[OZAPRS] on density and stomping
vk2tv
vk2tv at exemail.com.au
Tue Nov 7 12:56:37 AEDT 2017
I got it
I got it
I got it
Mmm, one of my replies is missing.
On 07/11/17 12:29, Scott Evans wrote:
>
> He Ray it's like...
>
> Here's a joke about UDP.
> Did you get it?
> Did you get it?
> Did you get it?
> Did you get it?
>
>
> On Tue., 7 Nov. 2017, 12:18 vk2tv, <vk2tv at exemail.com.au
> <mailto:vk2tv at exemail.com.au>> wrote:
>
> All aprs is UI mode, there's no connected mode (with ACK,RR, RNR,
> etc) as we relate it to packet.
>
> My restricted experience with aprs messaging is it's very much hit
> and miss but maybe that's a network fault rather than the aprs
> protocol. Still, I like the connected mode aspect of packet for
> confidence.
>
> Ray vk2tv
>
>
> On 07/11/17 10:58, Glen English VK1XX wrote:
>> agreed
>>
>> Like for the person looking at their D700 to see what is going on.
>>
>> They almost need a specific download channel. IE outbound only feed with
>> continuous regional position updates on it.
>>
>> Surely all station to station messaging is connected mode ?
>>
>> As a single UI message might as well be transmitted into a dummy load.
>> Or is there a protocol wrapped around UI ?
>>
>>
>>
>> On 7/11/2017 10:52 AM, Matthew Cook 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 <mailto:glenlist at pacificmedia.com.au> <mailto:glenlist at pacificmedia.com.au>
>>> <mailto: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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