[Elecraft] K2 external auto ATU

[Don Wilhelm]

  Larry,

The signal in that long cable that is likely to prove troublesome is the 
AUXBUS.  It is a one wire communications signal path for all the 
microprocessors in the K2 system.  If the main MCU sends out a query, it 
expects a response in a given number of microseconds, and if that 
response is not received in time, the option will be declared off-line, 
absent, or otherwise broken.  The capacitance of a long cable can also 
be troublesome due to shaping the edges of the relatively fast digital bits.

I have no idea how long the cable could be, but Elecraft has recommended 
in the past no greater than 6 feet (less than 2 meters).  I would 
suggest you cut a cable of your desired length and try it - if all 
functions work, then you are welcome to leave it that long, but if it 
does not work, you are only out the extra cable.

On 2/1/2011 1:11 PM, Larry Dodson wrote:
> Advice/experience will be appreciated.
>
> I have an upstairs shack (ugh) with much RF.  Tried to earth without much
> luck.  Should use a balanced antenna, but.
>
> I have a windom antenna cut to 20%x80%, overall length 136 feet; used for
> 80-thru-10 meters. It is fed with vertical twin lead for approximately 20
> feet to a 4:1 balum and from there with coaxial to my rig. Whole antenna is
> 30 feet above the ground.
>
> Now my question.  I am using a K2, and have built a KPA100 and KAT100 in
> separate enclosure.  I would like to move the KPA100 and KAT100 in separate
> enclosure to the twin lead from antenna and use as an external auto ATU,
> then coaxial to shack, the distance being approximately 30 feet from the
> twin lead. I can locate external auto ATU inside of garage.
>
> What would be the problems? RF connection from K2 for 30 feet; control cable
> from K2 for 30 feet (maximum distance ?); 12v power?
>
> Thanks in advance -
> Larry (G0IKE) k2 - 2424
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