[Elecraft] KAT500 as a remote-controlled tuner

[Don Wilhelm]

Brian,

The Keying line should not need buffering.  It is either an open circuit 
or a closed circuit.

Yes, you may be asking for trouble if you attempt to use the AUX cable 
with a long length.

So connect it for the basic mode connections only.  KeyOut from the 
transceiver to the KAT500 and then from the KAT500 to the amplifier KeyIn.

73,
Don W3FPR

On 11/3/2018 1:23 PM, Brian Hunt wrote:
> I've been looking at this very issue as part of a project to QRO on the 
> lower bands.  I currently have an MFJ autotuner at the end of a 130 ft 
> coax run out to the garden.  My low band doublet is fed with a balun and 
> ladder line from there.  It's really impractical to run the AUX cabling 
> out and back as indicated in the KAT500 manual.  But it may be practical 
> to run a keying line out and back and a serial line as Wayne indicated. 
> Would the key line need buffering with that long a run?  A total of 5 
> wires required. A CAT-5 cable could provide a twisted pair for each 
> signal line to avoid RFI.  Power for the KAT500 could be provided using 
> a bias-T arrangement as I do now.  Any other thoughts/considerations?
>