IM10-OS3AH
406-470 MHz - Synthesizer Alignment
68
OS(R/T)-3H SYNTHESIZER
FACTORY CONFIGURATION
The OS(R/T)-3H Synthesizer is factory
confi gured as follows:
Internal 9.6 or 10.0MHz reference selected.
VCO modulation (via audio processor)
enabled (OST TX versions only)
enabled (OST TX versions only)
The corresponding synthesizer
jumper settings are:
Digital Board
Jumper JU2 installed
10.0MHz reference
frequency selected (default)
frequency selected (default)
Jumper JU2 not installed
9.6MHz reference
frequency selected (default)
frequency selected (default)
Jumper JU1 not installed
AM Multichannel mode
selected (default)
selected (default)
Analog Board
Jumper JU1: ‘B’ position
Internal TCXO
reference freq. selected (default)
reference freq. selected (default)
OS(R/T)-3H SYNTHESIZER
ALIGNMENT PROCEDURE
General
Synthesizer alignment is normally accomplished
with the synthesizer installed in the MT-3
Receiver IF/Audio Board or the MT-3 Transmitter
Main Board. The alignment procedure involves
setting the internal TCXO reference frequency,
the internal reference option is enabled. This
step is described in ‘Reference Frequency
Alignment’ in this section. A change in operating
frequency from the initial factory setting that
exceeds the synthesizer’s maximum tuning
range (Refer to Specifi cations) requires a more
involved alignment procedure as described
below. The conversion of a synthesizer
from an internal reference to an external
reference or vice-versa is accomplished
through the selection of jumper JU1 A (for
external) or B (for internal, on the analog
board), and as appropriate JU2 on the digital
board (Refer to ‘Jumper Confi guration’).
Synthesizer Test Points
Analog Board Component Layout (Top)
TP1
+8.0 ±0.3VDC
U6 positive regulator output
U6 positive regulator output
TP2
+5.0 ±0.1VDC
U7 positive regulator output
U7 positive regulator output
TP3
+5.0 ±0.1VDC
U8 positive regulator output (always on)
U8 positive regulator output (always on)
TP4
PLL error voltage.
UHF versions employ an integrated
VCO module and require no adjustment.
VCO module and require no adjustment.
Digital Board Component Layout (Bottom)
TP1
+5.0 ±0.1VDC.
U2 positive regulator output
(controlled via pin P2-4)
(controlled via pin P2-4)
TP2
Microcontroller E clock.
2MHz logic level square wave
2MHz logic level square wave
Summary of Contents for OSR-3H061
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