NON RESONANT
ANTENNA TUNING WARNING!!!!
When using the BLA350 Plus amplifier together with a non resonant antenna and either a
manual or automatic antenna tuner it is very important the following precautions are taken.
The correct sequence for connection would be Transceiver, BLA350 Plus Amplifier, VSWR/
Power meter, ATU and Antenna
If using a transceiver with a built in ATU this function should be disabled if possible or oper-
ated in through mode as the input to the BLA350 amplifier is 50 Ohms. The internal ATU can
no longer tune the antenna.
Tuning of a non resonant antenna should always and only be performed at low power. Most
antenna tuners have a particular power rating and usually this maximum power rating is
quoted under tuned conditions. With the amplifier connected in line this should be done with
the amplifier either off or in stand by mode. Once an acceptable match has been provided
equal to 1.5:1 or better the amplifier may then be operated and the tuner may then be ad-
justed slightly to optimise the match. If this method is not followed and the antenna is tuned
with the amplifier running at full output the high impedances possible during the tuning proc-
ess can cause damage to the amplifiers output transistors and should be avoided at all
costs. Failure to follow this procedure may well result in damage to the amplifier that is not
covered by the warranty
Quick Start Guide
1.
Connect the RTX input connector (
\
) to the transceiver with a 50 ohm patch cable.
2.
Connect the ANT output connector (
[
) of the BLA350 Plus to VSWR/Power meter and ATU if
required or directly to the antenna if resonant at the operating frequency desired.
3.
Connect the PTT output cable from the transceiver to the PTT input (
_
) of the BLA350 plus.
(BLA350 Plus PTT input is Active Low).
4.
Make sure the ON / OFF switch (
a
) is set to OFF, Switch (
_
) MAN (Manual) / AUT (Automatic)
is set to ‘AUT’ and that switch (
\
) Stby (Standby) / AUT (Automatic) is set to Stby.
5.
Connect the AC power cord to the amplifier (
`
) and household AC outlet .
6.
Make sure that the amplifier is OFF (
a
) or in Standby mode (
\
).
7.
Adjust the transceivers output to 10W, if capable of more than 10W output.
8.
Test that the antenna connected is correct or tuned for the current frequency selected. If necessary
match the antenna to the desired frequency with the ATU. This must be done with the amplifier
switched off or in standby mode.
9.
Switch the Stby / ON switch (
\
) to ON.
10. Now when the PTT on the transceiver is pressed the amplifier will switch to TX, indicated by the
front panel LED (
d
) and an indication of the output power (
b
).
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Содержание BLA350 PLUS
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