[GreenKeys] GreenKeys Digest, Vol 102, Issue 57

[Jason]

Me three, please, thanks!

73,
Jason W6IEE


On Jul 22, 2012, at 3:55 PM, greenkeys-request at mailman.qth.net wrote:

> Date: Sun, 22 Jul 2012 17:54:14 -0500
> From: "Jack" <wa2hwj at att.net>
> Subject: [GreenKeys] Idle Line Control, ETC.
> To: <greenkeys at mailman.qth.net>
> Message-ID: <002901cd685c$f6f39190$e4dab4b0$@net>
> Content-Type: text/plain; charset="us-ascii"
> 
> 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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