Receiver Test Equipment Setup - Realistic TRC-449 Service Manual

ALIGNMENT OF RECEIVER SECTION
1. Equ ipment Requ ired
a. R F 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 )
Note;
Connect Test Equipment as shown below.
L2 is adjusted at the factory so no adjustment should be made.
STEP
SIGNAL GENERATOR
PRESET TO
ADJUSTMENT
SETUP
RX, AM, CH 19
27.185 MHz, modulated
VOL.
&
R F Gain
L3, L4, L5, L6,
1
1 kHz (30%)
Control
: Max.
L7, L8
SQUELCH: Min.
ANL & N.B.: Off
2 Same as Step 1
Same as Step 1
VR 5
RX, USB, CH 19
VOL. & RF Gain
3 1 kHz NO MOD
Control: Max. CT 1
SQUELCH : Min.
ANL & NB : Off
4 Same as Step 3
Same as Step 3 VR 1
RX, USB, CH 19
Same as Step 1
VOL.
&
RF Gain
5
Set R F Generator
Control: Max. VR 3
level to 1 mV SQUELCH : Max.
ANL
&
NB
: Off
RX, USB, CH 19
6 Same as Step 1
RF Gain Control : Max. (Volume
SQUELCH : Min. Control)
ANL
&
NB : Off
RX, USB, CH 19
7 Same as Step 1
R F Gain Control : Min.
VR 2
SQUELCH : Min.
ANL
&
NB
: Off
RX, USB, CH 19
RF Gain Control : Max.
8 23.5 MHz NO MOD SQUELCH : Min.
L1
NB : On
ANL : Off
RECEIVER TEST EQUIPMENT SETUP
-16 -
EJ
AF
VTVM
~
Oscillo-
scope
REMARKS
Adjust for a max. output.
Adjust for 2 volts output with
a SG output level of 0.5 /lV.
Adjust for 2 volts output with
a SG output level of 0.25 /lV.
Adjust for a reading of 5-9 on
the Transceiver's S-Meter, with
SG output level of 100 /lV.
Adjust so squelch circuit just
opens with 1 m V signal.
Adjust for 2 volts output with a
SG output level of 0.5 /lV.
Adjust for 2 volts output with a
SG output level of 50/lV.
Adjust for max. output with
Volt-Meter connected to TP5,
with SG output level of 2001lV.
lin
Resistor