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Sending and Receiving APRS Messages
Message receipt acknowledgement (ACK)
When a message is sent to a specific partner station, an ACK packet (receipt
acknowledgement) will be returned to acknowledge receipt of the message by the partner
station. The transmission process ends when an ACK packet is returned by the partner
station. When an ACK packet is not returned by the partner station within one minute
after the message is sent, the same message will be resent up to 5 times. When an ACK
packet is not returned even after 5 times, the transceiver will go into the "TX OUT" state.
The remaining transmission count of the message is displayed as shown below. The
remaining transmission count can also be checked from the transmission details screen.
Remaining count display
Displaying the remaining transmission count
“MESSAGE LIST” screen
(when the number of transmissions remaining is four)
Message details screen
(when the number of transmissions remaining is four)
Displaying the remaining transmission count
“
✽
” is displayed when an acknowledgement is received
“.” is displayed during TX OUT
No display when an acknowledgement is received
“OUT” is displayed during TX OUT
• A maximum of 100 messages can be registered in the message list. However,
since this is used for both sent and received messages, the oldest message is
automatically deleted when the number of messages exceed 100 (unread messages
and sent messages will be deleted).
• When the frequency display screen is displayed, a receipt confirmation sound is
heard when an ACK packet is returned from a partner station, and the pop-up screen
in the figure on the right will be displayed at the same time (when “2 MESSAGE”
under
[10 APRS]
→
[7 APRS POP-UP]
in the set-up menu is set to anything except
OFF).
