[aprssig] APRS-B? (QRM?)

Robert Bruninga bruninga at usna.edu
Mon Jun 24 14:09:07 CDT 2013


> Bob, which modules were those?

Sorry for the confusion. They were cheap ten year old Keychain
transmitters. And I was commenting on how someone was listening on 433.92
on thir narrowband radio and heard lots of QRM.

Sorry for the confusion with your modules..

Bob, WB4APR

> 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.

Scott
N1VG

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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