Hello Hamish, hello Tom, hello all,
> 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.
This I do not understand fully. A lot of mixers I know of also let you
set the input gain, even for the microphone input. That makes
IMHO sense here for everybody who's using these input lines with
SoundModem. Otherwise one had to fetch some other mixer
capable of setting input levels. But why should you do so when
smmixer is already available? Only because Tom thinks a mixer
shouldn't affect input levels.
In this case, the mileage of many people _will_ be different.
But I want to ask Tom: What kind of program do you think one
should use for setting levels on soundcard's input lines? (I hope
you agree that this is necessary in most cases.)
> > 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 think it is even better to work with squelch open since the
software carrier detect is significantly faster than most squelch
circuits. If this software mechanism works in a similar way as in
the BayCom driver (I think so since Tom wrote both SoundModem
and BayCom driver) there's nothing to say against it.
For BayCom, everybody around here uses the software carrier
detect, so I would recommend it for SoundModem, too (if it is
similar). Hopefully, Tom could tell us more about this.
> 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.
The advantage of everything standardized....
Cheers, 73
Gerd
