[hfsig] Performance of 24/192 soundcards? USB Soundcards
wa7gxd at fidalgo.net
Tue Sep 21 19:20:59 CDT 2004
> After a short search I could not find the G3RUH circuit
> although I'm sure I've seen it before somewhere.
You want the figures for, and the article, "9600 Baud Packet Radio Modem
> As I said, it's a modem implementation issue :-)
> > James is a very careful engineer, and he did some pretty extensive
> > work with all this when he designed the modem and specified the
> > required passband response. The BER goes up pretty quickly
> > as the LF response of the system degrades.
> If he noted that the LF demands are increased compared to
> plain old HDLC, why didn't he care to fix it?
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
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