Linux-Hams archive - August 1999: Re: soundmodem on SBPro

Re: soundmodem on SBPro

Hamish Moffatt (efpjz@rele.tunk.net)
Wed, 4 Aug 1999 09:57:00 +1000

On Tue, Aug 03, 1999 at 12:57:16PM +0000, Gerd wrote:
> [setting input gain level using smmixer]
> >
> > I've got the problem sorted out now -- nothing that couldn't be fixed
> > with a good text editor and a C compiler! I'm not sure why smmixer
> > won't let you set the input gain, but my copy does now. I have packet working
> > on the sbpro now.
>
> So how about making a diff and submit it to the public (eg. into this
> list) ? :)

Tom told me that he does not think the mixer should affect the input
gain for recording, only for playback (passthrough). This did not seem
to be my experience but he is more knowledgable than I on this topic.

> A problem with your squelch and how it is interacting with the rest
> of the audio part of your receiver. Here you'll have to look for a
> possible modification, or build your own squelch circuit.

Do you think it is a problem to operate with the squelch open always?
The soundmodem seems to do a pretty good carrier detect anyway.

I bought an ICOM IC-02A HT yesterday for packet so perhaps that will
behave a bit better. I like the way ICOM and Yaesu are using the same
interface for PTT on their HTs; I plugged this ICOM straight into my
TNC and it worked fine.

Hamish

-- 
Hamish Moffatt       Mobile: +61 412 011 176     aysxo@mailit.tunk.net
Rising Software Australia Pty. Ltd.    http://www.risingsoftware.com/
Phone: +61 3 9894 4788    Fax: +61 3 9894 3362    USA: 1 888 667 7839