Specifications

By prefixing the first <CR> with <CTRL-V>, you send it all at once,
while maintaining the <CR> as part of the text. The PASS character
can be useful in formatting text Messages such as CTEXT as well.
4.4.8 Packet Transmit Timing
Your PK-900 has a number of built-in timers used to control the
packet protocol and transmit timing. The default values have been set
at the factory to provide reasonable performance, but the values may
not be optimum for your local area. Most protocol parameters should
be adjusted only after carefully reading about them later in the
chapter. You SHOULD however adjust TXDELAY for your transmitter as
indicated below.
4.4.8.1 TXDELAY and AUDELAY
Radios vary in the time it takes to switch from receive to transmit.
If your PK-900 starts sending data before your transmitter is up to
power, the packet will not be received properly at the distant end.
TXDELAY controls the delay between your transmitter's key-up and the
moment when your PK-900 starts sending data. The default value of
30 corresponds to a time of 300 ms and works with most VHF/UHF FM
transceivers. With modern transceivers TXDELAY can often be reduced
which will improve packet performance in your area. You should
perform the following procedure to optimize TXDELAY for your radio.
o Find another station who can reliably digipeat your signals.
o Set your UNPROTO path to TEST via the callsign of the station who
can digipeat your signals. Example: UNPROTO TEST VIA WX2ABC
o Set the MONITOR command to at least 1.
o Go to CONVERSE mode and send a few packets by pressing the
<Enter> key. Note that you should see them on your own screen
when they are digipeated by the other station.
o Start reducing TXDELAY by units of 5 each time making sure the
other station is still digipeating ALL your UNPROTO packets.
Eventually you will find a value where the other station can no
longer copy your packets to digipeat them.
o When this happens, increase TXDELAY in units of one or two until
the other station again digipeats ALL of your packets. This will
be the optimum setting of TXDELAY.
After TXDELAY is adjusted as indicated above you may want to adjust
the audio delay (AUDELAY) as indicated in the Command Summary.
The next sections of this chapter will discuss some of the more
advanced packet features including Multiple Connects, Packet Timing
and Protocol, and HF Packet Operation.
4.4.8.2 AXDELAY and AXHANG
Although it is not common, packet can be used through voice repeaters.
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