INSTALLATION
Carefully remove the amplifier from it’s shipping carton and inspect for any damage. The am-
plifier should be installed in a place that allows good ventilation and provides a suitable base
to support it. Failure to allow for good ventilation will cause the amplifier to overheat and shut
down prematurely. Air is drawn into the amplifier from both the underside and top cover of
the amplifier so do not place any objects underneath or on top of the amplifier that may restrict
these intakes.
A short 50 ohm patch lead should be used to connect the output of the transceiver to the RTX
input (
\
) on the rear panel. The length of this cable is not critical but should be as short as
practically possible. The ANT output (
[
) SO239 connector should be connected to a resonant
antenna suitable for the band being used. ( If the antenna is not resonant the output should be
connected to a SWR / Power meter and then to a suitable Antenna Tuning Unit (ATU/AMU).
Verify that the antenna / ATU being used is suitably rated for the power output of the amplifier.
(The VSWR of the antenna should not change very much from low or high power use).
If the antenna requires matching for the transmission frequency this should always be carried
out at low power before the amplifier is switched to Operate mode.
The amplifier may be used with or without the PTT input (
_
) connected to the transceiver
however the default state of the BLA350 plus is that the PTT must be connected in order to
amplify the signal. It is always recommended especially for SSB and CW modes that the PTT
connection is made, however if the transceiver has no PTT output facility then the amplifier
may be used without. See VOX menu, page 7.
The BLA350 plus may also have it’s ALC output (
^
) connected to the transceiver in order to
regulate the input power supplied to the amplifier. See ALC menu.
The output power of the drive radio, if no ALC connection is made to the transceiver , must be
reduced manually on the transceiver to 10W, if the transceiver is capable of more power.
Connection to the AC supply.
The BLA350 plus features an internal power supply and can operate from the mains AC net-
work with a voltage between 200 and 250Vac 50/60Hz. Before connecting the BLA350 plus to
the AC network verify that the AC voltage is in accordance with that which is printed on the
rear panel of the BLA350 Plus.
The use of the BLA350 Plus with an AC line voltage outside of that stated may result in per-
manent damage. The warranty does not cover damage sustained from this condition or from
the use of incorrect fuses.
The BLA350 must be connected directly to the AC network with the supplied AC cable, The
use of adapters, extension cords should be avoided.
Ground:
It is beyond the scope of this manual to provide a definitive guide into the contro-
versial subject of RF grounding, as it is a subject all to itself and very much
4
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