[OZAPRS] 12.5 Narrowband radios for APRS

[vk3xci at aanet.com.au]

No no!
2.5kHz is ideal!!!
Generally speaking, for packet radio, less is more! Particularly if the
signal is to be digipeated. More so if the TNC is an old tnc2 and the
wireless an fm828. :)

Whatever you do don't try to up the deviation by overdriving the audio to
rig.

The rule of thumb is NEVER exceed 3kHz! The ideal is to set max dev at
3khz then back off the audio drive for 2.5

Works for me!

Norm VK3XCI



> Hi
> I have a Motorola GM950Plus which was programmed with some 144
frequencies
> and repeaters. I have not had much of a chance to use it. It is a narrow
> band (12.5 kHz) radio but receive always sounded reasonable and
> "un-clipped"
> when used on the 25 kHz channels.
>
> My question; do you think this radio with 2.5 kHz transmit deviation
would
> still be usable on APRS (metro and rural use)?
>
> I've asked the tech who is currently programming 145.175 if he could
> increase the TX deviation and if there are any TX channel filters that
> would
> make this increase useless or detrimental to performance.
>
> Maybe I will just have to increase the AFSK driving audio and hope for
the
> best.
>
> Has anyone had any experience in this regard?
>
> Thank you,
> Nick
> VK2NDA / KI4SIL
> _______________________________________________
> Ozaprs mailing list
> Ozaprs at aprs.net.au
> http://aprs.net.au/mailman/listinfo/ozaprs
>


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