INDEX Page. 12 of 92
RELAY This essential port allows the amplifier to be switched into the transmit state.
To do that, the inner pin of the RCA phono connector must be switched to
ground potential. This is normally done by the transceiver with either a “close-
to-ground” relay, or an open-collector transistor.
On the transceiver-side this link is often called SEND, PTT or TX GND.
Refer to your transceiver manual for more details.
Max current needed is only 2 mA or less.
CAT This port is highly recommended
Thanks to this port the linear amplifier will detect, while in the receive mode,
the operating frequency of the transceiver and then automatically
control changes of band, antenna and automatic antenna Tuner.
All modern transceivers have CAT control options.
In older models, often elementary analog or digital information is sent from
the transceiver to the amplifier for band switching only.
To facilitate any possible connection, there is also a very efficient frequency
meter in the amplifier.
The management of the band, the antennas and the Tuner is implemented in
the Expert with one of the following choices:
a) Through “CAT”, present in all recent transceivers. Band and sub-band are
automatically selected by the receiving transceiver without the aid of the
internal counter.
ABSOLUTELY RECOMMENDED SOLUTION AS IT IS THE MOST SAFE
AND TECHNICALLY CORRECT.
b) Using "BAND DATA", in this case the band is automatically set by the
transceiver while the internal frequency meter will select only the
sub-band during transmission.
c) Through “NONE” in the absence of a suitable data connection with the
transceiver. The fact that this condition does not require any connection
might seem a simplification, in reality this choice is not recommended
because band and sub-band will be selected by the internal frequency
meter only during transmission.
Use this condition only if the choices a) and b) are NOT PRACTICAL.
GIVING THE POWER MANAGED , A DANGER CONDITIONS COULD BE
VERIFIED, IN PARTICULAR BAND CHANGES IF DONE IN OPERATE.
IT IS STRONGLY RECOMMENDED TO DO THIS IN STANDBY.
NOT FOLLOWING THIS RECOMMENDATION WILL BE CONSIDERED
"MISUSE" OF THE EQUIPMENT WITH CONSEQUENT LOSS OF
WARRANTY (an indelible internal log records every condition).
In condition c) also avoid putting two transmitting antennas very close
operating simultaneously on different bands, the resulting strong
signals could generate undue band changes or SWR alarms.
Note: In some transceivers the “RELAY” and “CAT” signals are activated by a
selection in the menu: in that case, please refer to their user’s manuals.
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