[OZAPRS] next APRS- UI digi question (1)

[Josh]

Hi Glen,

I'm sort of familiar with the RGI digi, Graeme VK2HFG runs an igate
north of Wagga and noted that when RGI went off-air, it effectively
isolated Griffith's APRS RF traffic IIRC.

I would not recommend adding a delay before digipeating. WB4APR outlined
a number of reasons against that approach here -
http://www.tapr.org/pipermail/aprssig/2013-March/041554.html

If you did want to implement a delay on digipeated frames you'd have to
set a DWAIT value on the channel, because digi'd frames are marked as
high priority so bypass the normal SLOTTIME and PERSIST delays. That
would also impact connected mode packets, and you wouldn't want that.

Direwolf has a default DEDUPE value of 30 seconds, but it only applies
to transmitted packets - not heard.
DEDUPE *will* prevent RGI from digipeating as WIDE1 and then again as
WIDE2 when RBM digis the original frame though because it only checks
the from, to and body fields for duplicates, ignoring the path.

- Josh VK2HFF


On 31/10/2017 7:13 PM, Glen English VK1XX wrote:
> Hi Josh
> 
> thanks. yeah lots of what I read is workarounds to deal with old TNC on
> mountains.
> 
> So with our canberra / ACT infrastructure, with have right now VK1RBM-1,
> it's an old TNC . I dont know how it is configured, precisely.
> 
> It has pretty good canberra metro coverage, right slap bang in the
> middle of town.
> 
> Then, a MACRO over all that is Mt Ginini, which the voice repeater on
> the site has a reliable 100km range, 200km to average base stations....
> (RHR is about 200km). it is REALLY wide.
> coverage over canberra metro is pretty reasonable also, but it is 50km
> from town.
> 
> Ginini I was told had rather outdated setups, from the 90s. As you know,
> a new dire wolf box and radio is ready to go, takes a bit of
> organisation to get to Ginini. 85km , weather etc
> 
> My question is how should I configure this up, IE specifically the UI
> DWAIT time- I think that's the parameter (or the Kantronics name for it)
> , IE do I want to have a long delay after it hears something to whether
> it decides to repeat it ? IE so the local RBM in metro canberra does the
> bulk of the UI work . But if say a 2 seconds goes past , ginini says,
> OK, no one local heard it, I will digipeat it
> 
> or is that sort of operation problematic ?
> 
> Or should locals have a specific configuration ?
> 
> ginini is often used for connected mode traffic from east (on the coast)
> to west of the country (say wagga, albury) . but it does its share of
> Hume Highway APRS work .
> 
> have more questions about this, but this is part 1.
> 
> wisdom sought.
> 
> with thanks,
> 
> glen
> 
> 
> 
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