Tait TM8100 mobiles Service Manual page 472

Table 17.3 Line-interface settings in the Programmable I/O form, Audio tab
Rx/PTT Type Tap In
Rx None
EPTT1 T5
Table 17.4 Line-interface settings in the PTT form, External PTT (1) tab
Field
Advanced PTT
17.2.4 Adjusting RV1, RV2 and RV3
Setting the Keying
Time Delay (RV1)
472 TMAA01-01 Line-Interface Board
Tap In Type Tap In Unmute
A-Bypass In On PTT
A-Bypass In On PTT
PTT Transmission Type
Audio Source
2. Set the DIP switches on the line-interface board (S1) to the following
default test settings:
DIP1 on (two-wire audio interface)
■
DIP2 off
■
DIP3 off
■
DIP4 on (busy/gate = rx-gate)
■
DIP5 on (busy/gate logic active high)
■
DIP6 off
■
DIP7 off (two-wire keying)
■
DIP8 off (time delay disabled).
■
3. Disassemble the radio in order to gain access to the options cavity. For
detailed disassembly instructions, refer to
Reassembly" on page
Note
When installing the internal options loom, take care that it is
folded in the way shown in
4. Connect the internal options loom between SK2 on the line-
interface board and SK102 on the radio's main PCB.
5. Set up the test equipment shown in
adjustment procedure for R V1, R V2 and R V3 described in the following
section.
The keying time delay circuit is used to prevent the burst of noise occurring
before a mobile is able to mute the audio when the carrier signal disappears.
The keying time delay is used in conjuction with the keying signal
(SK1 pin 1).
Set DIP8 on, and adjust RV1 for the required time delay. Rotate RV1
clockwise to increase the delay, and counterclockwise to reduce the delay.
Note
If the W1 link is fitted, the maximum time delay available is
reduced from 5 seconds to approximately 2.5 seconds.
Tap Out Tap Out Type Tap Out Unmute
R7 D - Split
None C-Bypass 0
Setting
Voice
Audio Tap In
"Disassembly and
135.
Figure 17.2.
Figure 17.1, and follow the
TM8100/TM8200 Service Manual
© Tait Electronics Limited November 2007
Busy Detect
On PTT