[Elecraft] KAT100 Won't Tune When IC706 Also Turned On

[W3FPR - Don Wilhelm]

Jonathan,

We need to understand your setup with the new switch included a bit better
before giving a proper answer, but I will 'go out on a limb' and make some
assumptions to see if it provides you with a quick answer.

Where did you put the switch?  If it is between the K2/100 and the KAT100,
that would be a reasonable explaination for your problem - the KAT100 must
be connected to the K2 on both the coax and the interconnecting cable to
tune properly (RF must flow during the tune operation).  The switch must go
on the antenna side of the KAT100 - and if it is located there and the 706
is connected to the antenna for receive, you will attempt to tune the KAT100
into an open circuit if the K2 TUNE button is pressed.

Another possible answer (guess) is that the 706 is putting DC on the coax
(for use with an external preamp maybe?) and somehow interferes with the
tuner operation.

73,
Don W3FPR


> -----Original Message-----
>
> Any thoughts on this one:  Today I hooked up an antenna switch so
> I could run the K2/100 and the ICOM 706 and switch between them
> and use one or the other when I want to.  Both radios run off the
> same Astron SS-25 power supply.  When I have the 706 turned on
> and RX only, the KAT100 will not tune 40 or 80 meters.  If I turn
> off the 706, the KAT100 works perfectly.  It tunes all other
> bands with the 706 turned on. The 706 is only receiving so I
> wouldn't think it would be drawing enough current to effect the
> K2.   Any ideas on this gremlin?
>
> Jonathan Gottlieb
> WA3WDK
> K2/100 #4856
>
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