VHF OUTPUT RF METERING & AGC CIRCUIT BOARD
PUB96-33 rev 1: May 16, 1997
33-4
RF Output Metering 20B1299G3
djust
R36
to
cut
back
the
output
of
the
transmitter
until
the
reflected
power
meter
upper
scale
now
ith
the
16
dB
pad
still
in
circuit,
adjust
R42
until
K1
energizes,
and
the
"VSWR
C/B"
indicator
LED
on
ulse.
After
three
pulses
(visible
on
the
meter),
lock
out
and
a
red
"VSWR
L/O"
indication
on
the
ontrol
Panel
should
occur.
Check
that
RESET
is
possible
using
the
RESET
button
S6
on
the
Control
Panel.
A
reads
20
(2.0%).
This
is
about
17
to
18
dB
below
the
full
forward
power
output
of
the
transmitter.
W
the
Control
Panel
lights
up.
Replace
the
16
dB
pad
with
a
10
dB
pad,
and
adjust
R49
slowly
until
U3
‐
7
goes
LOW,
causing
U5
to
p
C