September 18, 2007 Results
80M run -9:30 CDT
West coast run - 40 M run 10:00 PM CDT
K5CM TX Frequency:
80 Meters A - 3555500.0 Hz
80 Meters B - 3555702.546Hz
Difference - 202.546 Hz
W6OQI TX Frequency:
40 Meters - 70655333.225 Hz
Sort by best 80 meter difference reading (202.546 Hz)
Sort by best 80 meter "B" reading (3555702.546 Hz)
W6OQI TX Frequency:
40 Meters - 70655333.225 Hz
Sort by best West Coast 40 meter reading
*Burt is in ground wave range of Marvin
|K5CM||OK||Good signal, I did see a pattern in the spectrum that helped my reading this week.|
|K6APW||CA||signals a few dB over noise with QSB|
|K6OQK||CA||Connie, Tonight your 80-Meter signal took some fades right down into the noise and at times was gone for 3 or 4 seconds. The deep fades added to the unexpected" that makes each FMT something new. Marv's signal was unusually stable this evening. I suppose that's the tradeoff for the differences in distance tonight. Thanks to you and Marv for another great FMT. A very interesting FMT indeed."|
|K6YAZ||CA||Very weak signals on 80 meters, but was able to get nice 200 Hz tone for SL; 202.54 Hz. Unable to measure individual carriers.|
|N5PWG||TX||Good signals, but I think Doppler correction was variable and, at times, large.I usually get my WWV calibration at about 1:00 PM CDT,but Doppler appeared too great at that time|
|VE2IQ||ON||I couldn't use AM mode last night - just too much nearby QRM, so I did it with 500-Hz narrow CW filter. We are starting to notice some difference between the two tones - for instance: while listening to it sometimes the higher frequency would dominate, sometimes not. It was difficult to count the beat notes - lots of short-term jitter; often difficult to make the call. Also lots of QSB. My submission is just an educated guess this time. I don't think I averaged long enough to take out the short-term uncertainties. The west coast 40 M run looked much more stable than your 80 M B" signal - but I expect the ionosphere will take its toll on both so I'll hold my excuses until you post the results! Thanks for the fun|
|W0PHD||MN||A lot of QRN and WC was weaker than usual; in noise a lot of the time. The frequency and time selection for this time of the year seems to be about right. It is evident that a lot of thought goes into these tests THANKS!|
|W3JW||VA||Conditions were average to above average with moderate QRN . Doppler effects were moderate but quite noticeable (both on the test signals and WWV). The the two frequency AM mode" waterfall display had as much "doppler spread" as the baseline RF signals had."|
|W5UFZ||AZ||tnx fer running tests, low qrn, sigs 5-6-9|
|WA1ABI||RI||Very difficult condx tonight. QRM on 80; QRN and lots of Doppler on both 80 and 40.|
|WB9FIP||WI||Good signals from both Oklahoma and California tonight. Low Doppler on 80 meters, while the Doppler on Marvin's 40 meter signal continues to baffle me. Thanks to Marvin and Connie for the tests.|
Capture of Marvin's 40 meter signal by K5CM. (use the magnify button if you can't read the screen)
Play the ending sequence of Marvin's 40 meter run.
I merged a couple of captures by W3JW, Jeff together. You can easily see the Doppler spreading the 200 Hz run, but the 100 Hz still looks clean.
The jury is still out on whether the 200 Hz difference is starting to show signs of Doppler spread. No one hit the FMT "nail on the head" this week, but several were still very close. QRM and QRN may have had some impact on the readings this week (see VE2IQ's comments above and the merged captures above). We will continue the 200 Hz span for at least another run.
It was interesting to note that more than half of the participants copied Marvin's 40 meter run to better than .1 Hz. Even though Burt usually reads Marvin's frequency to better than .1 Hz, this is the first time, he read Marvin's frequency with zero error. Burt is in ground wave range of Marvin. (see Burt's comments above)
Stations copying K5CM 80 meter difference run to .01Hz or better
N5PWG, K6OQK, WB9FIP, WA1ABI, K6YAZ, VE3OAT
Stations copying K5CM 80 meter B frequency run to .1Hz or better
WB9FIP, W6OQI, K6OQK
Stations copying W6OQI "West coast run" to .1Hz or better.
K6OQI*, K6YAZ, WA1ABI, VE3OAT, K5CM, K6APW, N5PWG, K8JQ, W3JW
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
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