference, HP 3586B with Spectrum Lab used as a initial tuning indicator.|
Soapbox: I was able to copy all 7 signals here in Virginia this time. Thanks to all who took the time to provide this great exercise in frequency measurment. 73 Gordon
|Method: Kenwood TS950SDX in AM mode set to approximately the test frequency.
RF signal generator set approximately 500 Hz below xmitted signal to generate a beat tone. Then used variable frequency audio generator to freeze beat tone on oscilloscope.|
Soapbox: Signal from W8KSE was too weak on 40 meters to get a clear beat tone and unreadable on 80 meters.
|Method: Icom 746Pro, Heathkit IM2420 Frequency Counter, HP Pavilion zd8000 notebook running Spectrum Lab software.|
Soapbox: Conditions were really good here in California for a change. I heard all but W8KSE on 40m.
|Method: Used zero beat with synthesizer by ear on W8KSE and K5CM. Used synthesizer as BFO and compared beat tone with precision 1KHz standard on oscilloscope for W6OQI.|
Soapbox: I was able to make measurements of the other FMT stations before and after my 40 meter transmission. Signals were strong from K5CM and W6OQI. W8KSE was strong enough to copy but probably too weak for my primitive technique. When time permits, I should explore the spectrometer approach.
|Method: Receiver: Yeasu FT-901DM with G5RV antenna
Fluke 87 to measure audio frequency
mRS miniVNA for frequency generator
Measure audio frequency from speaker output to 0.1 Hz with Fluke 87 in frequency mode
Set mRS miniVNA to same audio frequency and then read the frequency to one Hz. Used same technique to calibrate the VNA to WWV.|
Soapbox: This is a simple and straight forward method to measure the frequency. It eliminates all variations within the receiver. However, even after warmup all day, my receiver would drift a cycle or two during the three minute test. I was able to make two to three measurements during each test depending on how good the signal was. W8KSE was the weakest with and S 3 to 6 on 7055; S9 on 3575 and bad QSB. The other stations were +10 or better on all frequencies with some QSB. There was little QRM. If this method is valid I hope to be within plus or minus 5 Hz. My first attempt a couple of years ago was a bust - could not hear ARRL. Thanks for all the stations transmitting. Joe
|Method: Homebrew GPS controlled OCXO, HP3586B, HP3335A, Spectrum Lab. I just used the cursor readout on the Recorded files because there was so much doppler shift and spread. The 7067kHz signal was 1.5 Hz wide with most of the energy in the highest .25 Hz. My computer froze up and lost the wave file on reboot from the first transmission (7055kHz) so only used the counter on the HP3586B on that measurement. Much fun. Thanks to all.|
|Method: Icom R-75 receiver in USB mode is fed the antenna signal and a GPS referenced 3336B synthesizer signal to produce two audio tones. These are fed to the sound card of a computer running Spectrum Lab and the difference in the two tones in the difference between the Signal frequency and the signal generator frequency.
Antenna is a 600 ft. Beverage pointed toward North Africa, so no the best for the western signals, but did hear all of them.|
Soapbox: First time I managed to measure all of the transmissions. W8KSE's signal was strong with some doppler particularly on 40. K5CM's signals were good and solid, as is usually the case here. WA7ZTY's signal was not very strong, but measureable wit a significant amount of Doppler. W6OQI was weak (a different receive antenna might help with that) and I observed much doppler. Much fun, as usual, and I look forward to the results so I can speculate out what I did wrong. Now watching WABC on 770 KHz shift back and forth and pondering what sort of data they might be sending.
|Method: Kenwood TS-930
After I heard the tone, I switched the transceiver to the "Tune" position, as I believe there is no offset in this position. I then tuned for a "zero beat". After getting a good zero beat, I switched in my narrow filter and carefully tuned left and right until I just barely heard a tone on the left and right side. From the left and right frequencies displayed, I manually calculated the center frequency and used that as my result. My transceiver only has display resolution to the "tens" of hertz so that's the best I could do.|
Soapbox: This was my first attempt at the Frequency Measurement Test. It was a lot of fun and I hope it will continue in the future.
|Method: Used spectrum analysis on received signal and locally generated reference.|
Soapbox: RX duties were performed by my novice era Drake 2-B receiver (all vacuum bottles). Analysis used all modern signal processing techniques, comparing to a locally generated reference. Signals were strong in Wisconsin, but plenty of Doppler spread still made for some serious head scratching. Many thanks to all four stations for providing geographically diverse and highly accurate signals.