[aprssig] Audio Feedback for APRS Packets and Messages on the TH-D72

Lynn W. Deffenbaugh (Mr) ldeffenb at homeside.to
Thu Jul 25 12:08:36 CDT 2013

But to the original poster's question about being "received by an 
I-Gate", and to clarify the actual meaning of the tones of the D72, 
here's a copy my reply in the D72 Yahoo group:

The "two-tone audio feedback" doesn't mean that your packet was received 
by an IGate.  The only way you can tell that is by independently 
monitoring the APRS-IS via the Internet.

What it DOES mean is that your packet was digipeated AND the repeated 
packet was copied and decoded by your D72.  The original packet, or the 
digipeated packet, or some subsequently digipeated packet (depending on 
your path settings) may or may not be copied and decoded by an IGate, 
there's no way to know that from the RF side.

It is VERY common to not decode a digipeat of your transmitted packet so 
you cannot read any success or failure criteria into the presence or 
absence of the "two-tone" sound.

Lynn (D) - KJ4ERJ - Author of APRSISCE for Windows Mobile and Win32
(and KJ4ERJ-14 is my own D72)

On 7/24/2013 3:48 PM, Robert Bruninga wrote:
> The most important thing to realize is that if you can hit TWO 
> digipeaters, then the chance is very high that you will NOT get a "MY 
> PACKET" display since both of those digis will BOTH digipeate your 
> packet at the same time and you will always get a collision.
> But this is very easy to know.  Just --listen- to the APRS channel.  
> If you hear an immediate digipeat of your packet and the noise is 
> strong (even if it is a cgarbled collision) then you know it got out 
> even though you will not decode it.
> Expecting to see MY PACKET will rarely ever work, unless you are only 
> in range of a single digi.
> Hope that helps.
> I never depend on "my packet" to know how the channel is working.  I 
> depend on what I see on the signal strength display and what I hear.
> Bob, WB4APR
> *From:*Bruce Prior [mailto:n7rr at hotmail.com <mailto:n7rr at hotmail.com>]
> *Sent:* Wednesday, July 24, 2013 3:04 PM
> *To:* TH-D72 List
> *Subject:* Audio Feedback for APRS Packets and Messages on the TH-D72
> I was on two Summits On The Air climbs recently and I was trying to 
> get spot information posted via APRS regarding my operational 
> parameters:  frequency and mode.  When I sent regular APRS packets 
> with the current info in Status Text as well as messages sent to SOTA, 
> I very seldom got the two-tone audio feedback that they had been 
> received by an I-Gate, so I kept sending them.  When I got home I 
> found that a large number of my packets and messages had, indeed, been 
> successful in getting into the system, so most of those repeats were 
> not necessary.  Is there some parameter I need to change on my TH-D72 
> so that I get feedback on APRS packets and messages which succeed in 
> entering the APRS web system?
> Thanks and 73,
> Bruce Prior N7RR
> J. Bruce Prior   853 Alder Street  Blaine, WA 98230-8030 360-332-6046  
>                . Grid CN88px    . Amateur Radio Station N7RR    . The 
> CW Operators' Club 846   . Washington State SOTA Manager   . Pacific 
> Northwest Trail Association   . American Alpine Club #1672    . SATERN
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