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[aprssig] PPM APRS

Jeff King king.robert.j at gmail.com
Wed Jul 1 21:45:22 UTC 2009


Andrew:

Do you have any good web links that explain Mode S/ADS-B, the tech specs,
formats etc?

What kind of reciever are you using.

Thanks

Jeff  N4864S

On Wed, Jul 1, 2009 at 5:12 PM, Andrew Rich <vk4tec at tech-software.net>wrote:

>  There are heaps of cheap video tx modules around.
>
> Is there any reason why they can't be PulsePositionModulated ?
>
> Should be enough bandwidth
>
> I have been looking closely at MODE S aircraft signals - 1 MB at 8MHz
> bandwidth
>
> Sounds like a click. Sends position
>
> Also been looking at AIS - 9600 self organising GMSK.
>
> Maybe good ole 1200 baud will be a round for a while.
>
> I have been using radio modules - 19k2 on air - 100 mW beef up to 30 watts.
>
> Andrew
>
>
>
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