Many thanks to K5CM for his fine work on this. Will be very interesting to see the results. Soapbox: Very weak signals this time made this a special challenge. Method: Flex 6700 w/GPS to FLDigi in Freq. Soapbox: Very poor propagation due to high noise from Solar Storm passage. Recalculated the data and subtracted the offset for LSB (Fldigi calculates for USB)- oops on the first submission! Method: TS-990S Calibrated to WWV and long-term stabilized.įldigi calibrated sound card to WWV and added 22 ppm correction. I have acquired an oven-controlled crystal oscillator and a GPS board a winter project will be a GPS-disciplined oscillator to run a DDS comparison oscillator. I rather hate to admit it-but this is fun. Soapbox: Did not hear 40 meter signal at all. Verified calibration of soundcard against WWV audio frequency signals using AM detector. Transceiver tunes in 10 Hz increments, so followed beat frequency across the sidebands carefully and took best guess. Watched WWV during the hour or so before on 2.5 and 5 MHz. 80 was weak, and heard 2 or 3 dead carriers near 3598mhz 160 QRM QTH. Soapbox: Nothing heard on 40 meters.poor conditions. Method: FLEX 1500 and Motorola R1200AS Service Monitor.zero beat Skip too long for short 80 mi distance from K5CM. Used auto spot feature of K3 to match tones. Soapbox: Harder than I thought it would be. Had to get the dartboard about which trace to use on 160m. Received the 40m signal at -90.4 dBm, 80m at -72.2 dBm, and 160m at -100.4 dBm, with about 10 dB of fading. Soapbox: Decent signals into Northern Virginia. Calibrated the sound card sampling rate using the HP3336C Frequency Synthesizer. Sampled the audio IF from the HP3586B, and analyzed it using Spectrum Lab. Method: Received the signall using the HP3586B Selective Level Meter locked to the 10 MHz reference from a Trimble Thunderbolt GPS receiver. Setup can easily detect a -120 dBm signal at the radio input, but nothing was seen on the Spectrum Lab waterfall when tuning on 160m for the FMT signal. Very disappointing that no signal was seen/heard on 160m. Soapbox: Good signal on 80m (-93dBm at radio input), weaker on 40m (-102dBm). Tuned synthesizer frequency and amplitude to best match appearance of key-down signal on Spectrum Lab waterfall. Thunderbolt GPSDO 10 MHz reference signal was fed into external ref. After key down period, switched radio input to HP 3335A frequency synthesizer output (through 70 dB of attenuation). Method: 98' long W5GI dipole oriented E-W connected to Icom IC-7000 SignaLink interface to laptop running Spectrum Lab. I will write up more for the FMT-nuts group. I did not use the line-voltage regulator. I do not have the original calibration book. I modified the Lampkin for ham bands and created a calibration chart to be used for the FMT. Method: Vintage – Lampkin 105-B Micrometer Frequency Meter (1940) used as a heterodyne source and a Collins 75A-4 receiver (1959) used in AM mode to hear the beat. I missed the 160 meter signal because I was busy trying to find it with the Lampkin. Just before the FMT, I zero-beated the 100 KHz calibrator against 15 MHz WWV. Method: Vintage – Collins 75A-4 receiver (this one built in 1959). This time I sampled WWV2.5 and WWV5 during the "dead time" to get a better sense of the multipath distortion for adjusting the submission numbers. Lack of short skip helped to reduce multipath variations. Soapbox: Very weak signal on 160M but usable. wav file through SpecLab, and at a later time replayed to export data to spreadsheet to refine submission numbers. 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, Vista laptop running SpecLab, DigiPan for spotting, EZGPIB controlling Prologix USB-GPIB to set up and interrogate instruments, GPSCon for monitoring Z3805A the 2019 was set to inject a reference beat signal to produce a ~400Hz beat tone, and the 3325A was tuned for minimum phase slip between it and the beat tone. K5CM 40 (1 to 5 to 10 Hz): AA8K/C, AA8K/L, AE2A, K1KC, K2AVI, K4CGY, KA8LGI, KD0NEO, KG4YDW, KK5J, KK6PTR, VE3XT, W1UP, W2AGC, W4EDX, W7KBW, W8LJB, WB2AWQ, WB2HYO K5CM All (1 to 5 to 10 Hz): AA8K/L, AF7QZ, K1GGI, K1KC, K2AVI, K2LYV, K4CGY, K6HGF, K7HIL, KA5QEP, KD0NEO, KE5O, KI7RM, KK4KAZ, KK6PTR, KM6QX, W1UP, W2AGC, W2EMN, W9GR, WA4FJC, WB2HYO, WB3JFS
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