[TenTec] Questions on Corsair II CW speed

[Steve Hunt]

Steve,

On final piece of info ..... I just looked carefully at my Speed Pot and found that the resistance doesn't change at all over the first 90 degrees of travel and the last 90 degrees, so a lot of the problem is just the mechanical design of the Pot.

When the control is fully Clockwise (fastest) mine goes at speeds I would never use, so one solution is to put a resistor in series witht the Pot slider to limit the maximum speed. Just did this with mine with the following results:

Resistor: 27 KOhm - max speed 20 wpm
Resistor: 18 KOhm - max speed 25 wpm
Resistor: 10 KOhm - max speed 35 wpm

With the resistor in place its still very "non-linear" but you get a bit more control range.

Hope this helps,

Steve G3TXQ

  Another thing is the silly keyer speed control pot's usable range is
  crammed into about 15 degrees? What's up with that? Plus the manual
  does not include the keyer schematic. Although it's referenced in the
  block diagram as the "logic board" no. 81246. Someone have the
  schmatic for this?