Timewave PK-232MBX, Руководство по эксплуатации, Страница: 90 / 231

PK-232 MBX – OPERATING MANUAL AMTOR AND NAVTEX OPERATION
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7.3.3
Answering an FEC AMTOR CQ
Normally when you see a station calling CQ in FEC AMTOR, you will want to answer him
using ARQ AMTOR. Remember that ARQ AMTOR is the protocol that reduces the chance
of transmission errors. Let's assume you hear NNML calling CQ. To answer, do the follow-
ing:
o If you are using an Timewave PAKRATT program, check the program manual for in-
structions on starting an ARQ AMTOR contact.
o If you are using a terminal simply type ARQ NNML<Enter> " to start a CCIR 476
ARQ contact, or ARQ VTMFFFF<Enter> to start a CCIR 625 ARQ contact.
After your PK-232 has locked or synchronized with the distant station, you may begin your
conversation.
N7ML N7ML DE (YOURCAL) (YOURCAL) ... etc.
7.3.4 ARQ AMTOR Operating Fundamentals
When you finish typing your comments or traffic to the other station and wish the distant
station to transmit to you
Do Not type KKK or anything like that!
o Do type a plus sign immediately followed by a question mark ( +? ).
"+?" is a software changeover command that switches your system from being the "Infor-
mation Sending Station" (ISS) to the "Information Receiving Station" (IRS), and switches
the distant system from being the IRS to being the ISS. When your distant partner sees
the "+?" he knows he can begin typing comments or traffic.
NOTE:
When discussing ARQ operation, we use the terms "Information Sending
Station" and "Information Receiving Station" instead of "transmit" and "re-
ceive" since in ARQ AMTOR both stations are rapidly switching from transmit
to receive.
o Don't bother with multiple call signs and "over-to-you" routines or "KKK" used in
Baudot and ASCII RTTY operation. The system does it all for you when you type the
"+?".
The FCC requires station identification once every ten minutes. It's sufficient to begin with
QRA (mycall) or end your transmission with QRA (mycall) before the +? changeover code,
or use the <CTRL-B> "HERE-IS" to send your own Auto-AnswerBack message.
7.3.5 Ending an ARQ AMTOR Contact
When you've finished your "final finals" to the distant station and both stations are ready
to end the Mode A (ARQ) contact, you can end the contact and terminate the link in se-
veral different ways:
o Type <CTRL-C> to return to Command Mode, then type R to break the link.
The "R" command breaks the ARQ link immediately and returns your system to
AMTOR Standby. This can be used as an "Emergency Shutdown" if you need to take
your transmitter off the air.