Uniden Benjamin, Service Manual

Page: 18 / 77

E. ALIGNMENT PROCEDURE OF RECEIVER
Conditions
Supply voltage (АС) : 220V 60Hz
Channel : 19 CH
Output Impédance : 8 О
Standard Output : 500 mW
Ant. Impédance : 50 OHMs
SSG Freq. : 27.185 MHz
(19 CH)
SSG Mod. Signal : 1.000 Hz 30% MOD.
: 1.5 KHz DEV. FM
Probe Earlh : TP10. (FM TP 13)
Unless otherwise specified, switches, volumes and etc. shall be set as
follows :
NB/ANL SW : OFF RF Gain
: MAX
Clarifier
: Center Squelch : MIN
Volume : MAX HI Cut SW : OFF
The dB values below are ail direct readings from SSG attenuator
STEP MODE
POINTS ТО
BE AD.T.
ADJUSTMENT PROCEDURE
1 RX
AM 19 CH
L. 5 Sink the core up to the deepest part
2 RX
AM 19 CH
L3, 4, 6, 7, 8,
10, 11
Adjust each coil to peak. However,
suitably reduce the SSG Att. so that
the standard output will not be
exceeded at all tiraes.
3
RX AM
1 СН/ 40 CH
L 5 Adjust to peak at CHI. Next, alter-
nately switch CHI & CH40 and adjust
so that sensitivity déviation is
within 1 dB.
4 RX USB
20 CH
ANL/NB SW ON
L. 2 Connect oscilloscope to TPI (R15 lid)
& sink the core up to the deepest part
of L2. Then adjust coil to Ist DC peak
level as seen from the oscilloscope.
SSG Att. shall be set at 20 dB. After
adjustment, turn OFF ANL/NB SW.
5
RX
AM 19 CH
VR 2
Adjust so that squelch opens at SSG
output of 66dB ± 2dB.
6 RX
AM 19 CH
VR 1
Set SSG output to N0 MOD 46 dB. Adjust
to signal "9" the meter indication of
the unit
7
RX
FM 19 CH
L602
Connect RF oscilloscope to TP12 (R633)
Adjust to MAX the oscilloscope RF
level.
8
SAME
AS 7
L601
SSG output to 1.5 KHz Dev. MOD 66dB.
Adjust to MAX WAVE at the nearly stan­
dard output.
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