Linux-Hams archive - October 1998: Re: soundmodem rx (DCD?) problem

Re: soundmodem rx (DCD?) problem

Thomas Sailer (fatudxu.exwnacecqj@look.ca)
Thu, 01 Oct 1998 12:42:56 +0200


Marco Meijer wrote:

> The mode I used is fsk9600. Thanks for the hint. I will take a look at the
> caps and resistance. If you have a suggestion on how to fix that, I would
> be gratefull.

Most likely you will need to tap the RX signal directly from
the demod chip in the transceiver (warning: high impedance) and you'll
likely have to modify the modulator to get the lower cutoff frequency
down.

> >/proc/interrupts says which interrupts are _used_, not which ones
> >are _occupied_. But nevertheless the detection mechanism is rather
> >unstable and the message is an information only.
>
> Maybe a stupid question, but what is the difference between used and
> occupied in this context?

with used I meant interrupts used by one of the drivers,
whereas occupied meant there is hardware driving the interrupt line,
but the software doesn't care.

Tom