5-3
Receiver Section
5-3-1 Test Equipment Required
•
Standard Signal Generator(SSG)
•
DC power supply(13.8V/3A)
•
AC Level Meter
•
Distortion Meter
•
Oscilloscope
•
SINAD Meter
•
8 ohm Dummy Load
5-3-2 Alignment
Procedure
Step Setting
Connection
Adjuster
Adjust
for
1
AM Sensitivity Adj.
Channel & Frequency :
19CH, 27.185MHz
MIC : Receive
Function : AM Mode
CB/ANL Off/DX
SSG : 27.185MHz, 1KHz,
-67dBm, 30% Mod.
Volume : Optional
Squelch : Minimum
RF Gain : Maximum
Connect RF Signal Generator
to EXT-ANT Connector.
Connect AC Level Meter and
Distortion Meter and SINAD
Meter across EXT SPK jack
with 8 ohm Dummy
Load(Figure 4)
L101
L103
L104
L105
L107
L108
L112
Audio
Maximum,
Distortion
Minimum.
Reduce output
from SSG
until the audio
output
becomes about
10dB S/N
2
FM Sensitivity Adj.
Channel & Frequency :
19CH, 27.185MHz
MIC : Receive
Function : FM Mode
CB/ANL Off/DX
SSG : 27.185MHz, 1KHz,
-67dBm, 1.5KHz Dev.
Volume : Optional
Squelch : Minimum
RF Gain : Maximum
Connect RF Signal Generator
to EXT-ANT Connector.
Connect AC Level Meter and
Distortion Meter and SINAD
Meter across EXT SPK jack
with 8 ohm Dummy
Load(Figure 4)
L109 Audio
Maximum,
Distortion
Minimum.
Reduce output
from SSG
until the audio
output
becomes about
20dB SINAD
3
Squelch Adj.
Channel & Frequency :
19CH, 27.185MHz
MIC : Receive
Function : FM Mode
CB/ANL Off/DX
SSG : 27.185MHz, 1KHz,
-67dBm, 1.5KHz Dev.
Volume : Optional
Squelch : Maximum
RF Gain : Maximum
Connect RF Signal Generator
to EXT-ANT Connector.
Connect AC Level Meter and
Distortion Meter and SINAD
Meter across EXT SPK jack
with 8 ohm Dummy
Load(Figure 5)
RV131 Adjust
until
the audio
output
appears.
Summary of Contents for Freequency TCB-770
Page 31: ...5 1 Main PCB Top side SECTION5 BOARD LAYOUT ...
Page 32: ...Main PCB Bottom side ...
Page 33: ...5 2 Front PCB Top side ...
Page 34: ...Front PCB Bottom side ...
Page 35: ...5 3 LED PCB Top side ...
Page 36: ...LED PCB Bottom side ...
Page 37: ...5 4 Volume PCB ...
Page 38: ...5 5 MIC PCB ...
Page 39: ...SECTION6 BLOCK DIAGRAM ...
Page 40: ...SECTION7 SCHEMATIC ...