TTI TCB-880 - Receiver Section Alignment

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 Audio Output Adj.
Channel & Frequency :
19CH, 27.185MHz
MIC : Receive
Function : AM Mode
CB/ANL Off/DX
Volume : Full clockwise
Squelch : Turn to counter
clockwise
RF Gain : Full clockwise
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
Maximum
indication on
AC Level
Meter. Reduce
output from
SSG until the
audio output
becomes about
2V.
2
FM Audio Output Adj.
Channel & Frequency :
19CH, 27.185MHz
MIC : Receive
Function : FM Mode
CB/ANL Off/DX
Volume : Full clockwise
Squelch : Turn to counter
clockwise
RF Gain : Full clockwise
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 Maximum
indication on
AC Level
Meter. Reduce
output from
SSG until the
audio output
becomes about
2V.
3
Squelch Adj.
Channel & Frequency :
19CH, 27.185MHz
MIC : Receive
Function : FM Mode
CB/ANL Off/DX
SSG : 27.185MHz, 1KHz,
100uV, 1.5KHz Dev.
Volume : Full clockwise
Squelch : Full clockwise
clockwise
RF Gain : Full clockwise
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.