In order to use my 301 remote tuning encoder as well as
have my computer interface, I fabricated a 25-pin Y-cable.
To make it as versatile as possible, I carried all 25 pins
into both legs of the Y. But my tuning encoder wouldn't
work with the computer plugged in. Dissecting the
connections, the 301 uses pins 6, 8, and 16, with pins 1
and 14 grounded. The computer cable uses pins 2 through 8,
plus 20 and 22 on the OMNI 25-pin connector. Disconnecting
EITHER pin 6 OR pin 8 (the two pins common to both the
computer and the 301) from the computer link made the 301
work. Neither affected the computer operation. In the end,
I clipped BOTH pins 6 and 8 from the computer link (pins 1
and 6 on the 9-pin computer connector). Out of curiosity,
does anyone know what the computer uses these pins for,
and why the 301 doesn't work with them connected?
Ten-Tec's 236 Y-cable doesn't carry all 25 pins, just
the pins needed for the various functions.
steve - w3grg
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