User's Manual

3-6
3.7.9 Data Input
Data communications equipment requiring direct access to the modulator and discriminator
an be connected via pins 2 and 11. Data cannot be transmitted in CANADA unless
equipment is approved for use with the TFM-500 by the communications regulatory
authority.
3.8 INTERNAL PROGRAMMING AND GUARD ENABLE/DISABLE JUMPER
The programming and direct frequency entry modes can be disabled by removing the
internal enable/disable jumper strap from pins 1 and 2 of J10. Removal of this jumper will
prevent operation on any frequencies other than those programmed in the 400 memory
positions and two guard receiver memory positions. Removal of the guard receiver
programming enable /disable jumper strap from pins 1 and 2 of J11 will totally disable the
operator’s ability to re-program the 2 guard receiver channels.
The transceiver is always shipped with the two jumpers in the entry enable positions. To
place either of the jumpers in the disable position:
1. Remove the left side of the radio.
2. Set or remove jumpers as necessary.
3. Re-assemble the radio in the reverse order.
Microprocessor Control Unit (MCU) PCB Module:
FIGURE 3-3 Internal Enable/Disable Jumper Locations