[amsat-bb] PSAT2 downlink for DTMF grids and messages

[Robert Bruninga]

See in the middle of the page under DTMF messages the format for QSL:

DTMF special reversed QSL Message Format: . . . Bxx40CCCCCCXXXX#

The "C" format is for general messages.
The "B" format allows you to reverse the order of the modifier and message
number so that you can store the message number 40, or 41, or 42 and
callsign in memory and then all you have to do is manually enter "BNN" and
then play back y our prestored message 40 and call.

http://aprs.org/psat2.html

Bob, WB4APR

-----Original Message-----
From: AMSAT-BB <amsat-bb-bounces at amsat.org> On Behalf Of Scott via
AMSAT-BB
Sent: Monday, August 12, 2019 11:47 PM
To: amsat bb <amsat-bb at amsat.org>
Subject: Re: [amsat-bb] PSAT2 downlink for DTMF grids and messages

Many thanks to Robert for the time he's put into creating these very
informative web pages!

Bob, I have read and re-read the DTMF instructions but even though it
reflects poorly on me, I'm not sure what exact string to transmit to QSL
someone's previous CQ.

So here is my best guess - please correct as required.

My callsign/grid DTMF (that has worked once) is:  *18175453702201#

For me to QSL CQ #45 from KC9ELU, do I transmit the following?:

C4045*18175453702201#


Thanks in advance!

-Scott,  K4KDR

==========================

On Mon, Aug 12, 2019 at 9:55 PM Robert Bruninga via AMSAT-BB <
amsat-bb at amsat.org> wrote:

> Thanks to Robert, KE6BLR, we can now capture the DTMF Grids and
> Messages data coming down from PSAT2.  I have added the DTMF page to
> the list of links for PSAT2:
>
> http://aprs.org/sats.html
>
> Summary:  You encode your Grid and callsign into a 16 digit DTMF
> memory on your radio.  Using narrow band FM, send it on 145.98 withi
> doppler compensation or at the middle of a pass.
>
> PSAT2 assigns a CQ number and acknowledges it by voice and then sends
> an APRS packet that contains the grid.  Robert's web page will capture
> that packet.
>
> A second station can send their DTMF grid and get the same process but
> with a new CQ number.
>
> Now, either station can send a DTMF QSL Message for the other guy's CQ
> number which will also be spoken and recorded on the APRS downlink.
>
> Details on the psat2 page on the above web page.
> PSAT2 is entering a phase of Apogee in the northern hemisphere for a
> week or so and so is more workable in the USA and southern Europe.
>
> Bob, WB4APR
>
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