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The manual states that those are used to change the radio control port outputs from RS-232 to TTL as follows: Most radios available today with serial computer control ports have TTL-level (0-5v) inputs and outputs. The radio's manufacturer then provides a fairly expensive accessory that is used to convert the TTL-level voltages to RS232-level voltages (-12 to +12). The LLG02 board, when purchased with the serial KC Tuner option, has an option on the serial output voltage levels. The board comes to you from us populated with RS232 level-converter ICs. We also provide two header plugs (IC-shaped component carriers) with two jumpers on each plug.
If your radio has TTL-level outputs, you can replace the level-converter ICs with the supplied header plugs and connect the KC Tuner directly to your radios, eliminating the need for the manufacturer's level converters. Note that these header plugs convert both port A and B to TTL levels - you can not have one port at TTL levels and one at RS232 levels.
The header plug that replaces the LM1488 has jumpers between pins 2 and 3, and between pins 5 and 6. The header plug that replaces the LM1489 has jumpers between pins 1 and 3, and between pins 4 and 6. ICs are numbered counter-clockwise when viewed from the top, with pin 1 always in the corner marked with a dot, notch, or beveled side. 73, Jim
--- Larry [email protected] wrote:
Hello everyone! I use the KCT to control my rotor, which works fine. However... I was looking through the junk drawer tonight, and found the original anti-static bag which has two 14 pin IC-style jumper boards inside. One of them has only 2 jumpers - one between pins 1 & 3, the other jumper between pins 4 & 6. These are both made with blue wire. The other IC block has a solder bridge between pins 2 & 3 and 5 & 6. Did these come with the board in its early stages of design? Does it even belong with the KCT? Just curious what these are for. I don't recall reading in the manual about them, either (tracker OR tuner). TIA... Larry N1MIW FN41
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