[aprssig] HF APRS new ideas

[Chris Moulding]

"What we need are SMART HF 2-way IGates that will ONLY consider theseleves to be the "local" Igate for relaying that message if and only if IT heard the mobile in say ...the last say 10 minutes.  This would go a long way towards eliminating dupes from multiple two-way IGates."

That's not a bad idea. The reason I didn't make the HF Igating two way in APRS Messenger was because all Igates that heard the remote station would transmit a reply together. I'll look at adding a "SMART" function to the program over the next week. It's worth trying.

73,

Chris, G4HYG

--

Chris Moulding
Cross Country Wireless
7 Thirlmere Grove, Bolton, Lancs, BL4 0QB, UK
Tel/fax: +44(0)1204 410626
Mobile:  +44(0)7752 391908
Website: http://www.crosscountrywireless.net



On 31/05/10 13:29, Bob Bruninga wrote:
> I'm bringing thso over from the UIview list for discussion:
>
>    
>>> I am using the path APRS,GATE,WIDE2-1.
>>> My goal is to learn how things work on HF
>>> and find out the best path for a mobile station.
>>>        
> I wonder if it that path is now completely obsolete.  We used that back in 1994 time frame when there was no APRS internet and so the only stations that saw HF stations were other HF stations.  Using that path allowed them to be seen back on VHF in local range of a HF-VHF gateway.
>
> There is no need for that now.  I assume most fixed HF stations would feed the internet directy. And eliminating the FOURTEEN extra bytes that the above path requires would have a tremendous improvement on the packets reliabiilty.  The number one killer on HF is packet length.  Eliminating those 14 bytes on short packets would be only logical.
>
>    
>>> Also to finally set set up a receive only Igate
>>> for HF stations in conjuction with my existing VHF
>>> station.
>>>        
> This is a big problem.  APRS needs two-way IGates in order for the network to deliver messages to mobiles.  Without two-way, then the network is broken.  However, we also do not want multiple two-way Igates transmitting the same mesasge to the mobile who will hear a collision.
>
> What we need are SMART HF 2-way IGates that will ONLY consider theseleves to be the "local" Igate for relaying that message if and only if IT heard the mobile in say ...the last say 10 minutes.  This would go a long way towards eliminating dupes from multiple two-way IGates.
>
> Only the one with immediate NOW propogation to the mobile would send the messge.
>
> Can someone comment on how well something like this can be managed with most existing IGate packages?  Can the statistics of their "HEARD LOCAL" list be used smartly?
>
> Bob, WB4APR
>
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