Cobra 148GTL-DX, Instruction Manual

Page: 37 / 85

C148GLT DX A U G M E N T PROCEDURE
A U G M E N T OF RECEIVER PORTION
1. Test Equipment Required
a) SG, 27NHz Band.
b) Osci
lloscop>e.
c) AF VTVM (Across 8oz. speaker).
d) Deviation Meter.
2. Alignment Procedure
STEP PRESET ТО ADJUSTMENT REMARKS
1 CH : 19
Band : Mid
AM Mode
Tone : HI
NB/ANL : OFF
AF VR : CW
RF Gain: CW
Coarse : Center
SQ VR : CCW
CH 9 SW: OFF
Set the VR settings as noted in left.
2
Same as Step 1
L4
T u m the Core of L4 to the bottom.
3 Same as Step 1 L3, L5, L6
L7, L8, L17,
L18 and L 4 .
Adjust for maximum reading and readjust
L4 for maximum reading.
4 Same as Step 1
except:
NB/ANL : ON
LI and L2
Set the SG on Mid, Œ18, 27.175MHz (unit
is CH19) with no modulation. Connect Osci­
lloscope to lead of D2 and adjust coils
for maximum reading. Then set the level
of SG to 5uV, then readjust this step
(D2 is TP1).
5 Same as Step 1
except:
SQ VR: CW
VR2
Set the SG to Mid, CH19, 27.185MHz, 30%
AM modulation with lOOOuV. Then t u m the
VR2, so that the AF signal will appear on
Oscilloscope (Tight squelch Adj.).
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