Crystal Oven; Low-Pass Filters - Codan NGT 2010 RF Technical & Service Manual

NGT—Checks and adjustments

Crystal oven

Drawings 08-05235,
ALTERNATIVE TEXT
The crystal oven (drawings
08-05261 (sheet
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).
Drawings 08-05963,
ALTERNATIVE TEXT
NOTE
The Crystal Oven Assembly (drawing 08-05963) is used on the RF/IF PCB (drawing
08-05889 (sheet
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

Drawing
ALTERNATIVE TEXT
NOTE
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.
152
04-03095 and
08-05235
1)) is attached to the reference crystal Z1.
04-03410 and
If the PCB issue status is -06 or earlier, see drawing
1)) and contains the reference crystal Z1.
08-05261 (sheet 2) or
If the PCB issue status is -06 or earlier, see drawing
08-05261 (sheet 1)
and 04-03095) on the RF/IF PCB (drawing
08-05889 (sheet 1)
08-05889 (sheet 2)
NGT Transceiver System Technical Service Manual
08-05889 (sheet 1).
08-05889 (sheet 2).