Linux-Hams archive - August 1998: RE: scc driver and DCD on HF

RE: scc driver and DCD on HF

Dave J Brown (gzcmyodf@roskapostia.tunk.net)
Sat, 8 Aug 1998 23:43:34 +0100

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On Saturday, August 08, 1998 1:27 PM, Tony Schonfeld
[SMTP:ctv@reonbroadband.com] wrote:
> hello everybody ,
>
> i wan't to know if it's necessary to use an external DCD decoder
> for HF trafic with USCC card and AM7911 modem ?
> the DCD software seem to be only detect noise from RX and not
> frame or tone activity.
> the DCD software seem to be not adapt for hf trafic !
> all comments are welcome.
>
> 73'Tony

To do a decent job of detecting when it is a good time to transmit on HF can be
very difficult, for example your 'DCD decoder' might need to recognise various
signals including FSK, our 'regular' packet tones, PSK etc etc. A full solution
would be complicated, so maybe looking for 'noise' or the squelch being open is
not such a bad thing after all?

73 G7PIT

--
David J Brown, anywhere

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