[aprssig] APRS-B? (QRM?)

Scott Miller scott at opentrac.org
Mon Jun 24 13:49:19 CDT 2013

Bob, which modules were those?

The RFM12B has a crystal reference and I can't imagine it being that 
unstable, though I don't see specs in the data sheet.

Unfortunately my temperature chamber and service monitor are at opposite 
ends of the warehouse and it'd take me a bit to get a proper test set up.


On 6/24/2013 8:38 AM, Jason KG4WSV wrote:
> On Mon, Jun 24, 2013 at 10:27 AM, Robert Bruninga <bruninga at usna.edu> wrote:
>> Yes, but the ones we used on our balloons operated from that freq all the
>> way down to 433.65 depending on room temperature or who knows what all.
> How could you possibly build a reliable infrastructure on something like that?
> Mount one of these on a pole, and you'd have a digi that quit working
> when the sun hit the box and heated it up.
> -Jason
> kg4wsv
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