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

[James Sarte (K2QI)]

Hi Don,

No such luck on finding schematics for the adapters, but I did test
everything out with my ohmmeter.  It looks like the adapters I
purchased do exactly what you suggest.  Ring and tip of the adapter is
connected to just tip on the other end of the mono cord, while sleeve
are shorted on both ends.

Seems to work well enough, and as I said in my previous emails, both
tip and ring present the K3 with a 22 ohm load when connected to the
ANEM.

Only thing I have to figure out now is what to do about the audio
being out of phase; there is a hollow, echo type sound that is
produced now that both channels are being combined into a single
channel.

73,
James K2QI

On Sat, Dec 4, 2010 at 1:10 AM, Don Wilhelm <w3fpr at embarqmail.com> wrote:
>  James,
>
> The only way to be certain is to examine the schematic of the adapter (I
> know, sometimes that is hard to come by), or to dope it out with your
> ohmmeter.  I have found some that do it either way.
>
> The one you want is one that connects the ring and tip of the stereo plug to
> the tip if the mono jack.  That one will connect both the left and right
> channels together and do what you desire.
>
> Sorry if the adapter nomenclature is confusing - in the midst of confusion
> and lack of information about how the various adapters are wired, it is
> usually easier to build your own adapter rather than relying on the "smarts"
> of someone else who assumes (but does not know) what you are trying to
> accomplish.
>
> 73,
> Don W3FPR
>
>