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500 WATT RADIOBEACON TRANSMITTER
ND2000A-02x-xx0
Page 5-14
15 January 2005
(l) If the changeover delay time in step (k) is
satisfactory, go to step (p); if not, complete steps
(m) through (o).
(m) Set
RF
switch to
OFF
and
MONITOR
switch to
BYPASS
.
(n) Adjust
CHANGEOVER DELAY
potentiometer
A10R48 in the direction required to produce the
desired changeover time delay.
NOTE
CHANGEOVER DELAY
potentiometer A10R48 can be
adjusted for a changeover time delay that is between
20 and 80 seconds. Clockwise adjustment increases
the time and counter clockwise adjustment decreases
the time.
(o) Repeat steps (e) through (n) until the
requirements of step (k) are met without further
adjustment of
CHANGEOVER DELAY
potentiometer A10R48.
(p) Set
RF
switch to
OFF
and
MONITOR
switch to
BYPASS
.
(q) Set
KEYING
switch A4S1 (A5S1) to
ON
.
(r) Set
RF
switch to
ON
.
(s)
SET THRSH
lamp A10DS1 shall be flashing on
and off.
(t) Monitor
SET THRSH
lamp A10DS1 and
decrease carrier level by adjusting
O/P POWER
potentiometer A4A2R48 (A5A2R48) counter
clockwise until
SET THRSH
lamp A10DS1 just
turns full on.
(u)
TEST-Power/Mod
meter's forward power
indication shall be the level recorded for carrier
fault threshold level in
Established References
section of table 5-2.
(v) Simultaneously start stopwatch, monitor
STANDBY ALARM
lamp and set
MONITOR
switch to
NORMAL
.
(w)
MONITOR-BYPASS
lamp A1A1DS8 shall turn
off and selected side
A
or
B
shall remain on.
(x) After the delay determined in step (c), the
selected side (main) transmitter will turn off and
STANDBY-ALARM
lamp shall turn on [(see note
after step (k)].
(y) Set
RF
switch to
OFF
and
MONITOR
switch to
BYPASS
.
(z) Set
RF
switch to
ON
.
(aa) Adjust
O/P POWER
potentiometer A4A2R48
(A5A2R48) for the intended carrier level, as
indicated by
TEST-Power/Mod
meter.
(ab) Verify
KEYING
switch A4S1 (A5S1) is set to
ON
.
(ac)
SET THRSH
lamp A10DS1 shall be flashing on
and off.
(ad) Monitor
SET THRSH
lamp and decrease mod
depth by adjusting
TONE LEVEL
potentiometer
A4A2R19 (A5A2R19) counter clockwise until
SET THRSH
lamp just turns full on.
(ae) Set
KEYING
switch A4S1 (A5S1) to
OFF
.
(af) Set
TEST-Power/Mod
switch to
MOD-SET
.
(ag) Adjust
SET 100 % MOD
potentiometer for a
100% modulation depth indication on
TEST-
Power/Mod
meter.
(ah) Set
TEST-Power/Mod
switch to
MOD-READ
.
NOTE
When reading modulation percentage on
TEST-Power/
Mod
meter, always set
TEST-Power/Mod
switch to
MOD-SET
and adjust
SET 100 %
potentiometer for a
100% indication before taking a modulation depth
reading.
(ai)
TEST-Power/Mod
meter's modulation indication
shall be percentage recorded for mod fault
threshold level in
Established References
section of table 5-2.
(aj) Set
KEYING
switch A4S1 (A5S1) to
ON
.
(ak) Simultaneously start stopwatch, monitor
STANDBY ALARM
lamp and set
MONITOR
switch to
NORMAL
.