[aprssig] RE: Not Receiving Messages from APRS-IS (Pete LoveallAE5PL Lists)

Keith VE7GDH ve7gdh at rac.ca
Mon May 19 17:28:25 CDT 2008

Jeff N0JUH wrote...

> When an igate send a message to RF, I'm sure it must signal other
> igates not to send that message anymore. But I would think that it
> would wait for an ack before it did that.

That's not the way it works. Messages that make it to theh APRS-IS are 
available to all IGates. It i the IGate that must be properly programmed 
to send messages to local stations, and it is the IGate operator that 
determines what is local... i.e. heard direct, heard via 1 hop, heard 
via 2 hops etc. Conceivably, two adjacent IGates could be gating traffic 
to the same mobile station.

> If an IGATE sends a message to RF, can I track that event on findu et 
> al?

I don't believe so. You would have to look at raw data from the 
originating station and from the destination station to look at the sent 
message or at the acks.

> ...but I also have problems getting acks from EMAIL...

For messages sent to EMAIL, you would need to make it to an IGate to be 

> ...If anyone has the time, please send a message to N0JUH-1...

I just sent a message. It looks like you uare two hops away from an 
IGate. Success will depend on whether one or more IGates consider you 
are local, and upon conditions / propagation / packet collisions. I 
didn't get an ACK, so I'll try a few more times.

You could contact the nearest IGate operators and ask them if they gate 
traffic to local stations (as they should!!!!!!) and what they consider 
local... i.e. direct, 1 hop, 2 hops etc.

73 es cul - Keith VE7GDH
"I may be lost, but I know exactly where I am!" 

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