[OZAPRS] Measuring Frequency offsets

Jack Chomley radio at irock.com.au
Sat Apr 4 11:00:03 EST 2009


At 09:26 AM 4/4/2009, you wrote:
>Hi Jack what is your frequency reference for these measurements?
>
>
>
>I have just finished testing my IC-725 dial set to 10.15102MHz was infect
>receiving on 1015100 LSB Then measured the transmitter and found it was
>transmitting with the dial still at 10.15102 MHz gave a transmit frequency
>of 10.15098 MHz. The TX measurement needs better gear as I had to use a
>second receiver checked as the first then compared the transmitter with the
>received signal. Will borrow a counter from work and do a better measurement
>next week.
>
>
>
>I believe these tests as I was using an HP 8648A locked to my GPS based 10
>MHz reference this set up will resolve well bellow an Hz.
>
>
>
>  Regards Rob ZL3RX
>
>
Rob,

I opened the shack window, listened by ear for WWV on 10 meg, 
zerobeating my calibrated brain with my Icom 7200 receiver it was 
spot on ;-)  naturally assuming that my radio transmits on exactly 
the same frequency, it receives on.....it SHOULD be right!
Yeah well, its not quite like that....I just have a 3 month old radio 
and hope its close to the mark ;-) At least its stable but I am 
showing some stations with a zero offset to me. The SCS TNC produces 
the beacons based on the decoded signal.

73  Jack  VK4JRC

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