Alignment Instructions 8 - Realistic trc-449 Service Manual

ALIGNMENT OF RECEIVER SECTION
1. Equipment Required
a. RF Signal Generator (455 kHz and 27 MHz Band, 50 ohm output impedance)
b. AF VTVM
e. DC Power Supply
c. Oscilloscope
f. 8 ohm load
d. RF Voltmeter
2. Procedure (See page 8 )
Connect Test Equipment as shown below.
Note;
L2 is adjusted at the factory so no adjustment should be made.
STEP
SIGNAL GENERATOR
SETUP
PRESET TO ADJUSTMENT
REMARKS
27.185 MHz, modulated
1 kHz (30%)
RX, AM, CH 19
VOL. & RF Gain
Control : Max.
SQUELCH : Min.
ANL &N.B.: Off
L3, L4, L5, L6,
L7, L8
Adjust for a max. output.
2 Same as Step 1
Same as Step 1
VR 5
Adjust for 2 volts output with
a SG output level of 0.5 µV.
3 1 kHz NO MOD
RX, USB, CH 19
VOL. & RF Gain
Control: Max.
SQUELCH :Min.
ANL & NB : Off
CT 1
Adjust for 2 volts output with
a SG output level of0.25 µV.
4
Same as Step 3 Same as Step 3
VR 1
Adjust for a reading of S-9 on
the Transceiver's S-Meter, with
SG output level of 100 p.V.
5
Same as Step 1
Set RF Generator
level to 1 mV
RX, USB, CH 19
VOL. & RF Gain
Control: Max.
SQUELCH
: Max.
ANL & NB : Off
VR 3
Adjust so squelch circuit just
opens with 1 mV signal.
6 Same as Step 1
RX, USB, CH 19
RF Gain Control : Max.
SQUELCH : Min.
ANL & NB : Off
(Volume
Control)
Adjust for 2 volts output with a
SG output level of 0.5µV.
7 Same as Ste 1 p
RX, USB, CH 19
RF Gain Control : Min.
SQUELCH
: Min.
ANL & NB
: Off
VR 2
Adjust for 2 volts output with a
SG output level of 50 µV.
8 23.5 MHz NO MOD
RX, USB, CH 19
RF Gain Control : Max.
SQUELCH : Min.
NB : On
ANL
: Off
L1
Adjust for max. output with
Volt-Meter connected to TP5,
with SG output level of 200µV.
RECEIVER TEST EQUIPMENT SETUP