Telcall’s - direct dial telephone calls
Transceivers equipped with telcall can direct dial telephone numbers and receive calls from
telephone users through a Barrett 660/960 telephone interconnect system. The 660/960 is a
radiotelephone interface, designed specifically for HF use. The 660/960 allows any Barrett
transceiver fitted with a telcall selective calling facility to access the telephone network
without operator assistance.
Note:-
For telcall functions to operate the transceiver must be fitted with the selcall /
telcall option and the channels enabled for selcall operation.
If ALE is in use refer to the ALE section for details on the integration of the ALE
and normal selcall and telcall.
Channel selection is a critical factor in using the 660/960 telcall system. To enable channels
to be evaluated the 660/960 telephone interconnect has a beacon facility which allows a
station in an HF network to send a special selcall code that causes the 660/960 to send a
beacon signal. The quality of the beacon signal received by the HF out-station is indicative
of the quality of communication that can be expected on the channel in use. (refer to Selcall
(selective call) section - Beacon call).
To access preset telephone numbers on the Barrett 660/960 a standard selcall is
transmitted from the Barrett 950. The first two digits of the destination ID must be the same
as the first two digits of the 660/960 self ID being called. The second two digits correspond
to one of the 98 preset numbers stored in the 660/960 telephone interconnect.
-
select the channel to be used to make the call (refer to Selcall (selective call)
section -
)
-
listen for traffic on that channel, if no traffic then continue
-
press the
key
-
enter the selcall number corresponding to the preset telephone number required
using the numeric keys
-
press the
key
-
when the selcall has finished sending, listen for revertive tones that indicate the
call was successful.
-
if the call was successful then wait for a telephone connection to be made. When
the call has been answered, the user can talk as normal.
-
after the call is complete or the line is busy the user should hang up the line.
(Refer to Selcall (selective call) section -”
")
Beacon call
Sending a Telcall
Preset dialling
“Beacon call”
Hang-up call
BARRETT 950 HF TRANSCEIVER
PAGE 19
