[nos-bbs] Ubuntu 7.10 some more info about the issues I have

[Steven Stimpson (N1OHX)]

----- Original Message ----- 
From: "Chris" <kc2rgw at gmail.com>
To: "TAPR xNOS Mailing List" <nos-bbs at lists.tapr.org>
Sent: Friday, March 28, 2008 10:58 AM
Subject: [nos-bbs] Ubuntu 7.10 some more info about the issues I have


You have run several different ax.25 engines and several interfaces, since
everything from the Mic input out ward has been tried twice, the only
possible solution is a problem with the rig. Regardless, I cannot
think of any problem with an ax.25 stack that would cause a packet
to be cut short, it is clearly a radio issue. start with ALC
troubleshooting..

Steven - N1OHX




> This isn't NOS specific, but I think the discussions have been on this
> list about this.
>
> The issue is basically that the packet data seems to shift around as
> far as TX Delay and TX Tail.  It isn't consistent in the 'window' so
> to speak.
>
> OS here is Ubuntu 7.10 x86
>
> I've run the Ubuntu packaged ax25 stuff, compiled my own, Ubuntu JNOS2
> and one I compiled on my own as well.
>
> This issue occurs with xNOS or with linux ax25.
>
> This has occurred running either a TNC in KISS mode or a soundmodem 
> (userspace)
>
> I've run TX delay out to 500 at times and as short as 60 and TX tail
> out to 100 and as short as 0
>
> What happens is, sometimes I can hear the keying tone for a long
> while, then the packet goes and then hear the long tail.  This is what
> I would expect with the long settings.
>
> Other times, I get a TX delay that feels more like 50ms, the packet
> just squeaks through and cuts right off, works very fast.  This is how
> my same interfaces behave in Windows with AGWPE or via the TNC
> directly (command mode) in windows.
>
> Other times, nothing at all is TXed, just an empty carrier keyup
>
> Other times, the packet starts too late and ends too late.
>
> It shifts around...obviously causing a  mess of retries or very slow 
> traffic.
>
> This all shifts around in the same session of operation.
>
> It may be an Ubuntu 7.10 issue with ax25 handling, it may be a kernel
> setting I haven't stumbled upon yet it could be that I'm the ultimate
> packet LID...but it's been driving me crazy.
>
> I have a TNC I run in KISS mode and two different soundcard
> interfaces, one traditional with a serial interface for keying and one
> (Tigertronics) that does its own keying.  The two soundcard interfaces
> behave themselves perfectly running psk and other HF digi modes in
> both linux and Windows.  In Windows all of them behave properly with
> 'normal' recommended settings.
>
> I only have the issue on my Ubuntu box and unfortunately, I don't have
> a different version of linux to compare with right now....though I
> think I may fix that soon just to work on this some more.
>
> What else have I done... in soundmodem I've used the tuning
> diagnostics and checked the signal levels and they also look good and
> clean, not overdriven on the RX and I monitor my TX packets with the
> very local BBS I test on and they sound nice and clean and at a
> comparable level to the other local traffic.
>
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