July 23 and 24 2011 Sudden FMT's

K5CM Saturday: 7075157.225

K5CM Sunday: 7075123.546

W6OQI Saturday: 7075113.486

W6OQI Sunday:  7075064.312


Saturday evening Run

Call Section Grid TX Freq K5CM Error in Hz Error in PPX TX Freq W6OQI Error in Hz Error in PPX Comments
AB4RS VA FM18hw 7075157.225 7075156.856 -0.369 5.22E-08 | 7075113.486 7075113.471 -0.015 2.12E-09 Don't know if the form works or not. Good exercise with the short notice. S9+ signal on K5CM, somewhat weaker, but still good signal from W6OQI, with some serious Doppler spreading of the signal. We'll see how accurate my dartboard is. Still using delta reference method using HP-3336c locked to a Trimble Thunderbolt, using SpectrumLab for analysis. Fun as always.
AF9A IN EM69wv 7075157.225 7075157.237 0.012 1.70E-09 | 7075113.486 7075113.413 -0.073 1.03E-08 Thanks!
K1GGI EMA FN41 7075157.225 7075156.55 -0.675 9.54E-08 | 7075113.486 7075113.1 -0.386 5.46E-08 W6OQI was all over the map, K5CM somewhat more stable. Mostly guesswork, as usual.
K5CM OK EM25 7075157.225 0 | 7075113.486 7075113.307 -0.179 2.53E-08 Good signal into Oklahoma tonight Marvin
K6BZZ SDG DM13id 7075157.225 7075177.22 19.995 2.83E-06 | 7075113.486 7075113.16 -0.326 4.61E-08 Thanks for running the test.
KM6QX EB CM87wv 7075157.225 7075157.34 0.115 1.63E-08 | 7075113.486 7075113.25 -0.236 3.34E-08 This time I used SpecLab instead of Fldigi on K5CM's doppler smear. CHU Doppler was -1.0 to +0.1 here in CA. W6OQI had very little Doppler here, so I used Fldigi's tracking filter. My SpecLab guess would have been 15 mHz higher.  John Stuart, KM6QX
KX0O MO EM38fm 7075157.225 7075156.861 -0.364 5.14E-08 | 7075113.486 7075112.989 -0.497 7.02E-08 Very first try at this!
N2GL OR CN85ko 7075157.225 7075156.987 -0.238 3.36E-08 | 7075113.486 7075113.261 -0.225 3.18E-08 Rapid QSB and Doppler on K5CM here in Oregon. W6OQI stronger with less fading and QSB, but I had trouble reading my handwriting!
n5lbz MS EM53QV 7075157.225 7075157.249 0.024 3.39E-09 | 7075113.486 7075112.999 -0.487 6.88E-08 short notice so trying k1jt's fmt software
VE2IQ ON FN15nt 7075157.225 7075156.838 -0.387 5.47E-08 | 7075113.486 7075113.129 -0.357 5.05E-08 Apparent "wind" blowing from left this time (unusual) with fringes to the right, so true freq probably lower than it looked.  Connie 599 with deep fades, Marv 579 sounding steadier.  Saw some nice straight lines during keydown so I went with them.  Tnx for test.
W0HBK IA EN-42 7075157.225 7075158 0.775 1.10E-07 | 7075113.486 7075114 0.514 7.26E-08 K5CM 599, W6OQI 589 in Cedar Rapids, IA.  Some QRN, but no problem making measurements.  Thanks, Neale
W0PHD MN EN18oe 7075157.225 7075157.31 0.085 1.20E-08 | 7075113.486 7075113.63 0.144 2.04E-08 Sigs fairly strong but so was the QRN. Thanks guys
w4qo GA EM74tb 7075157.225 7075163 5.775 8.16E-07 | 7075113.486 7075118 4.514 6.38E-07 fldigi and K3
W4UK SC EM93 7075157.225 7075157.257 0.032 4.52E-09 | 7075113.486 7075113.088 -0.398 5.63E-08 Signals drifted back and forth 500 - 600 mHz during key-down times here. Could I get you guys to move to SC for future FMTs? Thanks for the test. Jerry W4UK
W6OQI LAX DM04vf 7075157.225 7075156.965 -0.260 3.67E-08 | 7075113.486 K5CM signal was strong with medium Doppler shift here in Southern California for tonights FMT.
WA1ABI RI FN41jp 7075157.225 7075157.01 -0.215 3.04E-08 | 7075113.486 7075113.405 -0.081 1.14E-08 Good sigs with QSB and lots of spread. Creative guesses tonight.
WB0UZW IA EN12TM 7075157.225 7075158.766 1.541 2.18E-07 | 7075113.486 7075112.987 -0.499 7.05E-08 Flex5K and Spectrum Labs. The second time I've tried this. Nothing fancy here.

