[Elecraft] switchbox KX3 to signalink/mike+headphones

[Walter Underwood]

It might work to split it into two problems.

MFJ makes some boxes to switch microphones and rigs, 2:1, 1:2, and 2:2. Maybe more.

https://mfjenterprises.com/products/mfj-1260 <https://mfjenterprises.com/products/mfj-1260>

There are also simple 2- and 4-channel mixers that would do it.

I use a simple splitter for the headphones and drive everything all the time.

https://smile.amazon.com/Belkin-RockStar-5-Jack-Headphone-Splitter/dp/B00904WS2K/ <https://smile.amazon.com/Belkin-RockStar-5-Jack-Headphone-Splitter/dp/B00904WS2K/>

This is a headphone distribution amp (build with op-amps), so you can adjust gain for each output. $29.

https://smile.amazon.com/Behringer-HA400-Ultra-Compact-4-Channel-Headphone/dp/B000KIPT30/ <https://smile.amazon.com/Behringer-HA400-Ultra-Compact-4-Channel-Headphone/dp/B000KIPT30/>

Rigblaster makes some nice stuff, though I’m not that familiar with it. I think they have boxes that would replace the Signalink and do the switching.

http://www.westmountainradio.com/rigblaster.php <http://www.westmountainradio.com/rigblaster.php>

wunder
Walter Underwood
K6WRU
https://observer.wunderwood.org <https://observer.wunderwood.org/> (my blog)

> On Jul 24, 2022, at 3:52 PM, <herr42 at comcast.net> <herr42 at comcast.net> wrote:
> 
> 
> I respect that this could be whipped up.
> 
> But
> 
> I wanted to take advantage of the user community to see if there were slick
> products out there.
> 
> 
> 
> -----Original Message-----
> From: elecraft-bounces at mailman.qth.net <elecraft-bounces at mailman.qth.net> On
> Behalf Of Ed Cole
> Sent: Sunday, July 24, 2022 1:21 PM
> To: elecraft at mailman.qth.net
> Subject: Re: [Elecraft] switchbox KX3 to signalink/mike+headphones
> 
> I made something similar:  I wanted to breakout the mic PTT line from my
> IC9700 to control a sequencer (which was already wired to control preamps,
> TR relays and amplifier PTT's).
> 
> I found 8-pin connectors on Amazon that would mate to the IC9700 mic jack,
> used RG-174 for shielded cable for the mic audio jumper inside a small
> aluminum box and used cat-5e for mic cable jumper from radio to switch box
> and added a clamp-on ferrite bead at the radio end (for ac hum/noise
> rejection).
> 
> I used 4-pin mic connectors to route the PTT to/from the sequencer (and
> using more cat-5e for that jumper).  I added a toggle switch to defeat radio
> PTT if I was running my K3 with the sequencer to avoid accidental keying of
> the IC9700 by the sequencer.
> http://www.kl7uw.com/IC9700_Hints&Measurements.htm
> 
> For interfacing KX3 mic/signal link, you will need a four conductor mini
> phone jack to mate into the radio.  They can be found with a little
> searching.
> 
> I made a computer interface for my KX3 using a West Mountain Rigblaster
> Nohmic:
> http://www.kl7uw.com/KX3_Computer_Interface.htm
> 
> These are NOT hard to do projects.  No surface-mount soldering of computer
> components, involved,
> 
> 73, Ed - KL7UW
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