[OZAPRS] on density and stomping

[Andrew Rich]

Same old problem

I use my iPhone 

Sent from my iPhone

> On 7 Nov 2017, at 9:52 am, Matthew Cook <vk5zm at bistre.net> wrote:
> 
> One of the downsides of multiple RX only iGates as has been found in Adelaide recently is they only benefit internet based observers.
> 
> You also loose capabilities like two way messaging and create confusion as to where users are with internet to RF gateways and delays.
> 
> There's been a few times recently where users have messaged me over APRS in Adelaide that was gated to the net by a RX only iGate that was then fired back onto RF, only for my reply to never be received.
> 
> A well designed Wide2-n network with good coverage and Wide1-n's to over come terrain issues sounds like a good plan and a lot of fun.
> 
> 73
> 
> Matthew
> VK5ZM
> 
>> On 7 November 2017 at 08:14, Glen English VK1XX <glenlist at pacificmedia.com.au> wrote:
>> Hi Ray
>> 
>> The stomping is a good point.  it's sort of like having a diversity
>> receiver. Instead of an RF fade, we have channel contention.  Actually,
>> in theory, multiple I-gate RX around town in a  dense area can provide
>> an increase in traffic density capability, as the n signals will compete
>> at different sites and some will win/loose  due to terrain shielding and
>> also flat fading short delay multipath.
>> 
>> Since too many I gates is no problem, Ginini will have Igate as well as
>> RF forwarding. The 50kbps half duplex IP link will carry that no problem.
>> 
>> Being open source code, we can add / modify as required. Isaacs will be
>> identical HW eventually.
>> 
>> glen
>> 
>> On 7/11/2017 8:14 AM, vk2tv wrote:
>> >
>> > Glen
>> >
>> > I wasn't thinking of the digi only responding to its real callsign, it
>> > will do that in any case AFAIK. I was thinking of the case where
>> > (local) users specify the digis real callsign in their path to keep
>> > their traffic "local".
>> >
>> > There's a lot of discussion about rgi and possible effects of outbound
>> > traffic from it but we also need to consider the benefits of having a
>> > well-sited W2-1 (say) Igate to respond to inbound traffic that might
>> > have been stomped on at another system(s).
>> >
>> > Ray vk2tv
>> >
>> >
>> >
>> > On 06/11/17 20:18, Glen English VK1XX wrote:
>> >> yeah, I would guess addr, WIDE1-1, VK1RGI-1 would do it
>> >>
>> >> another thing to change on the client .
>> >>
>> >> again, pity more cannot be gleaned by the digi beacon.
>> >>
>> >> alternatively, the system could have a list of locals...
>> >>
>> >> cheers
>> >>
>> >>
>> >>
>> >> On 6/11/2017 6:36 PM, vk2tv wrote:
>> >>> Doesn't the aprs specification provide for a station to direct traffic
>> >>> via a specific digi callsign instead of the generic WIDEx-x to
>> >>> minimise spread?
>> >>>
>> >>> Ray vk2tv
>> >>>
>> >>>
>> >>> On 06/11/17 18:03, Glen English VK1XX wrote:
>> >>>> All
>> >>>>
>> >>>> thanks Josh,Ian, Dom, Ray for the inputs, and asking me good questions
>> >>>> for me to think about.
>> >>>>
>> >>>> I'll read a bit more into USA centric & written articles.
>> >>>>
>> >>>> I think I will filter 1RBM (local cbr) and 1RGI from duplicating
>> >>>> everything. Or at least have a think about it. There really needs to be
>> >>>> a setup for users if they really do want 1RGI is digipeat their 1RBM
>> >>>> UIs. I guess that's what WIDE2-2 is for.
>> >>>>
>> >>>> Also got to think of the reverse case... RBM hearing things that I
>> >>>> expect Ginini to hear and not . That of course can happen any time for a
>> >>>> mobile station, long and short delay multipath abundant.
>> >>>>
>> >>>> In about 90% of canberra cases, 1RGI will hear whatever 1RBM hears no
>> >>>> problem...
>> >>>>
>> >>>> There there is the providing redundancy issue for other paths.  Ether
>> >>>> way, IP link and full control will make things flexible.
>> >>>>
>> >>>> There's a double edge sword with terminals being dumb /simple and say
>> >>>> unable to update their paths based on whatever they are hearing- there
>> >>>> would be usefulness I would have thought in having the digi beacon spit
>> >>>> out some useful information for UI stations.... or maybe there has been
>> >>>> thought and it didnt catch on.
>> >>>>
>> >>>> I'll put UHF on the second sound card/dire wolf TNC channel, that will
>> >>>> be useful.
>> >>>>
>> >>>> -glen
>> >>>>
>> >>>>
>> >>>>
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