Hi Hamish,
when you transmit on 9600, you should hear 'noise' on your handheld, very
similar to 'open squelch' noise.
The most likely reason for the squelch not opening on the receiver is that
you are over-deviating on the TX. Start with the TX level well down, then
increase slowly while monitoring the packet bursts (temporarily set a very
long TXD if the bursts are not long enough). As a rough rule of thumb, the
9600 Data level should be set a bit lower than the level of noise on the rig
with the squelch open. If it's the same or higher, you are over-deviating.
Most RXs work better if the Dev is slightly on the low side, if anything, as
the signal is less likely to be distorted by the IF filters.
Regards,
Robert Jenkins.
mailto:[EMAIL PROTECTED]
> -----Original Message-----
> From: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED]]On Behalf Of Hamish Moffatt
> Sent: 29 January 2000 14:44
> To: [EMAIL PROTECTED]
> Subject: 9600 packet query
>
>
> I confess this is not entirely linux related. I've never been on
> 9600 packet before but now that I have a 70cm FM rig I was eager
> to try it out. It's a Kenwood TM-V7A. I have a YAM which I built
> ages ago and haven't really used.
>
> So I connected up the YAM to the V7A (shame on Kenwood for using
> 6-pin mini din plugs, obscure AND hard to work with). It works
> great on 1200 packet, but nothing happens on 9600. Well, to be honest
> it's late at night and there isn't much activity, so I can't really
> tell what callsigns are valid.
>
> But my main question is: I have a 70cm hand held which I tuned up
> on the same frequency as the V7A. Should I expect to hear anything
> on that rig when transmitting packet? When the YAM transmits,
> the V7A transmits OK, but the squelch doesn't always open on the handheld.
> (It does if I key the microphone on the V7A though.)
>
> I figure this is reasonable since it's not really transmitting FM,
> but FSK. Right? So what should I do with the squelch on the V7A
> for receiving?
>
>
> thanks
>
> Hamish VK3SB
> --
> Hamish Moffatt Mobile: +61 412 011 176 [EMAIL PROTECTED]
> Rising Software Australia Pty. Ltd. http://www.risingsoftware.com/
> Phone: +61 3 9894 4788 Fax: +61 3 9894 3362 USA: 1 888 667 7839
>
