[aprssig] More on polling the d7/ d700

[Wes Johnston]

I ran my test yesterday too...  It was the first time I ran a test that didn't
have a basic stamp involved in recent memory.

My hope was that we could work out some sort of digipeater polling scheme where
the digi could poll the d700's as network congestion permitted.  The users
would run a beacon rate of 30 minutes and the digi would make them beacon more
often.

We tried it and the ?APRSS message packet makes the radio ACK the message, then
a few seconds later send a posit.  This non-contiguous ACK/POSIT adds enough
uncertainly that I don't think this will be the solution I was looking for.

Good info though on the BCN being off.... not sure how much power u gunna save
though.... the quiescent current is the killer.... Can't remember how many mA
it draws just sitting idle, but it's considerable, esp when you consider it may
transmit every 30 minutes.   Depends on your needs though....

Would be kinda slick to use a pocket tracker when the kenwood was off though....
that would be power thrifty.

Wes
--



Quoting "Brian B. Riley" <brianbr at mac.com>:

> Herb sent this to me privately and it got me to thinking so I conducted some
> tests with my d7 and d700 and I am posting the reply back to the list
>
> The D700 indeed will respond with a posit on receipt of the message to
> itself with "?APRS?" Embedded in the text. It will do so regardless of the
> status of the BCON . ON or OFF it will beacon in response. The only way it
> won't is if the TNC is not enabled or it doesn't have a good posit.
>
> This means that you could set the d700 to absolute minimum current demand,
> light off, second channel off, digipeat only on an oddball call, read the
> GPS and fix set the lat/long and turn off GPS and then
> poll it occasionally to get a relative position to yourself. I think you
> could easily halve or third the drain on the battery.
>
> --
> Cheers ... 73 de brian, n1bq, underhill center, vermont
>
>
> On 1/12/05 12:09 AM, "Herb Gerhardt" <hgerhardt at wavecable.com> wrote:
>
> > Brian,
> >
> > Tell me more.
> >
> > Are you saying you can leave the D700 turned on at say the trailhead with
> BCON
> > turned off (not displayed), and then when you send the ?APRS? message, the
> > radio will respond with its position.  So the rest of the time it sits idle
> > until I query it.  Is that the way I understand it?
> >
> > I normally leave my D700 in the truck on PM5 which is programmed to only
> > activate the left channel which is on APRS with the display lighting turned
> > off and no beeping or sounds.  It is also set up as a digipeater but will
> only
> > respond to my suffix (UVC), so that it will not digipeat anyone except for
> me
> > from my D7A.  That allows me to utilize the D700 as my private digipeater
> just
> > in case I can not hit the system from my D7A from my location.
> >
> > Obviously your message has my mind going on other possibilities.  Will have
> to
> > play with this idea.  Any inputs from you would be appreciated on how else
> you
> > utilize your radios.
>
>
>
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