[Elecraft] K3 line out - Stereo vs Mono

[Don Wilhelm]

Paul,

I believe you may be trying to address too many issues at once. Take 
then one at a time.
As far as the speaker goes, I suggest the safest solution is to re-wire 
the plug to a stereo plug using only the tip and the shell.

Look st the plug - if the plug does not have a ring on it, then it is 
not a stereo plug.

The  speakers question does not have any direct relationship with the 
MMTTY input.

73,
Don W3FPR

On 12/6/2012 8:15 PM, Paul M Dunphy wrote:
> Does anyone know if the warning mentioned here in relation an external 
> speaker and a mono speaker applies to the K3's line out (which is also 
> stereo):
>
> http://www.elecraft.com/manual/E740107E%20K3%20Owner%27s%20man%20errata%20D10-1.pdf 
>
>
>     The reason I ask is I have an old Buxcom Rascal circa 2007-2008 
> that I used for RTTY and PSK on my ICOM PRO3 with great success . . . 
> was thinking of just getting the K3 cable (Part 5DK3) and using it 
> with MMTTY as I had been doing.
>
>     The concern is the 1/8" plugs on the 5DK3 look to be mono for both 
> audio in and audio out on it's schematic diagram.
>
> http://www.packetradio.com/catalog/index.php?main_page=product_info&products_id=2514 
>
>
>     It's hard to see because the diagram is so small, but I am 99% 
> sure they are 1/8" mono plugs.
>
>     I want to do FSK, not AFSK.  Otherwise I'd just use a couple of 
> stereo 1/8" inch cables to the computer.  Seeing as the Buxcom Rascal 
> and 5DK3 combo will key the RCA PTT as well as handle the TX and RX 
> audio, I was going to go that route.  Just switch the old ICOM cable 
> with the 5DK3.  Has anyone done this?  Seems like a simple way . .. on 
> the PRO3 I used this setup for RTTY, PSK, JT65, etc.  I also read that 
> you shouldn't try to key the PTT line using the DB9 serial 
> communications port, and since the Rascal is already working with 
> MMTTY . . .
>