9
If the '*' key is recognised the receiver noise will disappear. Some DTMF telephones do not send the '*' and '#'
tones. This should be tested before the system is first used.
Then enter the 4 digit Selcall of the transceiver you wish to contact followed by two '#' key presses (only one '#' press
is necessary on Level 1 Interconnects). The tones of the selcall being sent will now be heard. Note: ID's 9900 to
9999 are reserved for ALE calls. See "Sending an ALE call".
If the entered ID does not have the access level to receive Selcalls then the ‘Access Denied’ pre-recorded message
will be played and the Selcall not sent.
After the Selcall has been sent, if the transceiver with that Selcall ID is on channel, a confirmation tone (revertive
tone) will be heard. The telephone user should then wait for the transceiver operator to make voice contact. If no
voice contact is made, a telephone number to call back on can be sent to the HF station using the 'Sending a Telcall'
procedure.
If no audible acknowledgment tones are heard, the transceiver may be on another channel, or switched off. To try
to make contact on another channel, follow the 'Selecting a Channel' procedure, then repeat the 'Making a Selcall'
procedure.
If you wish to send the same Selcall number again, press ‘**’.
Sending a Telcall
In the event that a transceiver responds to a Selcall, but no voice contact is established, indicating the operator is
not available, a ring back telephone number can be sent to the HF station transceiver and stored in its memory. On
the HF station operators return he can return the call. This facility is not available on Level 1 Interconnects
A Telcall can only be made to a HF station that has an access level required for direct dialling on the PSTN.
To send a Telcall:-
Press '*' followed by the 4 digit Selcall number, then press '#'.
Enter the desired telephone number (up to 16 digits long) and then press '#' again.
The Telcall will then be sent and the telephone number will be stored in the HF station transceivers "Selcall
history".
An audible acknowledgment will be heard if the call was successful.
If the HF station does not have the access level required for this operation the ‘Access Denied’ pre-recorded
message will be heard and no action will be taken.
Using the Voice Operated Switch (VOX)
The transceiver being operated by the Barrett 960 telephone interconnect is usually switched between transmit and
receive using the telephone subscribers voice to derive the switching signal. This is achieved using a specialised
VOX (voice operated switch). If however the telephone is of bad quality then a manual method to switch between
transmit and receive is available. To switch to the manual method press "88" on the telephone key pad. The internal
synthesised voice will annunciate "OFF" indicating automatic VOX is off and you are now in a "manual VOX mode".
In the manual mode to key the transceiver into transmit press the "#" key on the telephone keypad. When you finish
talking again press the "#" key, the transceiver will now be in receive mode. i.e. using the "#" key on the telephone
keypad is the similar to the microphone Press To Talk (PTT) button, except it only has to be pressed momentarily
to switch between transmit and receive and visa versa.
To return to "automatic VOX mode" press "88" again on the telephone keypad, the internal synthesised voice will
annunciate "ON" indicating automatic VOX is on again.
Requesting current channel information
The telephone subscriber can request the 960 to annunciate the current channel's number and frequency
information using its internal synthesised voice by entering
77
on their telephone keypad.
