NGT—Checks and adjustments
152 NGT Transceiver System Technical Service Manual
Crystal oven
The crystal oven (drawings 08-05235 and 04-03095) on the RF/IF PCB (drawing
08-05261 (sheet 1)) is attached to the reference crystal Z1.
The oven should be checked after a warm-up period of five minutes.
The operating temperature of the oven should be 70°C ±5°C (158°F ± 41°F).
The Crystal Oven Assembly (drawing 08-05963) is used on the RF/IF PCB (drawing
08-05889 (sheet 1)) and contains the reference crystal Z1.
The oven should be checked after a warm-up period of five minutes.
The operating temperature of the oven should be 70°C ±5°C (158°F ± 41°F).
Low-pass filters
There are two 30 MHz LPFs. Both are located on the RF/IF PCB in the RF unit. One is
located in the receiver input and the other is located in the exciter output.
Alignment of the LPFs is not necessary. Each coil (L106 and L114) is pre-aligned to a
frequency of 45 MHz.
ALTERNATIVE TEXT
Drawings 08-05235, 04-03095 and 08-05261 (sheet 1)
ALTERNATIVE TEXT
Drawings 08-05963, 04-03410 and 08-05889 (sheet 1)
NOTE If the PCB issue status is -06 or earlier, see drawing 08-05889 (sheet 1).
ALTERNATIVE TEXT
Drawing 08-05261 (sheet 2) or 08-05889 (sheet 2)
NOTE If the PCB issue status is -06 or earlier, see drawing 08-05889 (sheet 2).
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