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Supressing multiple message ACK's (NOT)
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APRS ACKS every copy of a message they get, including dupes.
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This is because ACKS have to go via the network TWICE and have that squared lower probilibty of getting completed. If the network is giving 50% reliability at each digi, the chance of getting back an ACK is only 6%. Hence every copy gets an ack, and yet the probability that a message gets to the recipient is still far greater than the chance of the ack getting back on a typical APRS network. In the above example, the chance of message delivery is 25% or four times higher. So people should NOT wait for an ACK if they already see someone reply to their message. The message from a human sent back will have a far higher probability of getting through than will an ack. (25% compared to 6%). And for that reason, EVERY one who receives and APRS message should do the courtesy of sending a human response. AND there's more. We invented the RELAY-ACK over a decade ago that further adds duplicate copies of ACKS embedded in outgoing messages. So two people that are in message dialog will have far grater success than those that just send one-way messages and expect only an ACK to verify receipt. Please do the courtesy of sending back a human response to incoming messages. AND turn off those stupid REPLY MESSAGS. They provide nothing useful in most cases except more QRM on the network. Bob, WB4APR -----Original Message-----
From: ui-view@... [mailto:ui-view@...] Sent: Monday, March 13, 2017 8:26 AM To: ui-view@... Subject: RE: [UI-View] Supressing multiple message ACK's Sequence is as follows: If all is as above, there is no extra ACK. A (the T3) sends the message. BI think the extra ack that Jim is on about is the ack of the digi'd message; since B has already ack'ed the message which was received direct. I think he is querying why an ack is also sent for the same message that is received via the digi after the ack to the direct version of the same message has been sent. 73 Jeff G8HUL ------------------------------------ Posted by: jeff 1 <g8hul@...> ------------------------------------ Please do not top post, and trim quoted text as much as possible. UI-View website: UI-View Registration: Select language & fill in your name and call sign. Return later to collect your registration. APRS Server List: To update the APRS Server List, change the download URL to... aprs2.net/APRServe2.txt For North American users, PMap 9 (Precision Mapping 9.0) along with PMapServer 9 can provide street level mapping for all of North America. They can be installed without hassle on Windows 7 & 8. PMapServer is available for download on the UI-View website. However, Undertow Software is no longer selling new copies of PMap 9, but existing owners can continue to use it as long as they can get it registered. Users of anything newer than Windows XP should not install UI-View below Program Files. Instead, create a folder elsewhere. To view UI-View's built-in context sensitive help file, download and install WinHlp32.exe. Stephen WA8LMF has many useful hints and tips about setting up and using UI-View on website: ------------------------------------ Yahoo Groups Links |
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