On Mon, 13 Sep 1999, Thomas Sailer wrote:
> Michele A Debandi wrote:
>
> > 4800 bps manchester, used with s55mv's modems has a good use here.
>
> We were talking about "manchester 1200baud" which is something
> different.
>
> > Especially because it works with Italtel's surplus uhf radios, where
> > 9600 g3ruh will not work. Or for that matter with IC-02/IC-04 HTs.
>
> Has anyone investigated why RUH doesn't work on those radios?
>
Simply because the PLL adopted clears out the low frequency modulation,
and IF filters are too narrow.
And for The IC-02 there is also a long TX->RX transition time.
For surplus radio the fact is tha the cost of the radio plus the
modifications required to the PLL circuit, IF filters are near
to the cost to build a wideband FM rtx for 38k4, and use the case,
heat sink and eventually the PA unit of the surplus radio :-).
> And if HAPN works on your HT, then you were lucky, it won't
> work with most HTs.
HAPN == S55MV ? I'm not so sure... HAPNS is an 8-PSK (V.27-like)
modulation. That is different from S55MV, that is a 2-psk modulation.
