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500 WATT RADIOBEACON TRANSMITTER
ND2000A-02x-xx0
Page 5-26
15 January 2005
(a) Verify the requirements of paragraphs 5.5.2
through 5.5.4 have been completed and the
transmitter's unmodulated RF output is the
intended carrier level.
(b) Set switches as tabulated for
Test Setting
in
table 4-1.
(c) Set
TEST-Power/Mod
switch to
MOD-SET
and
TX
switch to
ON
.
(d) Set
MOD
switch A4S2 (A5S2) to
ON
.
(e) Set
TEST-Power/Mod
switch to
MOD-SET
.
(f) Adjust
SET 100 % MOD
potentiometer for 100%
indication on the lower scale of
TEST-Power/
Mod
meter.
(g) Set
TEST-Power/Mod
switch to
MOD-READ
.
Discontinue adjusting
TONE LEVEL
potentiometer
A4A2R19 (A5A2R19) in an increasing mod depth
direction, if
RF CURRENT-ALARM
lamp turns on
before the desired mod depth is obtained. If an
attempt is made to increase the mod depth beyond
this percentage, RF stress current threshold levels
may be exceeded.
(h) Adjust
TONE LEVEL
potentiometer A4A2R19
(A5A2R19) for the 'intended modulation depth'
as indicated on
TEST-Power/Mod
meter's lower
scale.
(i) Set
TEST-Power/Mod
switch to
REFL PWR
.
(j) Reflected power indication on
TEST-Power/Mod
meter shall be less than 50 watts.
(k)
SWR-ALARM
lamp shall remain off.
POST OPERATIONAL ADJUSTMENT
PROCEDURES
5.6
When the operational adjustment
procedures have been successfully completed, set all
switches to the setting tabulated for
Operating Setting
in table 4-1.