Audio snippet from Saturday run, buy WA1ABI

audio/40m-cm-july23-by-abi.wav

audio/40m-oqi-july23-by-abi.wav

Audio snippet from Saturday run, buy K5CM

audio/w6oqi saturday july.wav


 

Sunday evening Run

Call Section Grid TX Freq K5CM Error in Hz Error in PPX TX Freq W6OQI Error in Hz Error in PPX Comments
AB4RS VA FM18hw 7075123.546 7075123.67 0.124 1.75E-08 | 7075064.312 7075064.228 -0.084 1.19E-08 K5CM was in at S9+, W6OQI weaker but still quite readable, although with a pretty good smear. Thanks for these quick tests, they are a lot of fun, and help refine the technique.
K5BTK MS EM42wl 7075123.546 7075123.315 -0.231 3.26E-08 | 7075064.312 7075063.715 -0.597 8.44E-08 The signal strength from K5CM was quite good. W6OQI was very weak (no S-meter deflection). The standard deviation on the W6OQI measurement was 2X that of K5CM's. My measurement technique entails significant uncertainty in the 0.1 hz digit, so the last two digits are just dart tossing!
K5CM OK EM25ir 7075123.546 7075123.546 0.000 0.00E+00 | 7075064.312 7075064.385 0.073 1.03E-08 Good signal again tonight Marvin. A little QRM from some SSB station, but did not cause a problem in reading your frequency.
K6APW EB CM87uv 7075123.546 7075123.63 0.084 1.19E-08 | 7075064.312 7075064.63 0.318 4.49E-08 Thanks for the opportunity... K5CM S7-S8, some unstable, QRN about S4. W6OQI S9 with very sharp dips.
K6BZZ SDG DM13id 7075123.546 7075123.429 -0.117 1.65E-08 | 7075064.312 7075063.859 -0.453 6.40E-08 Thanks again for the test. Trying out secondary stuff here at the beach house. '73 from Carlsbad CA
K6HGF LAX DM04 7075123.546 7075123.55 0.004 5.65E-10 | 7075064.312 7075060.34 -3.972 5.61E-07 Sorry I missed Saturday night.
KD5MMM STX EL19ds 7075123.546 7075122.5 -1.046 1.48E-07 | 7075064.312 7075062.5 -1.812 2.56E-07 Yaesu FT847, SpecLab, CHU for reference. Glad you had one on Sunday also, couldn't make it Saturday.  73
KM6QX EB CM87wv 7075123.546 7075123.496 -0.050 7.07E-09 | 7075064.312 It was very tempted to report xxxx123.456 Hz, but that isn't what I measured.  Doppler peaks were scattered over 700 mHz. Used SpecLab to pick the strongest peak near high end but it lasted only about 10 seconds. Connie, thank you for the fun! John Stuart, KM6QX
KMZ KS EM28ix 7075123.546 7075123.8 0.254 3.59E-08 | 7075064.312 7075062 -2.312 3.27E-07 Thanks again, Connie and Marvin, for the FMT.  Tonight we had a thunderstorm so I grounded all antennas and used a JPS ANC-4 as an indoor antenna.  Connie's signal was pretty stable with some QSB and little doppler.  Marvin's signal was bairly audible with more doppler and QSB with a lot of lightning QRN.  These variables make it fun to make it work.  All tuning by ear with Atlas 210X receiver tuned to local transfer oscillator and freq counter.
KX0O MO EM38fm 7075123.546 7075123.445 -0.101 1.43E-08 | 7075064.312 7075063.927 -0.385 5.44E-08 2nd run was all over the place for me
