Good point that Jim ! yes 136.00
Other bits , use wide filter / ssb , gives best results
Frequency stability requirements for Op32 is +/- 1 hz over the 32
min
period , this may be a little wider now , but warm up drift can be a
problem.... as I know after waiting 64 mins .. with no ding
Gary's -41 is about the limit for OP32 , but that's average along the
tx time line as well , so perhaps slightly lower is possible , but a
long time to find out ..
73 -G.
--------------------------------------------------
From: "James Moritz" <[email protected]>
Sent: Thursday, February 02, 2012 9:31 PM
To: <[email protected]>
Subject: Re: LF: New to group
Dear Bob, Graham,
I think you mean it should be 10.136 USB; to get signals centred on
137.5kHz to an audio output of 1.5kHz, the carrier should be at 136.0kHz
Also, when using a converter, it would be worth checking the frequency
accuracy of the 10MHz conversion oscillator - it should be no more than a
few 10s of hertz out if there is not to be serious mis-alignment beteen
the expected and actual received frequencies, considering the slower Op32
"band" is only 100Hz wide. The RX frequency can be offset slightly to
compensate for an error in the converter frequency (or for an error in the
RX frequency, for that matter...).
Cheers, Jim Moritz
73 de M0BMU
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