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USER'S GUIDE
APPENDIX C – INTERNATIONAL HF AMTOR CALLING FREQUENCIES
Since the earliest days of AMTOR (around 1977), AMTOR operators around the world have agreed
on the use of certain informal, internationally recognized calling channels. This is similar to the
conventional operating methods of the commercial stations using SITOR the ancestor of AMTOR.
The Concept and the Need
The 'calling channel' concept is just that – worldwide recognition of channels reserved for stations
to make their initial calls. Stations transmit their CQ or other general broadcast calls on a fre-
quency established as the frequency to which all hands will remain tuned and monitoring.
In this way, any operator can know in advance that the station with which contact is desired can
be readily accessed - you can't raise another station by sending the SELCAL on a channel that the
distant station may not be actively monitoring.
The Discipline
After initial contact is made, both stations involved in the contact quickly move off to another
channel to continue their communication.
The calling channel should not be used as a working channel. Calling channels should not be used
for testing or lengthy conversations. Automatic beacon transmissions should not be used on the
calling channel.
Stations wishing to operate computer-based message storage or mailbox systems on these calling
channels should provide automatic means of causing the system to change frequency and relocate
both the calling station and the mailbox to another channel, thus leaving the calling channel free
for other stations.
The Channels
80 METERS: 3588
40 METERS: 7045
30 METERS: 10143
20 METERS: 14075
15 METERS: 21075
10 METERS: 28075
PK232UG Rev. E 9/87
3637.5
7075
21100
21115
INTERNATIONAL HF AMTOR CALLING FREQUENCIES
C-1
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