Decade TRC-800 - SECTION 4: MAINTENANCE AND ALIGNMENT; Maintenance; Frequency selection; RF power level adjustment

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MAINTENANCE
AND ALIGNMENT
A) Maintenance
No maintenance
is required
to
keep
the transmitter
in
top operating
condition.
lf
an external cleaning appears
neccessary,
use a soft, damp
cloth and
mild
soap only,
Frequency
selection
The
transmitting
frequency is
programmed
at the
factory. lf
a change of
the
frequency was
required, follow
these steps:
1
)
f rom
the
<bits
switch> codes table, on the
next
pages,
select
the
appropriate
<bits
switch> code for
your
chosen frequency
and set
the
<bits
switch,, on the
main
board accordingly.
Refer
to
the
,,adjustments
diagrams> at the end of the
manual for
the
location
of
the
<bits
switch>.
Connect a
DC voltmeter
to the alligator
clips,
with
the
positive
terminal
(+,
red)
of the
voltmeter
on the
red
alligator clip
and the
negative
terminal
(-,
black) of the
voltmeter
on
the black alligator
clip.
Select the
20 VDC
scale on
the
voltmeter.
Using
a small,
non-conductive
flat
screw-driver, turn the COARSE
tuning adjustment of the
VCO
until
you
read
between 0.5 and
7.5
volts, Then
turn
the
FINE
tuning adjustment until
you get
a reading
between 3.0 and 5.0 volts. Your
transmitter is
now
stabilised on
the selected
frequency.
RF
power
level
adjustment
A
small white
trimpot
labeled POWER
(PWR)
and
located near
the
<bits
switch> is
used to control the
RF
power
level
of the transmitter.
Turn
clockwise
to
increase RF
power
level
and counterclockwise
to
decrease
rt,
B)
2)
3)
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