Adjustment Of Apc Circuit; Adjustment Of Alc Circuit; Adjustment Of The Vswr Meter - JRC JRL-2000F Service Manual

4.4.2 Adjustment of APC Circuit
[ Required measuring instruments ]
(1 )High frequency power
met~r
(over 1 kW max.)
(2)Dummy Ioad (over 1 kW max.)
< Adjustment procedures >
(1 }Turn RV3 of CCB-367 PA control anticlockwise until it stops.
(2)Set the outputpower to 1050 W. Adjust RV3 APC to decrease the power a little.
(3)Confirm that a drive LED lights up orange in color when the Ievei of the output
power of the transcsiver is slightly increased.
4.4.3 Adjustment of ALC Circuit
[ Required measuring instruments ]
(1 )High frequency power meter (over 1 kW max.)
(2)Dummy Ioad (over 1 kW max.)
< Adjustment procedures >
(1 )Turn ALC volume switch on the back of the JRL-2000F anticlockwise, viewing from
the front, until it stops.
(2)Adjust the frequency to 21 MHz and power to 1000 W.
(3)Switch the right meter range to ALC and adjust RV1 of CDJ-1143 control circuit.
Turn RV1 until the needle of the meter suddenly moves. Adjust RV1 so that the
needle of the meter exceeds a little further from the white zone.
(4)Turn ALC volume switch on the back of the JRL-2000F anticlockwise, viewing from
the front, so that the needle of the meter moves backward from the white zone. At
this time, the outputpower becomes about 950 W.
(5)Turn ALC volume switch on the back of the JRL-2000F anticlockwise, viewing from
the front, until it stops.
4.4.4 Adjustment of the VSWR Meter
(1 )Switch the meter range to VSWR in receive state and adjust RV5 of CDJ-1143
control circuit so that the needle of the meter points to zero.
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