[Elecraft] [K3] Shorting K3 PHONE jack outputs (WAS OT: Stereo to mono adapters)

Brian Alsop alsopb at nc.rr.com
Fri Dec 3 15:16:01 EST 2010


RG-174 is fine for one circuit.  I'd really like to find some affordable 
shielded dual center conductor stuff somewhere.  Yeah, one can always 
make two wire twisted pairs, but a good shield and outer jacket ends up 
missing. Cat-x is overkill with too many conductors.

73 de Brian/K3KO

On 12/3/2010 19:45, James Sarte (K2QI) wrote:
> I'm assuming however that a 2 circuit plug into a 3 circuit adapter should
> be fine; i.e. plugging a 3.5mm mono plug into 1/4" stereo to 3.5mm stereo
> adapter, which is then inserted into the 1/4" phone socket?
>
> Tnx,
> James K2QI
>
> On Fri, Dec 3, 2010 at 2:14 PM, Jim Brown<jim at audiosystemsgroup.com>  wrote:
>
>> On 12/3/2010 8:29 AM, James Sarte (K2QI) wrote:
>>> Just wanted to get some advise before I continue with my experiment.
>>
>> Two-circuit 1/8-in plugs should NOT be used at the output of the K3. A
>> 3-circuit plug is needed. Nearly all pre-made patch cables are junk, and
>> many are wired wrong for our uses. We are hams. We can MAKE our own
>> patch cables, and we can study the schematics to see how to wire them.
>> Elecraft schematics are on line. Good quality 1/8-inch connectors are
>> made by Neutrik and Switchcraft, and are available on line from good pro
>> audio vendors like Full Compass Systems in WI.  I use miniature coax to
>> build them (like RG174, etc.)
>>
>> For part numbers, see http://audiosystemsgroup.com/HamInterfacing.pdf
>> There's a table on one of the slides.
>>
>> 73, Jim Brown K9YC
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>
>



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