K5CM FMT 

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)

                                        AUDIO                      RF

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

Comments

_____________________________________________________________________________

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

*(Zero error)

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

W5UFZ

Stations copying K5CM 20 meter run to .1Hz or better

WB9FIP

Stations copying W6OQI West coast run to .1Hz or better.

K6OQK, KC0VSJ

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.  

Antennas:

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. 

Connie

K5CM

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