Hi Steve
I suggest you take a look at the following URL- it is VERY inexpensive and I
believe will do everything that you could possibly want.
http://www.qsl.net/zl1bpu/
Go down a couple of layers on Murray's web page through 'micrprocessor
projects' then the 'synthesised 1 watt LF exciter' to get to the relevant
info.
73
Dave
ZL3FJ
----- Original Message -----
From: "Steve McDonald" <[email protected]>
To: <[email protected]>
Sent: Wednesday, August 14, 2002 6:56 AM
Subject: LF: Oscillator Stabilty for QRSS?
Perhaps someone who has already 'been there' can offer their advice.
I would like to start building the exciter stages for what will be my 136KHz
tx (hopefully we will have access to the band within the year!). The DJ1ZB
exciter (modified by DF3LP) is the circuit that I am questioning. It mixes
two xtal controlled 4MHz oscillators, 136 KHz apart, to extract the 136KHz
signal. Can I build two VFO's, somehwere around 1MHz and set them 136KHz
apart, that will be stable enough to handle QRSS work? I am worried about
drift but also thinking that they may be stable enough if kept in the 1 -
2MHz region. As well, they should (if identical) drift by the same amount
and thus be self-correcting? Is this a reasonable avenue to pursue or should
I just break down and buy a couple of xtals??
Steve / VE7SL Mayne Island, BC
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