TKR-750 service manual
TKR-750 service manual
TKR-750 service manual
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INSTALLATION<br />
<strong>TKR</strong>-<strong>750</strong><br />
1. External Power Supply Connection<br />
(Rear Connectors) : See Page 3<br />
This unit has two external power supply connectors :<br />
Main DC and Backup.<br />
If an external DC power supply is connected to the main<br />
DC connector and a backup battery is connected to the<br />
Backup connector at the same time, the DC power supply<br />
switches to the battery automatically if power failure occurs.<br />
Therefore, the operation of the repeater can be continued.<br />
If the battery is used, but both the battery and power supply<br />
need not be connected (if an external switch is used or if<br />
only a solar battery is used), connect it to the Backup connector,<br />
not the Main DC connector. Current consumption<br />
can be reduced by approx. 120mA because the relay is not<br />
used.<br />
If it is installed when the temperature at the repeater site<br />
is below freezing, check whether the switch (relay) works<br />
properly after installation.<br />
R653<br />
TX-RX unit (B/2) control section<br />
Component side<br />
CN601<br />
1<br />
14<br />
CN604<br />
CN605<br />
R742<br />
CN606<br />
2. Voice Scrambler<br />
It operates only during base operation. The voice is not<br />
scrambled when it is repeated.<br />
Fig. 1<br />
2-1. Modification<br />
1) Remove R742 and R653 on the TX-RX unit (B/2) : control<br />
section.<br />
2-2. Connection<br />
1) The functions of pins of CN601 on the TX-RX unit (B/2) :<br />
control section are shown in the figure.<br />
2) Join the CN601 connector to the voice scrambler board<br />
via the E37-0808-05 connector cable.<br />
When the operation is checked in PC test mode after the<br />
modification, and the maximum deviation is adjusted, the<br />
voice from the local microphone is not modulated. In this<br />
case, remove the CN601 12-pin (PTO) cable and connect it<br />
to the land of the display unit (X54-333) from the voice<br />
scrambler. The voice from the local microphone can be<br />
modulated in PC test mode.<br />
CN601<br />
1<br />
TXI (MIC signal input)<br />
TXO (MIC signal output)<br />
RXI (RX audio signal input)<br />
AC (Audio control signal output)<br />
BC1 (Scramble code output 1)<br />
BC2 (Scramble code output 2)<br />
BC3 (Scramble code output 3)<br />
BC4 (Scramble code output 4)<br />
PTI (PTT signal input)<br />
CLRC (Clear code for scrambler)<br />
DEO (Detection signal output)<br />
PTO (PTT signal output)<br />
5C (5V output)<br />
GND<br />
14<br />
Voice<br />
scrambler<br />
Display<br />
unit<br />
Fig. 2<br />
Display unit<br />
Foil side<br />
PTO<br />
Fig. 3<br />
13
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