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[aprssig] Re: aprssig APRS Telemetry

Andy AB9FX ab9fx at aprs.pl
Fri Sep 8 18:27:43 UTC 2006

In the KPC3+ there are only two first analog inputs ready to use (AN0 and
AN1). You need just to install proper resistance for voltage divider (R27
for AN0 and R13 for AN1), so the voltage would be in the range of 0-5V in
the K (AN0) and J (AN1) points.
I've installed R27 41k2 (most common); in such case when R24 is already
10k AN0 input before divider is in range of 0-25.5V getting 0-5V in the K
point. This is for easy battery voltage calculation. APRS analog telemetry
range is 0-255. Having voltage of 12.2V you get 122 in telemetry packet.
Moreover for AN0 and AN1 in the KPC3+ you need configure jumpers J8 and
J10 to have AN0 and AN1 on the DB-9 radio port (pins 4, 8) or DB-25 comp
port (pins 18, 11). See
Other analog telemetry inputs AN2, AN3, AN5 are available with some
modifications. I used description from
Temperature measure and current measure circuits I took from Bob
description http://web.usna.navy.mil/~bruninga/ande/ANDEeqns.gif

----- Original Message -----
From: "Doug Ferrell" <kd4moj at kd4moj.org>
To: "Andy AB9FX" <ab9fx at aprs.pl>
Sent: Friday, September 08, 2006 08:27
Subject: Re: [aprssig] Re: aprssig APRS Telemetry

> On Fri, 8 Sep 2006, Andy AB9FX wrote:
>> Some settings for our digi/wx/tlm with solar panel (only power source)
>> http://www.aprs.pl/gontyniec.htm
>> Analog telemetry: 1 - battery voltage, 2 - current from the solar panel, 4
>> - temperature inside of the KPC3+.
>> 73!
>> Andy SP3LYR
> Morning Andy:
>  I'm trying to interface my KPC+ with telemetry to monitor the digi shack
> voltage and temperature.... can you point me to a help file on how to get
> this interfaced. I've seen several docs on the internet but they all seem
> to be missing some info. Thanks!
> --
> ...DOUG

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