[OZAPRS] 12.5 Narrowband radios for APRS

[Richard Hoskin]

Hi Nicholas,

Yep you can use a narrow band radio for APRS. However you need to be
careful
when tuning it. Set the deviation to 2.2Khz or below. 

If you want it for rx then the stations/digies that you are rxing must
also
be carefully tuned for a deviation of about 2.2Khz. This could be a bit of
a
problem as most APRS digis have a deviation of between 3.0Khz and 3.5Khz

Cheers
Richard
VK3JFK

> -----Original Message-----
> From: ozaprs-bounces at aprs.net.au [mailto:ozaprs-bounces at aprs.net.au] On
> Behalf Of Nicholas d'Apice
> Sent: Monday, 2 April 2007 4:04 PM
> To: ozaprs at aprs.net.au
> Subject: [OZAPRS] 12.5 Narrowband radios for APRS
> 
> 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
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> Ozaprs at aprs.net.au
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