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[aprssig] D710 Scanning stops on TX

Alex Carver kf4lvz at yahoo.com
Wed Oct 17 17:15:22 UTC 2007


> Date: Tue, 16 Oct 2007 15:04:03 -0700
> From: "Stephen H. Smith" <wa8lmf2 at aol.com>
> Subject: Re: [aprssig] D710 Scanning stops on TX
> To: bruninga at usna.edu, TAPR APRS Mailing List
> <aprssig at lists.tapr.org>
> Message-ID: <47153553.9080107 at aol.com>
> Content-Type: text/plain; charset=ISO-8859-1;
> format=flowed
> 
> Robert Bruninga wrote:
> > That is not the cause.  The cause is simply a bug
> in the
> > scanning program.  It stops scanning because the
> radio
> > transmits.  It will do this whether you have the
> auto-frequency
> > update enabled or not.  But I agree, It should not
> stop scanning
> > side B if side A transmits.
> >
> > Hopefully they can fix this in the next release.
> >
> > Bob, WB4APR
> >
> >   
> 
> 
> if both sides are in the same band (VHF/VHFor
> UHF/UHF) what would be the 
> point of continuing to scan during the APRS beacon,
> since all receivers 
> on the same band would be either muted or totally
> blocked by the APRS 
> transmitter.
> 
> Or do you mean that the scan fails to resume after
> the APRS beacon unkeys?

The latter.  According to the original poster, the
radio stops the memory scan and does not resume it
after the beacon goes out.  So you must either use PTT
mode (which defeats the purpose of automatic beacons
when you're not actively talking) or you must
constantly reach over and resume the scan manually
after every beacon.


> If the B-side frequency is inserted into the APRS
> beacon text and 
> beaconed every time the scan stops and dwells on a
> B-side channel for a 
> few seconds,  other APRS users are going to get a
> very "schitzy" effect, 
> with the 710 user appearing to be randomly on a
> different repeater  
> every time the APRS side beacons
> 
> It would appear to me that this feature of inserting
> the B-side 
> frequency into APRS beacons is basically useless if
> the B-side is in 
> scanning mode.     The firmware should automatically
> inhibit this 
> feature unless it sees the B-side staying put on a
> single frequency for 
> a specified amount of time (perhaps 1 minute or
> more).

I would agree.  My operating habit is to scan lots of
repeaters as I'm going about whether with my HT or my
mobile that way I can hear what's going on and I can
be reached if desired.  So I don't want my radio
beaconing out my frequency because it's always
changing.  The behavior of the D710 was suggesting
that this frequency insertion mode was trumping
whatever other operating method I wanted (namely no
frequency insertion and continuous memory scan) which
I found unacceptable.  But since it's a bug, then I'll
know to at least wait for the next set of radios to
ship with the bug fix before I consider getting one.



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