July 18 RESULTS
(9:30 PM CDT)
(10:00 PM CDT West coast run)
K5CM TX FREQUENCY :
80 Meters A - 3556100 Hz (Reference)
80 Meters B - 3556105.737 Hz
W6OQI TX FREQUENCY:
80 Meters - 3565002.873 Hz
Sort by best 80 meter "Uncorrected" reading (B - 3556105.737 Hz)
Sort by best 80 meter "Corrected" reading (B - 3556105.737 Hz)
Sort by best West Coast 80 meter reading (3565002.873 Hz )
|VE2IQ||ON||Bill says Thanks again for a very interesting test. Static level here in Ontario tonight was terrible.|
|WB0LXZ||KS||Bill says - during the “two tone test” I could see the two tones and three “ghosts” on the ARGO screen caused by harmonic distortion. They were all evenly spaced. I measured the spread as 22.96 and divided by 4 to get 5.74 Hz as the difference frequency. Fun.|
|W3JW||VA||Signal strength conditions were weaker than "normal" and QRN was less than the 11 JUL test. Doppler effects (as observed on SL waterfall display) were significant but not as severe as recent tests. Most results were obtained with SpecLab.|
|KM1P||MA||Results will be interesting. I need to come up with a new technique ... my measurement resolution is fairly coarse at 0.17Hz (65536 point FFT on data sampled at 11025Hz).|
|K6OQK||CA||Burt says Your signal was weaker than usual at my location. Doppler spread appeared to be about 1 Hz wide but I may be learning how to look deep into the waterfall display and find the right signal if it will hold still long enough. This was a very interesting FMT and the format works well. Many thanks to you and Pam.|
|W0PHD||MN||BAD QRN got A as 3556100.49 (high again) not a trace of WC|
|W1PW||AZ||Phil says - I didn't come up with a way for my xcvr/ears mode to establish a correction factor for the two heterodyned signals.|
|W6OQI||CA||I hope I understand how you want the results of uncorrected vs. corrected reported.|
|K6APW||CA||Jim says - very interesting to listen to the two carrier shifting of the beat! Too tough to count in the QRN though. The sharp dips of W6OQI from S9 to S5 or so - also interesting -- double beats sometimes. Thanks for the continuing education.|
|K6YAZ||CA||Stuart says - not too strong but OK in 20 Hz bandwidth. Doppler fairly low. Marvin quite strong as expected but with some QSB and slight Doppler shift. Well thought out test tonight both for Spectra Lab users and mere mortals such as myself. Thanks for the test.|
|W5UFZ||AZ||80 meters not usable here in July. QRN S-9. Something was on 3555.93835 but not sure it was u. Will wait for 40 meter FMT.....'73 de Dick W5UFZ|
|K8JQ||WV||Seemed to be more Doppler on 80 meters than in recent tests.|
|VE2AZX||QC||Conditions were average on 80m Sig was 55. The standard deviation of my readings was .55Hz.|
This is a screen capture of a wave file generated by Joe, KM1P in Boston. In this example it is not important to know any details form Joe as to what frequency his receiver was on. By definition it is know that Signal A is on 3556100. I looked for and found a spot when both signals A and B looked the same (top trace). I measured the difference between the two points, which even at this relatively low resolution can be measured to be about 5.75Hz. Add the 3556100 to 5.75 to get the frequency of signal B 3556105.75 Hz, off from the true frequency by 13mHz.
Even at this small amount of separation it would seem that the signals are at least fading at a different rate, however more testing is needed to verify this.
It was interesting watching my plate current on the Drake almost drop to zero as the two frequencies beat together.
VE2IQ almost hit the nail on the head with a corrected reading of ".001 Hz low". W3JW and WB0LXZ both turned in ".003 Hz high" readings. It will be interesting to see if they can repeat.
Honor Roll: (.1 Hz or better on two bands or more)
Stations copying K5CM run to .1Hz or better.
VE2IQ, VE2AZX, W3JW,WB0LXZ, KM1P, K6OQK
Stations copying W6OQI "West coast run" to .1Hz or better.
K6OQK, WB0LXZ, K6YAZ, K5CM
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 a Drake L4B at 300 watts output except on 30 meters where the power is 75 watts.
80 - Cage Dipole (favors East, West, and North)
40 - Dipole (favors East, West)
30 - Dipole (favors East, North, West)
20, 17 - 4 element SteppIR in Bi Direction Mode (East/West)
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.
Thanks to all that participated.
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