September 26, 2007 Results
80M run 9:30PM CDT
40M run 9:00PM CDT
30M run 8:30PM CDT
20M run 6:00PM CDT
West coast run - 40 M run 10:00 PM CDT
K5CM TX Frequency:
80 Meters A - 3555932.1 Hz
80 Meters B - 3556133.343 Hz
Difference - 201.243 Hz
40 Meters - 7055146.238 Hz
30 Meters - 10115874.673 Hz
20 Meters - 14055377.837 Hz
W6OQI TX Frequency:
40 Meters - 7065128.855 Hz
Sort by best 80 meter difference reading (201.243 Hz)
Sort by best 80 meter "B" reading (3556133.343 Hz)
Sort by best 40 meter reading (7055146.238 Hz)
Sort by best 30 meter reading ( 10115874.673Hz)
Sort by best 20 meter reading ( 14055377.837Hz)
W6OQI TX Frequency:
40 Meters - 7065128.855Hz
Sort by best West Coast 40 meter reading
*Burt is in ground wave range of Marvin
|NF8M||MI||My first entry. I just stumbled across your 80m signal last night, so looked you up on the web, and used fldigi to get the tone frequencies. It was fun! I look forward to catching these more often in the future. 73 Frank|
|W6OQI||CA||"Earlier experimenting today with my own test signals showed using my Icom 756 PRO III transceiver in AM mode to be the best way to measure the frequency differential using Spectrum Lab."|
|W1PW||AZ||No signal heard from WC on or near 7065. Nothing... Nada...|
|N8OB||OH||Signals were non-readable or very weak.|
|VE2AZX||QC||Very strong Sig on 20m,No sig on 30m,Strong on 40m, Moderate on 80m, Tnx for FMT|
|VE2IQ||ON||Good copy both 20M runs with constant amplitude but freq increasing over East, decreasing over West so I averaged them.|
|W5UFZ||AZ||K5CM sigs 599 W6OQI 549|
|VE3OAT||ON||Beautiful signals on 20 m (little QSB and no Doppler spreading) but my receiver wasn't warmed up yet. Shame on me! No propagation for the 30 m run. The other runs were as challenging and fun as ever. Thanks to Connie and Marvin.|
|K5CM||OK||Signal was weak and willowy for most of the run, but that's what makes it interesting. Thanks for doing the west coast run" and giving me a chance to measure also"|
|W3JW||VA||Signals were all stronger than normal, except for 30 meters which was barely readable. Doppler spread was much less noticeable, compared to recent tests, except for the 80 meter signal where it was pronounced on both the AM mode" and "standard" portions of that test period."|
|WB9FIP||WI||Tough going tonight on most bands, especially 20 and 30 meters. 80 meters S9. Keeping my fingers crossed on Marvin's signal. Thanks to all for the tests.|
|WA1ABI||RI||Great copy on 20,nil on 30,good on 40 and 80,tough copy on WC 40m. Thanks Connie and Marvin.|
|K6OQK||CA||Connie, Sorry I missed the 20-Meter Run. Signals we're good on 80, 40 and 30 Meters with some Doppler. For your signals I use my long Inverted-V. For Marv I use my short-longwire, which has minimum skywave on Marv's signal. Once again, thanks for a great FMT and all your work on our behalf.|
|KC0VSJ||MO||Some of the worst propagation in weeks. Really had to dig in the mud to recover signals from Oklahoma, though W6OQI was pretty strong. Also looks like I need to work on sound card calibration some more|
|K6APW||CA||20 over 15dB difference 20M east/west - WC in noise"|
|N5PWG||TX||20 M very weak with QRM. 30 M: no sig heard. 40 M:Fair signal. 80 M:B" signal looked erratic. WC: Good signal with QRN. Thanks for the fun wish I had a frequency standard.|
|WB0LXZ||KS||Thanks, I sure need the practice! Bill|
It is good to have Burt's ground wave reading of Marvin's signal. It adds another independent level of validation to Marvin's transmitted frequency. It would be great to find a station in ground wave of my signal, but no luck finding anyone in the local area.
Because I have no independent verification I usually do two things:
1 - I log/monitor WWVB for at least 1 hour in the daytime, on the day of the FMT. I use my HP-3586 with the same GPS standard for this test. For this FMT, the results were 60000.000002 (3.88E-11) over a one hour average. This does not mean my GPS is off by this amount, it just shows two independent methods differ by that amount over a 1 hour average. However, assuming the worst case and give all the error to my GPS, this would translate into about a 500 micro Hertz error on 20 meters. The closest 20 meter reading was Brad,WB9FIP at 56,000 micro Hertz high.
2 - During the FMT I monitor the test with a separate receiver/computer not connected to my GPS. I use this system to look for any short term drift.
Although I can monitor absolute short term frequency of the transmitter with a counter capable of reading to 1 mHz in about 10 or 15 seconds, it uses as it's time base the same GPS source as the 3336B which drives the transmitter.
Stations copying K5CM 80 meter difference run to .01Hz or better
N5PWG*, VE2IQ*, WB9FIP*, W6OQI, WA1ABI, K6OQK, VE2AZX, W3JW, W1PW
Stations copying K5CM 80 meter B frequency run to .1Hz or better
VE3OAT, WB9FIP, VE2IQ, WB0LXZ, WA1ABI, W3JW
Stations copying K5CM 40 meter run to .1Hz or better
VE3OAT, WB9FIP, K60QK, KC0VSJ,VE2IQ, W1PW, VE2AZX
Stations copying K5CM 30 meter run to .1Hz or better
Stations copying K5CM 20 meter run to .1Hz or better
Stations copying W6OQI West coast run to .1Hz or better.
Transmitting equipment used by K5CM for this FMT:
A HP-Z3801 GPS clocks a HP-3336B and a PTS-250. A small 10 db transistor amp follows and drives a 12BY7 / pair 6146. Then to the final amplifier, a Drake L4B at 300 watts output except on 30 and 17 meters where the power is 75 watts. There are no mixers or any device in the chain of amplifiers that might impact the accuracy of the HP-Z3801. As a reality check, I periodically log the HP-Z3801 against WWVB.
80 - Cage Dipole (favors East, West, and North)
40 - Dipole (favors East, West)
30 - Dipole
20 - 4 Element SteppIR Yagi
Current W6OQI FMT transmitting equipment:
My transmitting setup consists of a HP Z3801 clocking a HP 3336B which drives a Johnson Viking I transmitter, the output of which is attenuated by a 6 dB attenuator, to then drive an Icom PW-1 amplifier to about 500 Watts. The antenna is an inverted Vee which favors north and south from the Los Angeles area.
Note: Because I put the results up quickly, there will be mistakes, so don't hesitate to point them out quickly.
back to main page