home *** CD-ROM | disk | FTP | other *** search
-
-
- Modifying the TM-531E for 9600 baud
- ===================================
-
- 1. Audio output from the receiver is brought out without de-emphasis to pin
- 6 of the microphone socket.
-
- 2. Audio input to the Tx PLL can be inserted at the connector to the CTSS
- tone unit.
- Remove the two screws securing the top cover, remove top cover and set
- aside.
- With the front panel of the radio towards you, lift out the speaker and
- set it aside to the left of the radio.
- The CTSS PCB and connector required is just visible underneath and to the
- left of the speaker mounting cradle.
- Cut the white and black wires from the end of the connector nearest the
- front panel. The black wire is ground, the white feeds via C112/R65 on
- PCB X57-3340-00 A/2 to the output of the mic. amplifier which then goes on
- to the PLL IC via the deviation control, R3.
-
- Note:
- It is possible to input audio direct to connector W301 on PCB X57-3340-00
- B/2, but this PCB is behind the front panel, which requires (preferably)
- a special tool to remove the mic. socket locking ring. The black and white
- wires do go direct to this connector, so there is little point in making
- more work than is absolutely necessary.
-
- 3. The audio cable can be taken out via a slot in the side of the rear
- heatsink below the 13v8 input cable grommet.
-
- Information source: Importer's mod. sheet.
-
-