[aprssig] APRS-B? (QRM?)

Robert Bruninga bruninga at usna.edu
Mon Jun 24 10:27:25 CDT 2013

> I have 433.900 in an HT memory.

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.
They drift when you try to listen with a NBFM radio.  When we use them say
at 9600 baud, I woiuld assume we would use the 60 KHz deviation setting
which your HT would probably not evn break squelch on...

> Could there be an issue with all the remote wireless weather sensors
>  and whatever else I hear constantly beeping, bleeping and squaking on the
> Part 15 frequency  433.900

Yes!  But we can play too and with our favored locations and knowledge of
antennas and o ur legal use of higher power (500 mw) we should be able to
have some reasonable success.

Bob, Wb4APR

73, Steve, K9DCI USN (Vet) MOT (Ret) Ham (Yet)
--- On Mon, 6/24/13, Robert Bruninga <bruninga at usna.edu> wrote:
I’m impressed with the 500 mw transceivers on 433 MHz costing $20 or so and
operating at 9600 baud.
Why don’t we call this APRS-B (plan B).  And start paralleling our network
with these devices.

Then instead of only 5% of hams having APRS capability, we could get more
people in the clubs to own a device and also to put one up at home so we
have a backup data channel as well?

Maybe lots of you are doing this alrady and I am the last one to the party.
But whatever we do, lets standardize on something so we are all headed in
the same direction.

These are wideband devices, so they are not compatible with any existing
APRS or other ham FM radios.  That is why it is a fresh start.  What is the
sync and key up time?

Sure the range of 500mw is small, but at only 10% of the cost of a digi we
can put them at more and closer places and even solar power them.


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