N2GL OR CN85ko 7075123.546 7075123.236 -0.310 4.38E-08 | 7075064.312 7075063.959 -0.353 4.99E-08 Good conditions tonight. Tnx Connie and Marvin!
N5DM STX EL29fs 7075123.546 7075124.5 0.954 1.35E-07 | 7075064.312 7075064.55 0.238 3.36E-08 K5CM sigs S9+30dB above QRN. W6OQI sigs S7 in S9+10db QRN. Thanks guys.
VE2IQ ON FN15nt 7075123.546 7075123.463 -0.083 1.17E-08 | 7075064.312 7075063.648 -0.664 9.39E-08 Almost missed FMT - expected it at 11pm EDT! Still no good model for doppler, even straight lines can mislead.  Now averaging only spot freqs *on* straight line without side smear. Dartboard better?  Like stock market :-) Tnx.
W0HBK IA EN-42 7075123.546 7075123.5 -0.046 6.50E-09 | 7075064.312 7075065 0.688 9.72E-08 Direct measurement using FT-920 with TCXO. Thanks again!
W0PHD MN EN18oe 7075123.546 7075123.85 0.304 4.30E-08 | 7075064.312 7075063.914 -0.398 5.63E-08 storm cell 8 miles to NE so QRN was BAD.... we lucked out again and tornado was 18 miles from us
W1HKJ AL EM64qv 7075123.546 7075130 6.454 9.12E-07 | 7075064.312 Testing Kachina 505DSP transceiver. 
W4UK SC EM93 7075123.546 7075123.326 -0.220 3.11E-08 | 7075064.312 7075063.797 -0.515 7.28E-08 For the July 24 1030PM EDT test. Jerry
W6OQI LAX DM04vf 7075123.546 7075123.268 -0.278 3.93E-08 | 7075064.312 7075064.312 0.000 0.00E+00 K5CM S9 in Southern California with .2 Hz Doppler shift thus it is time for the dart board again.
WA1ABI RI FN41jp 7075123.546 7075123.296 -0.250 3.53E-08 | 7075064.312 7075063.972 -0.340 4.81E-08 Signals not as strong as last night, but still quite good. Lots of Doppler. Thanks Connie and Marvin two FMT's in a weekend.
WA4FJC VA FM07 7075123.546 7075123.4 -0.146 2.06E-08 | 7075064.312 7074998.8 -65.512 9.26E-06 TNX for FMT
WB0LXZ KS EM27pj 7075123.546 7075123.73 0.184 2.60E-08 | 7075064.312 7075063.84 -0.472 6.67E-08 HP3586B, 80M dipole and Spectrum Lab. My GPS antenna is in the attic, and the roof was wetted down by evening thunderstorms. It doesn't work so well that way. Strong signals, seemed to be 1.5 Hz wide. Thanks, I haven't practiced this for a while. -bill WB0LXZ
WB0UZW IA EN12TM 7075123.546 7075123.701 0.155 2.19E-08 | 7075064.312 7075064.288 -0.024 3.39E-09 Using a Flex5000 and Spectrum Lab
WZ4CW GA EM73xn 7075123.546 7075130 6.454 9.12E-07 | 7075064.312 7075069 4.688 6.63E-07 Without better equipment, this is about the best I can do.  AG4LS@comcast.net    73  Carl

 

The first audio snippet from John, WA1ABI demonstrates the very effective 300Hz filter in his FMT receiver. The first recording was made zero beat on 7075 KHz at 6KHz BW. Listen to it first, then listen to the two snippets of the FMT run with the filter set to 300 Hz.

audio/7075.wav

audio/40m-cm-jul24-by-abi.wav

audio/40m-oqi-july24-by-abi.wav

 

Thanks to all who participated in this "Sudden FMT".

73

Connie, K5CM