[Elecraft] [K3] Detuning antenna per band and QSK

[Vic Rosenthal]

I suggest using a vacuum relay at the antenna. I wouldn't want to switch a relay box even with a sequencer at a semi-QSK rate.

Vic K2VCO /4X6GP 

> On Dec 20, 2014, at 10:45 PM, Jim Miller <jim at jtmiller.com> wrote:
> 
> I use and like QSK on my K3 but I'm now looking at detuning my 160 inverted
> L to avoid reradiation into my beverages when in receiving.
> 
> I'm looking at what it will take to do that and it appears that if the 160
> inv-L is just deselected by the remote DXE relay box it will just be an
> ungrounded 1/4 wave which shouldn't present problems on 160.
> 
> I could implement a sequencer in the shack to do this by interrupting the
> relay select line that controls the 160 antenna on a per band basis but
> that leaves the question of what to do about QSK since the relay is
> specified to operate no sooner that 15mS. That will likely impact the clean
> CW and be undesireable.
> 
> I can decode the band info and get the info about whether it is in TX or RX
> mode and probably inhibit the K3 until the delay has expired.
> 
> But I'd need to kill QSK on 160 alone to do this.
> 
> Is there a way to do QSK on a per band basis?
> 
> 73
> 
> jim ab3cv
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