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NGT—Checks and adjustments
NGT Transceiver System Technical Service Manual
177
To adjust the driver bias:
1
Ensure the transceiver is switched off and the DC supply is disconnected.
1
Disconnect the exciter output from the PA by removing the connector from J2 (Tx
coaxial) on the RF/IF PCB in the RF unit (drawing
1
Unsolder the link labelled DR (DC supply to the driver transistors V207 and V208)
(see
1
Set a multimeter to DC 20 mA range and connect it in place of the removed link.
1
Connect the DC supply, then switch on the transceiver.
1
Select any transmit channel, then
hold down
PTT.
1
Check that the driver current measures 13 mA
±
2 mA.
1
If the current is out of the specified limit stated above, change it by adjusting DR
BIAS (R222) (see
1
Release PTT.
1
Switch off the transceiver, disconnect the multimeter, then replace the link with a
length of tinned copper wire.
To adjust the driver bias:
1
Ensure the transceiver is switched off and the DC supply is disconnected.
1
Disconnect the exciter output from the PA by removing the connector from J2 (Tx
coaxial) on the RF/IF PCB in the RF unit (drawing
).
1
Unsolder the link labelled DR (DC supply to the driver FETs V207 and V208) (see
).
1
Set a multimeter to DC 200 mA range and connect it in place of the removed link.
1
Connect the DC supply, then switch on the transceiver.
1
Select any transmit channel, then
hold down
PTT.
1
Check that the driver current measures 40 mA
±
2 mA.
ALTERNATIVE TEXT
Drawing
NOTE
The transceiver must be in Service mode to make this adjustment (see
).
ALTERNATIVE TEXT
Drawing
NOTE
The transceiver must be in Service mode to make this adjustment (see
).
Содержание NGT 2010 RF
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