CAUTION – READ THE MANUAL CAREFULLY BEFORE OPERATING
YOUR 87A.
The ALPHA 87A is extremely easy to install and operate, but failure to carry out
each procedure exactly as described in the manual is likely to lead to amplifier damage which
is not covered under warranty. Damage to other station equipment also may result.
Before Operating Your Alpha 87A
1. You must set transceiver power output properly.
The Alpha 87A requires about 50 watts drive for
full rated output.
Damage caused by
overdriving the ALPHA 87A will not be
covered under warranty
. Fortunately, most
modern transceivers maintain quite consistent
output from band to band and mode-to-mode if
set up properly. We recommend that you only
run the Alpha 87A in high voltage mode, running
your amp in low voltage mode with high plate
current can damage components.
Setting the transceiver POWER or RF PWR
control IS NOT SUFFICIENT.
Several popular
transceivers can generate RF spikes of 200-
300W or more unless the transceiver internal
ALC (drive level) is also adjusted carefully
according to its manufacturer’s instructions. This
typically is done with a knob labeled DRIVE (IC-
781, FT-1000), PROCESSOR OUT (TS-940, TS-
950) or, on SSB when speech processing is not
in use, MIC or MIKE.
2.
The ALPHA 87A “faults” into STBY or OFF
when unsafe operating conditions occur.
If
this happens, record which SEGMENT LEDs are
flashing to indicate a BCD fault number, and refer
to manual section 8.0.
3.
On any frequency where your antenna
VSWR exceeds 1.5:1
, it’s important to
manually program the ALPHA 87A for a
proper match. See manual sections 7.2-
7.4. Efficiency, linearity, and output often
can be improved even when VSWR is
less than 1.5:1. The 87A does not
contain an antenna tuner. The SWR will
need to be tuned via the antenna or an
external tuner connected to the output of
the Alpha 87A.
TO SAVE THE DATA TO MEMORY
after manually tuning your ALPHA 87A in
any given segment, first press ENTER;
then, while the ENTER LED is flashing,
press the desired SEGMENT button.
4. To operate the ALPHA 87A efficiently
and cleanly at power output much
different from 1.5kW it must be manually
tuned and loaded (i.e. programmed)
accordingly or AlphaMax must be turned
on. See Section 7.
Page
7
Alpha
87A
User
Manual
Rev
2.0
Содержание 87A
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