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2. GENERAL INFORMATION
(Read the specific chapters for more details).
2.1 Power supply
The amplifier uses a switching power supply that will automatically adapt to any voltage
that is between 100 and 255 Vac.
The main switch [I/O] is located on the rear panel.
In the [O] position all the internal circuitry is powered off, in the [I] position (red led ON)
some internal voltages are now present allowing for you to turn ON or turn OFF the
linear amplifier in one of the following ways:
a) Using the [ON]/[ OFF] keys on the front panel.
b) Applying / removing 9 -15 VDC on pin (8) of the CAT connector (see note
below).
c) Using the USB port and the management software. It is possible to download
this software from the website www.linear-amplifier.com .
Note: When turned ON, almost all transceivers output 13.8 VDC. With this voltage, the linear
amplifier can be turned automatically ON / OFF at the same time as the transceiver.
Note: The fuse is located inside the amplifier (remove the lower cover).
2.2 Input / Output
The linear amplifier has two inputs (INPUT 1, INPUT 2) to which you can connect two
transceivers of any brand or type.
These inputs are selected with the [INPUT] key or automatically with the PTT of each
transceiver.
The amplifier can manage up to four antennas (ANT 1, ANT 2, ANT 3, ANT 4).
It selects the antennas automatically.
The SO2R functionality is implemented by its dedicated connector.
2.3 ALC / RELAY / CAT
There are two transceiver inputs (IN 1, IN 2), allowing two distinct transceivers to be
connected at the same time.
ALC Is a negative voltage generated by the amplifier. It is used to control the
output power of the transceiver (max. in STANDBY”, the required power in
“OPERATE”).
In this way the power from the exciter will be regulated automatically without
having to set it.
. If the ALC port is not connected, it is very important to manually adjust the
drive from the transceiver as overdriving can cause damage to the amplifier.
This link is highly recommended.
RELAY This essential link allows the amplifier to be put in the transmit state.
To do that, it is necessary that the inner pin of the phono connector is
switched to the signal ground. This is normally done by the transceiver with
either a “close-to-ground” relay, or an open-collector transistor.
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