[aprssig] APRS Messenger Android released

Robert Bruninga bruninga at usna.edu
Thu Jun 13 09:17:25 CDT 2013


For events, I always recommend 1 minute reporting... but recognizing
that the channel can only support about 12 such cars operating simplex
(no digis) or maybe 6 of them operating via 1 hop.  Any higher rate or
# of cars will reduce reliability.

Unless you go to Split operation (Digi's inpu on 144.99 and output on
144.39, then you can double the one-hop rate back up to 12 cars...

The idea is, for max reliablity y ou only want the channel 20% loaded.
 Or you can use time slotting to significantly increase this.

Bob, WB4APR

On Wed, Jun 12, 2013 at 9:43 PM, Eric Lorenz K9LGE <k9lge at emlorenz.com> wrote:
> Hi Bob,
>
> Ok, I think I understand that (still learning the ins and outs of APRS). The
> perspective I was coming from...for the application I was thinking of
> (tracking SAG positions of vehicles in a public service event) a 3 minute
> beacon would be problematic...as we are trying to accurately track position
> for deployment purposes- we generally try to either use Smartbeaconing, or
> set beacon rates of 30 secs to 1 minute.
>
> Eric K9LGE
>
> Eric Lorenz
> Communications/Safety Chair
> American Diabetes Association
> Tour de Cure/Chicago
>
> On Jun 12, 2013 7:15 PM, "Robert Bruninga" <bruninga at usna.edu> wrote:
>>
>> > Just out of curiosity...any reason why you chose to have one fixed
>> > beacon
>> > rate?
>>
>> Some of us like the deterministic nature of fixed rates.  It provides
>> all kinds of useful information.
>>
>> 1) You can know when to expect an update
>> 2) You can easily judge coverage by looking at the separation of dots
>> 3) You can easily see speed by looking at the separati of dots
>> 4) You can judge network performance and consistancy
>> 5) Your performance is deterministic.
>> 6) Expectations are consistent
>>
>> Bob, WB4APR
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>
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