[OZAPRS] 9600 baud

[Norm, VK3XCI]

Grant,

Receive audio after the discriminator and before the de-emphasis network
Conversely, Transmit audio directly after the pre-emphasis network

BUT NOTE... works best with real FM and not phase modulation. For phase mod 
rigs, sometimes  a "real FM" mod is required. YMMV. Most commercial and many ham 
PLL type rigs fall into this category, hence the preference for 1200bd FM





73 de Norm, VK3XCI
Mildura, Australia
The Wintersun City
QF15bt.

On 12/01/2011 11:15, Grant Diffey wrote:
> Richard,
>
> Is that just a unfiltered tap of the discriminator?
>
> or something more exotic?
>
> Grant.
>
>
> On Wed, Jan 12, 2011 at 8:36 AM, Richard Murnane
> <Richard.Murnane at internode.on.net <mailto:Richard.Murnane at internode.on.net>> wrote:
>
>     Hi Howard,
>
>
>         Just wondering why we use 1200 baud for APRS and not 9600?
>
>
>     A mix of technical and historical reasons.
>
>     At 1200, you can just plug packet gear into mic/speaker sockets of an
>     existing radio, without modifying the radio innards. If you want to use
>     9600, you have bypass some of the audio circuitry and get inside the radio.
>
>     Newer radios can work with 9600, but there is an awful lot of older gear out
>     there that still uses 1200, so it's probably not going anywhere soon.
>
>     73 Richard VK2SKY
>
>     _______________________________________________
>     OZAPRS mailing list
>     OZAPRS at aprs.net.au <mailto:OZAPRS at aprs.net.au>
>     http://lists.aprs.net.au/mailman/listinfo/ozaprs
>
>
>
>
> _______________________________________________
> OZAPRS mailing list
> OZAPRS at aprs.net.au
> http://lists.aprs.net.au/mailman/listinfo/ozaprs