B3.8 T855 Initial Tuning and Adjustment M8SL2-00-002-812
© Copyright Tait Electronics Limited August 2004. All rights reserved.
3.4.7 RSSI (If Fitted)
The T800-04-0000 RSSI is an optional PCB which adds signal strength monitoring and
high level mute facilities to the basic receiver.
Ensure the T800-04-0000 PCB is fitted in SK320 and SK330 in the IF compartment.
Apply an on-channel signal from the RF generator at a level of –110dBm with
±3kHz deviation (±2.4kHz) [±1.5kHz] at 1kHz.
Adjust RV320 (RSSI level) to give 2.0V RSSI output on pin 5 of D-range 1 (PL100)
when measured with a high impedance DMM.
3.5 Audio Processor Links
3.5.1 General
Use the following table to set up the audio processor to the configuration you require.
You should set the audio processor links before carrying out the receiver alignment. The
factory settings are shown in brackets [ ].
Plug Link
a
a. The letters in this column and in the table in Section 3.5.2 below refer to the identification
letters screen printed onto the PCB beside each set of pins.
Function
PL210
[1 – 2]
2 – 3
[A – B]
B – C
de-emphasised response
flat response
PL220
1 – 2
[2 – 3]
D – E
[E – F]
flat response
de-emphasised response
PL230
b
b. Refer to Section 3.5.2 for further details.
1 – 2
[2 – 3]
3 – 4
M – N
[N – P]
P – Q
audio input via AUDIO-2 pad
audio from internal CTCSS speech filter
audio input via I/O pad P250
PL240
b
1 – 2
[2 – 3]
or
3 – 4
4 – 5
G – H
[H – J]
or
J – K
K – L
bypass high pass filter
300Hz high pass filter in circuit
audio input via PL230 or I/O pad
PL250
[1 – 2]
2 – 3
[R – S]
S – T
noise mute
carrier mute
PL260
1 – 2
[2 – 3]
U – V
[V – W]
RX-DISABLE link
not connected
PL270
[1 – 2]
2 – 3
[X – Y]
Y – Z
relay link
not connected
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