Created by:
Approved by:
Rev.No:
For Stage:
Release Date:
Page: 9 Of 57
Model No: 3420
Drawing No:
Customer :
Model No:
H 520 PLUS
Rev. Date:
TRANSMITTER SECTION
Test Equipment Required
•
RF power meter (RF SSVM)
•
DC power supply (9.0 volt, 3 amp)
•
50 ohms dummy load (non-inductive)
•
Spectrum analyzer
•
RF attenuator (50 ohms non-inductive)
•
Frequency counter
•
Oscilloscope
•
Coupler
•
Audio generator
ALIGNMENT PROCEDURE
Step
Setting
Connection
Adjuster
Adjust for
1
RF power stage
MIC : Transmit
Volume : optional
Squelch : optional
CH : selector : 19
Connect dummy load and
RF power meter to the
EXT-ANT jack on the set
(Figure 3).
T203
T204
Maximum indication on
the power meter (4
watts). If indication is
not in 4 watts range,
adjust T203, T204.
2
Second harmonic check
MIC : Transmit
Volume : optional
Squelch : optional
CH : selector : 19
Connect RF power meter
With dummy load to
spectrum analyzer through
coupler /-40 dB
Attenuator to EXT-ANT jack
on the set
(Figure 4).
At no modulation,
compare the level o
fundamental frequency
to the level of harmonic
frequency. Suppression
of the 2
nd
harmonic
frequency level must be
3
Frequency check
MIC : Transmit
Volume : optional
Squelch : optional
CH : selector : 19
Connect dummy load and
frequency counter though
coupler to RF power meter.
Connect RF power meter to
EXT-ANT jack on the set
(Figure 5).
X302
Be sure that the
indication of the
transmitter frequency is
27.185MHz
±
300Hz on
the frequency counter.
4
TX power adjustment
Volume : optional
Squelch : optional
CH : selector : 19
Connect dummy load and
oscilloscope through
Coupler to RF power meter
connect audio generator to
microphone jack
(Figure 6).
RV501
Adjust until
3.6-4 Watts