[Elecraft] OT: CW Paddle A/B switch

[dick at elecraft.com]

If two entirely different rigs pull paddle inputs up to different voltages
(say 5 and 12V), and with  the paddle lines tied together, current may flow
from one rig to the other when the paddle is not pressed.   A turned-off rig
might float or might pull down a paddle input. I'd measure the current flow
in the various scenarios (one or the other rig on/off, paddle inputs not
grounded).  A few diodes might remove potential problems.

If two rigs are turned on (for whatever reason), would you want them both
keyed?  

I'd personally favor a switch, and consider microphone, PTT footswitch,
keying lines with that same switch.  But that's possibly a lot more complex
than you need.

I bought an NCS-3240 Multi-Switcher some years back but haven't pressed it
into use.  It switches microphone and key line, but assumes an external
keyer rather than one built into the radio.

I personally found it less work and more flexible to use different paddles
and different microphones.

73 de Dick, K6KR

-----Original Message-----
From: elecraft-bounces at mailman.qth.net <elecraft-bounces at mailman.qth.net> On
Behalf Of Jim Rhodes
Sent: Sunday, March 11, 2018 09:51
To: Doug Hensley <w5jv at hotmail.com>
Cc: Elecraft List <elecraft at mailman.qth.net>
Subject: Re: [Elecraft] OT: CW Paddle A/B switch

A question. Do you really need a switch? Are both rigs going to be on at the
same time? If not a simple headphone splitter should do the trick.

Jim Rhodes
K0XU

On Mar 11, 2018 9:52 AM, "Doug Hensley" <w5jv at hotmail.com> wrote:

> I have two radios and one cw paddle.  I'm looking for a small inline 
> A/B switch as would be used on stereo headphone sets to switch between 
> sources.  The whole thing would be a "Y" cable with two 1/8" male 
> stereo plugs on one end and a single female jack on the other.  
> Switching would choose which male plug is active.  Yes I can build one 
> but before I reinvent the wheel, I thought someone might have a source.
>
> I'm tired of plugging and unplugging and I don't want or have the 
> extra space for another paddle.
>
> Has anyone found such a switch?
>
> Reply by private email please as this is off topic.
>
> Thanks,
>
> Doug W5JV
>
>
>
>
>
>
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