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Message-ID: <5.1.0.14.0.20020128133318.00b23ec0@POP2.sympatico.ca>
Date: Mon, 28 Jan 2002 13:44:18 -0500
To: rsgb_lf_group@blacksheep.org
From: "Larry Kayser" <kayser@sympatico.ca>
Subject: Re: LF: Frequency standards for LF.  The next g	eneration
Cc: "PLX \(E-mail\)" <Peter.Martinez@btinternet.com>
In-reply-to: <7D653C9C42F5D411A27C00508BF8803DCB9983@pdw-mail-r1.dstl.go v.uk>
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Andy:

First, my thanks for not choosing a signal reference that is Eurocentric, 
DCF77, MSF etc.  That is appreciated very much.

Clarification.  What you have done is taken a crystal 4.1.... MHz, that is 
in fact 2^22, and made it into a VXO that is locked to the GPS.  This 4 
+Delta frequency is to be used as a reference for a DDS, say the AD9850.

The end result is a time and frequency coherency traceable to GPS.

I have the 9850 here making BPSK now, so all we would need is to be able to 
most efficiently demodulate the BPSK to have a most efficiently possible 
system that should take us a few more  dB into the noise.  This I am 
interested in very much.

Fabricating PC boards here is an extreme pain, but if your up to it, please 
let me have a look to see what would be involved.  I will not be 
transmitting from here for a while, until I can get up the tower and 
re-string the LF antenna and the new top hat wires.

Larry
VA3LK