HF-90 Operation & Installation Guide
TA-90 autotune system
Changing channel and transmitting
When using the HF-90 in conjunction with the TA-90
autotune system (for vehicle use) there are certain operating
characteristics which you should be aware of. In short,
whenever the HF-90 transmits for the first time on a given
channel (prior to a channel change), the TA-90 Tuner will
enter its tune sequence. As the TA-90 tunes, you will hear a
high pitched tone for a few seconds (only if your volume
level has not been muted), after which voice
communications can commence as normal.
If you are scanning channels when you receive a valid
Selcall/Telcall or Beacon Request, the HF-90 will stop
scanning, lock on the relevant channel and the TA-90 will
enter its tune sequence prior to transmitting the Selcall/
Telcall Confirmation or Beacon.
Receiving Selcall/Telcall or Beacon Request in scan mode
When you change channel and then press the PTT switch on
your microphone/handset to transmit for the first time, you
will hear the TA-90 enter its tune sequence (as outlined
above).
Aside from pressing the PTT switch, your HF-90 also
transmits when receiving a valid Selcall/Telcall or Beacon
Request. It transmits by way of a Selcall/Telcall
Confirmation or Beacon back to the originating radio (refer
to Section 6 in this Guide). When this happens, and you
have not transmitted previously on the given channel, the
TA-90 enters its tune sequence prior to transmitting.
7 . C O M P A T I B L E P R O D U C
7 . C O M P A T I B L E P R O D U C
7 . C O M P A T I B L E P R O D U C
7 . C O M P A T I B L E P R O D U C T S
T S
T S
T S
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Section 7.1
