DE
DANIELS
ELECTRONICS
Enhanced AM/FM Synthesizer Instruction Manual OS(R/T)-3(A/H) 29 - 470 MHz
3-1
3
SYNTHESIZER ALIGNMENT
3.1
General
OS(R/T)-3(A/H) enhanced synthesizer alignment is simplified by using a Type 84 subrack and RF
extender card/cable to provide receiver or transmitter power and signal interconnection.
Alternatively, +9.5 Vdc may be applied directly to a receiver or transmitter module through
positive connection to pins B6 / Z6, and negative connection to pins B30 / Z30 / B32 / Z32.
Receiver balanced audio (600
Ω
) is available at pins B26 and Z26.
3.2
Repair Note
The OS(R/T)-3(A/H) synthesizer employs a high percentage of surface mount components which
should not be removed or replaced using an ordinary soldering iron. Removal and replacement of
surface mount components should be performed only with specifically designed surface mount
rework and repair stations complete with Electro Static Dissipative (ESD) protection.
When removing Surface Mount Solder Jumpers, it is recommended to use solder wick braid in
place of vacuum type desoldering tools. This will help prevent damage to the circuit boards.
3.3
Recommended Test Equipment
Alignment of the synthesizer requires the following test equipment or its equivalent.
Power supply - Reg9.5 Vdc at 2 A. Phillips PM 2811
Oscilloscope / Multimeter - Fluke 97 Scopemeter
Radio communications test set - Marconi Instruments 2965A
It is recommended that the radio communications test set be frequency locked to an external
reference (WWVH, GPS, Loran C) so that the internal high stability local oscillator may be
accurately set to within its ±1 ppm frequency tolerance.
3.4
OS(R/T)-3(A/H) Synthesizer Factory Configuration
The OS(R/T)-3(A/H) Synthesizer is factory configured as follows:
•
Internal 9.6 MHz reference selected.
•
VCO modulation by audio processor enabled (OS
T
TX versions only)
