Realistic HTX-100 Service Manual page 15

ALIGNMENT OF RECEIVER PORTION
1. Test Equipment Required
AF SSVM
Oscilloscope
Standard Signal Generator (29.000 MHz,
and 50 ohm Impedance)
DC Power Supply (13.8 V)
Dummy Load (8 ohm)
Noise Generator
2. Preparation for Alignment
NB SW OFF
Min.
MAX
MODESW
RF Gain
TX/RXSW
SSB
MAX
RX
Squelch
VOLUME
RIT
Middle position
3. Alignment Procedure
Step
Preset to Adjustment
1
L2rvL5
L 7 and L 8
2
Squelch: Fully
VR2
clockwise
3
VR 1
4 NB:ON L 1
TEST EQUIPMENT CONNECTION
.,a
Signal
00
Generator
D
Oscillo-
scope
Remarks
Alignment for sensitivity
Adjust coils for maximum reading on the AF SSVM.
(During this step, set the Standard Signal Generator attenuator
so that the standard output is less than 0.5 W (2 V/8 ohm).)
Alignment for Squelch
Set the output of Standard Signal Generator to 1 mV and
squelch to maximum.
Adjust VR 2 so that the squelch just breaks.
Alignment for S-Meter
Set the output of Standard Signal Generator to 100 f.J.V, no
modulation.
Adjust VR 1 so that "9" LED just lights on.
Set the level of S.S.G. to approx. 2p,V, then adjust L 1 for maxi-
mum reading on the oscilloscope.
Connect the oscilloscope to TP 1 .
Transceiver
~----,
EJ
~
EXT
SPKR
1~11--1'1
DC Power Supply
13 .8V
-14-
- - - , AF Oscillo-
1 I SSVM
1
1 scope
I
I
...__---t-1--'
I I
f '
1 I
I 1 I I
1
L ___ J
L ___
_J
L-
L--------------
a.n.
Load