K5CM FMT MAY 21 2015
Readings are listed by quickest time to report and within .5 Hz
K5CM - 3599012.2 Hz
|Call||Section||Grid||Freq 80||Time in PDT||Comments|
|WB0LXZ||KS||EM27pj||3599012.4||20:05:53||HP3586b did all the work. I only used its frequency counter.|
|Not within .5 Hz|
|W5AJ||WTX||DM82||3599013.3||20:05:16||k3 with original KSYN3, 400hz roofing filter and SL software|
|AA0CL||MO||EM48||3599013.25||20:05:41||Naked K3, calibrated to WWV at 5 MHz. 20 dB over S9. Cal at 2.5 MHz was higher in freq but I'm sticking with 5 MHz cal (we'll see).|
|WA4FJC||VA||FM08lf||3599011.56||20:06:13||SLM with a different technique. We shall see. TNX Connie.|
|KØMZ||KS||EM28ix||3599008||20:06:21||I forgot to enter my call, state (KS), and grid for 40. This time maybe I will be faster as it is all part of the fun. Your signal for 80 was more than 40 over S9. Thanks, Connie, lets do this again as it is great for pre production planning.|
K5CM - 7064010.6 Hz
|W5AJ||WTX||DM82||7064010.45||19:35:14||Thanks, nice test Perhaps space different bands 15 minutes apart instead of 30?|
|KM6QX||EB||CM87||7064011||19:35:47||Dipole antenna and Flex-1500 receiver in CW mode. 600Hz tone to scope triggered by Signal Generator. Tune SG to null phase drift, then add SG(-600)to VFO.|
|KØMZ||AL||EM28ix||7064010||19:36:12||40 was better this evening. The noise floor on 40 was about S7 to S8 with QRN. Your signal was very strong at more than 40 over S9. Solid!|
|W3DAD||MDC||FM19||7064010.65||19:37:24||Thanks & 73 Kevin W3DAD|
|Not within .5 Hz|
|AA0CL||MO||EM48||7064011.25||19:36:24||Naked K3, calibrated to WWV at 10 MHz. My 20m entry was 0.5 Hz too low (should be 14121009.5, forgot cal offset). Realized it too late for resubmittal. Had to recalibrate for this test, even though same WWV (osc drift). Nearly 10 dB over S9 this time. Form made me reenter my 20m score (why?).|
K5CM TX - 14121007.9 Hz
|KM6QX||EB||CM87||14121007||19:06:41||Dipole antenna and Flex-1500 receiver in CW mode. 600Hz tone to scope triggered by Signal Generator. Tune SG to null phase drift, then add SG(-600)to VFO.|
|Not within .5 Hz|
|W5AJ||WTX||DM82va||14121007.13||19:05:29||K3 and SL software|
|AA0CL||MO||EM48||14121009||19:05:35||Naked K3, calibrated to WWV at 10 MHz. S4 signal on Butternut vertical.|
|wd6dod||ORG||DM13ao||14.1210073||19:06:01||Anan 100d - fldigi|
|KØMZ||KS||EM28ix||1412106||19:06:33||Thanks, Connie. This type of FMT is fun. Your 20 meter signal this evening was s3 to s7 with kigh noise floor of s5.|
|W3DAD||MDC||FM19||14121007.17||19:07:08||Good signal on 20M. Thanks W3DAD|
|N2GL||OR||cn85kp||0||Shutting Down before FMT start due to heavy lighting storms|
Rules for this FMT:
This FMT will be more about making a quick reading than absolute accuracy.
K5CM will do a 5 minute FMT call up near the published frequency. At the end of the call up the TX frequency will be shifted by up to +/- 15 Hz. Then key down for 30 seconds. Measure the frequency of the key down signal and report your results with the Web entry form.
To make the ranking list, your reading must be within .5 Hz (the entry server will automatically time stamp the entry with-in 1 second).
Transmitting equipment used by K5CM for this FMT:
A HP Z3801 GPS frequency source clocks a HP-3336B. The output is feed to a 10 db transistor amp which drives a 12BY7 / pair 6146. Then to a MLA-2500 running about 400 watts. There are no mixers or any device in the chain of amplifiers that might impact the accuracy of the GPS frequency source. As a reality check, I periodically log the frequency source against WWV and other GPS referenced sources. I monitor each transmission with a completely separate receive system to look for any instability or short term drift.
I typically see considerably less than 1 mHz difference at 10 Mhz when comparing two Z3801's or a Z3801 and a Thunderbolt, over a 10 to 10,000 second period.
160 - Vertical
80 - Cage dipole. (favors West, North, East)
40 - Standard Dipole hanging between two 80 foot towers. (favors East, West)
20 - 4el SteppIR at 70 in bi-direction mode
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