Operation - RM Italy BLA600 User Manual

The radio must be capable of about 40W to obtain full output on all bands.
Generally around 20W is sufficient for full output on the bands 80 to 10m). More
power is required on 160m and 6m for full output. Due to the accurate frequency
reading and high speed band switching of the BLA600 a CAT interface connection is
not required for automatic band change. A high speed PIN Diode switch is used so
the amplifier will switch back to bypass briefly whilst the Low Pass Filter relays
insert a different filter, so at no point are any relays hot switched thus avoiding
possible contact damage from arching and presenting the amplifier briefly with an
open circuit load. The amplifier is supplied with the default antenna output as
antenna 1 for all bands, so we suggest that for initial testing this output should
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not be changed. We also recommend that the first test should be carried out with the
output connected directly to a power meter / dummy load whist familiarity is gained
with the operation of the amplifier.

8. Operation:

With the amplifier in 'Standby' or connected in line but physically switched off a
maximum of 100W may be used. With the amplifier switched off antenna 1 is the
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active output. With the amplifier switched on but in 'Standby' the output will be
determined by the frequency of transmission and the programmed Antenna output 1,
2 or 3 for that frequency. As shipped from the factory all bands are set to ANT 1
output.
For the first time we recommend a dummy load be connected to the output whilst
the user gains familiarity with the operation of the BLA600. This with the default
factory setting should be connected to ANT 1 output . A suitable power meter may
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also be connected between the two. The power should be reduced to minimum on
the transceiver, (see your user manual). Switch on the amplifier and wait for the self
test procedure to complete.
After this has taken place the amplifier will be 'Standby' mode. A test transmission
can now be made to ensure that there is no problem with any of the connections.
During this time the amplifier will read the transmit frequency and automatically
change to the correct Low Pass Filter, which will be indicated on the front panel by
illuminating the relevant band indicator . (The correct band filter may also be
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