Hi Wolf , Dave is one of my locals (I had coffee with him and some others
this morning) The pcb was designed for those using the SDR-IQ as a microwave
IF so the requirement were probably different to those at LF. At least two
of the locals use the board with the SDR-IQ. They are all ex BT Reseach and
have "significant" test gear.
If you do want to go that way, talk to Dave who usually has stocks of
crystals.
g4hup(at)outlook.com
BestWishes
Alan
G3NYK
----- Original Message -----
From: "Wolfgang Büscher" <[email protected]>
To: <[email protected]>
Sent: Sunday, December 06, 2015 10:33 AM
Subject: LF: EbNaut / Coherent PSK reception with SDR (-IQ) or similar
radios
Greetings all,
After trying a couple of modifications to my SDR-IQ, I found the following
site ..
http://g4hup.com/SDRlock.html
.. which describes how to lock the 66.6667 MHz 'ADC clock' in the SDR-IQ
to an external 10 MHz reference.
Does anyone here have own experiences with this, or a similar circuit ?
Dividing the 10 MHz reference by three, and subtracting that from 10 MHz
multiplied by 7 sounds intriguing, but a multi-pole crystal ladder filter
to 'clean up' the resulting 66.6666666 MHz signal is easier said than done
(..lacking such crystals in the junk box).
73,
Wolf DL4YHF .
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