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[aprssig] Low power APRS digi that allows additional data

DALE wa7ixk at embarqmail.com
Sun Dec 12 02:52:57 UTC 2010

You have to make sure the receiver will handle the RF pollution on the mt. top.
It may become essentially deaf. You need a good tite front end for that.
All the repeater controllers on our repeaters already have data down links on the output frequency accessible on demand from the input frequency.
Apparently you are not familiar with what is already available.
If the repeater is in the upper 2 M part of the band, you can run the Digi thru the same antenna with the proper filters and cavities.

----- Original Message -----
From: "Keith VE7GDH" <ve7gdh at rac.ca>
To: "TAPR APRS Mailing List" <aprssig at tapr.org>
Sent: Saturday, December 11, 2010 6:38:13 PM
Subject: Re: [aprssig] Low power APRS digi that allows additional data

Dale, K7FW wrote...

> I help maintain a solar powered repeater in the Oregon coast range...
> I would like to put an APRS digipeater at the site...

You would have to find another use for the crystal controlled radio that
you have, but take a look at the T2-301 from Argent Data Systems. It is
functionally an OT2m built into a 5W transceiver, but it can be cranked 
up to about 9W. If memory serves me, the draw is about 50 mA.


> In addition to supporting APRS I would like to be able to send data out.
> Plan would be to use something like the Atmel AVR microprocessor to
> monitor some site data (light intensity, xmit on time, temp) and send that
> out periodically. Later I'll add some more weather data as time allows.

The T2-301 (like an OT2m) has two serial ports, plus a "one wire" input.
It can beacon temperature and voltage without any additional hardware. I'm
sure you wouldn't have any trouble connecting the Atmel AVR micro for
additional monitoring.


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