[Elecraft] K3 line out - Stereo vs Mono

[Joe Subich, W4TV]

Paul,

The short answer is the warnings do not apply to Line Out.

Line Out is always stereo but both right and left are transformer
coupled (you don't need the Rascal) and the primaries of both
transformers contain resistors that would limit current from the
DAC to a safe level even of the output of the transformer were
shorted.  I refer you to the K3 Schematic package on the Elecraft
web site.

73,

    ... Joe, W4TV


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
> . . .
>
> 73, Paul VE1DX
>
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