[GreenKeys] Idle Line Control, ETC.

[Nico de Jong]

Thanks Jack, that sunds great !
/Nico
  ----- Original Message ----- 
  From: Jack 
  To: greenkeys at mailman.qth.net 
  Sent: Monday, July 23, 2012 12:54 AM
  Subject: [GreenKeys] Idle Line Control, ETC.


  ZCZC

   

  After spending an enjoyable day in the shack (while the

  weather hit over 100 outside) I have come up with a simple

  Idle Line Motor control circuit. By changing some

  time constants (resistor and capacitor) it could also be

  used as a "KOX" (keyboard operated switch - to turn

  on the rig when typing and then turn the rig off after

  typing stops).

   

  Thanks to the previous work of George, W7TTY, and Gil,

  and the old Radio Shack Engineers Notebook, I cobbled

  together an opto-isolator and 555 timer chip circuit

  that follows loop activity and, when loop activity stops,

  turns off the motor relay after about 25 seconds idle

  marking. I put this together using the proverbial

  "junk box parts".

   

  I'll clean up the schematic and have it ready for anyone

  who is interested later today.

   

  I'll also have an RS232-to-loop circuit (TX and RX) in a few days. It

  will include a parts list for a HV loop supply. I might have circuit

  boards made for both of these gadgets if there is enough interest.

   

  73,

  Jack K0TTY

   

  NNNN



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