TTI TCB-550 - Page 18

Step Test Item UUT setting Equipment setting
Alignment
point
Spec.
2
RX sensitivity Same as step ”1”
SSG setting:
1) RF level: -107dBm
2) Others: same as step ”1”
<-107dBM
at 10dB SINAD
(if not,align again)
3
FM
Audio output
Adjustment
Channel: CH19
Function:
1) FM mode 2) CB
Unit: RX condition
Volume: Optional
Squelch: Minimum
Others: Don’t care
Connect the equipment and
UUT as shown on Figure.5
SSG setting:
1) Freq.: 27.185MHz
2) AF: 1KHz
3) RF level: -47dBm
4) Modulation: 1.5KHz
LR5
Audio Level:
>5V at maximum
unit’s volume.
Distortion:
<5% at 2V audio
level (need unit’s
volume adj. to get
2V audio level)
4
RX sensitivity Same as step ”3” SSG setting:
1) RF level: -107dBm
2) Others: same as step ”3”
<-107dBm
at 20dB S/N
(if not,align again)
5
TIGHT
Squelch
Adjustment
Connect the equipment and
UUT as shown on Figure.5
SSG setting:
1) Freq.: 27.185MHz
2) AF: 1KHz
3) RF level: -47dBm
4) Modulation: 1.5KHz
Channel: CH19
Function:
1) FM mode
2) CB
Unit: RX condition
Volume: Don’t care
Squelch: Maximum
Others: Don’t care
RVQ1
Adjust until
audio signal
is appeared
on the scope.
Adjustment:
1. adjust RVQ1
Connect the equipment and
6
AUTO
Squelch
Adjustment
Channel: CH19
as shown on Figure.5
Function:
1) FM mode
2) CB
SSG setting:
1) Freq.: 27.185MHz
Adjust until
2) AF: 1KHz
Unit: RX condition
audio signal
RVQ2
3) RF level: -107dBm
Volume: Don’t care
is appeared
4) Modulation: 1.5KHz
Squelch VR: OFF
on the scope.
Others: Don’t care
Adjustment:
1. adjust the RVQ2
Figure 5