[Elecraft] KX3 / K3 Antenna Sharing

[Dick Dievendorff]

Some of the relay-based antenna switches actually have two sets of relay
contacts between the antenna and the not-selected radio. This can improve
the isolation.

However the difference between "S9+" and "I can barely hear" is a whole lot
of dB, and asking for complete silence is asking for a lot. 

http://www.qth.com/topten/abss.htm

Dick, K6KR





-----Original Message-----
From: elecraft-bounces at mailman.qth.net
[mailto:elecraft-bounces at mailman.qth.net] On Behalf Of Jim Bennett
Sent: Tuesday, December 31, 2013 12:56 PM
To: Elecraft Reflector Reflector
Subject: Re: [Elecraft] KX3 / K3 Antenna Sharing

Thanks for the info all -

I looked at that Bird 6 position switch - about 1/2 the cost of my KX3 -
yikes! Think I'll pass on that one. I do have a Daiwa 2 position switch that
I've hooked up to share my antenna - one side to the K3, the other to the
KX3. Seems to work OK, although when a strong signal (S9+) on the K3, I can
still hear it when the switch is set to the KX3. I wonder if the Alpha/Delta
switches have any better isolation that thiat

Jim / W6JHB

On   Tuesday, Dec 31, 2013, at  Tuesday, 12:38 PM, Edward R Cole wrote:

> I am using a couple DAIWA manual coax switches.  2-pos selects either
K3/10 or KX3 (at 12w) and 4-pos is for antenna selection at 300w from the
amplifier.  I do not use coax switches at QRO levels but I only run that on
6m and 2m with dedicated antenna so no switching is needed (I do use coax
relays).
> 
> I am getting a used B&W 5-pos switch which will be used at HF/6m under
300w.  I have to check it out first.
> 
> 73, Ed - KL7UW
> http://www.kl7uw.com
>    "Kits made by KL7UW"
> Dubus Mag business:
>    dubususa at gmail.com
> 
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