NGT—Checks and adjustments
NGT Transceiver System Technical Service Manual
169
Aligning the 455 kHz IF and noise limiter
There are two tuned transformers in the 455 kHz IF circuit located on the RF/IF PCB in
the RF unit. T202 is located in the IF path to the sideband filter. T201 is located at the
output of the noise limiter 455 kHz amplifier.
To align the transformers in the 455 kHz IF circuit on the RF/IF PCB:
1
Select any normal receive channel.
1
Connect a signal generator to the receiver input.
1
Set the signal generator to 1 kHz above the channel frequency selected (or 1 kHz
below for LSB) at an output of approximately –30 dBm (10 mV).
1
Fit a link across ON to disable the noise limiter gate (see
or
).
1
Connect an oscilloscope to TP201 using a 10× probe.
1
Set the input to 50 mV per division (0.5 V per division with the 10× probe).
1
Set the timebase of the oscilloscope to 50
µ
s per division.
1
Set the oscilloscope for an auto trigger.
1
Adjust T202 for maximum amplitude.
Only a small change in amplitude is seen due to the low Q of the tuned circuit.
1
Remove the 10× probe from TP201.
1
Connect a 1× probe to position A (part of the noise limiter links) (see
and drawing
).
1
Set the oscilloscope to a sensitivity of 10 mV per division.
1
Adjust T201 for maximum amplitude.
1
Remove the link across ON and return it to its parking position (centre).
ALTERNATIVE TEXT
Drawing
NOTE
If the PCB issue status is -06 or earlier, see drawing
NOTE
The transceiver must be in Service mode to perform this check (see
).
Содержание NGT 2010 RF
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