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[hfsig] Performance of 24/192 soundcards? USB Soundcards

Mark Jordan mark at cpovo.net
Wed Sep 22 13:18:44 UTC 2004


	Hi Anthony,

	I have sent you a 200kb ZIP file with the G3RUH circuit and partlist.
	It would be very interesting having a 9k6bps modem that works without
needing DC frequency response.

	Mark Jordan PY3SS


On 22 Sep 2004 at 13:39, Anthony.N.Martin at marconiselen wrote:

> 
> 
> > http://www.amsat.org/amsat-new/archive/index.php?t
> =./articles/James_Miller
> 
> Thanks.
> 
> The G3RUH circuits are here yes. But the type numbers of all the
> chips are not on the circuit, and even the pin names (eg. clk) have
> been omitted, leaving me clueless if U1 is a counter or a shift register!
> 
> > He was making a modem compatible with the K9NG modem, so the
> > scrambler algorithm and its place in the grand scheme of things
> > were already constrained.
> 
> Indeed. Amateurs (and Pro's) often build on what someone else has done
> irrespective on whether it was right or good or just plain obsolete.
> It's called "Engineering".
> 
> My suggestion is that the receiver could be improved without change
> to the Tx, so interoperability is unchanged or improved.
> 
> Ant M1FDE
> 
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