[Elecraft] {OT} - Variation on use of a coaxial switch (stan levandowski)

[John]

What Dale describes below is a very similar configuration to the MFJ switch
I was given a year or so ago - an MFJ-1703.

I just popped the lid off and took a photo of the insides for you:

https://www.dropbox.com/s/h28jny6vrkj7rdj/2017-01-01%2018.28.00.jpg?dl=0

The only difference being that it's basically a DPDT slide switch, rather
than a rotary. Works just as well.

At least, I think that's pretty much what he was describing anyway. Stick a
dummy load on one output and your antenna on the other, and your two rigs on
the two inputs.

73, and a firm left handshake,
John (XLX)

-----Original Message-----
From: Elecraft [mailto:elecraft-bounces at mailman.qth.net] On Behalf Of Dale
Martin
Sent: 01 January 2017 17:31
To: elecraft at mailman.qth.net
Subject: Re: [Elecraft] {OT} - Variation on use of a coaxial switch (stan
levandowski)

Stan,
I haven't taken the time to read all the other responses, but have you
considered building your own coax switch. 

Parts: 1 aluminum box, 4 SO-239's, 1 two-pole, multi-position rotary switch
(you only need 2 positions, but more is okay), 100w dummy load

Mount the SO-239's (J1-J4) and rotary switch

Wire up the switch thusly: 
Pole 1 to J1 (KX2)
	Contact 1 to J3 (antenna feedline)
	Contact 2 to J4 (dummy load)
Pole 2 to J2 (KX1)
	Contact 1 to J4 (dummy load)
	Contact 2 to J3 (Antenna feedline)

When you switch one radio the antenna, the other radio is then put on the
dummy load. 

73,
Dale, kg5u


> ------------------------------
> 
> Message: 3
> Date: Fri, 30 Dec 2016 17:49:21 -0500 (EST)
> From: stan levandowski <sjl219 at optonline.net>
> To: Elecraft at mailman.qth.net
> Subject: [Elecraft] {OT} - Variation on use of a coaxial switch
> Message-ID: <1d09982f.1e408.15951ec5b8d.Webtop.41 at optonline.net>
> Content-Type: text/plain; charset=UTF-8; format=flowed
> 
> I would like to use a coaxial switch for an unintended use and I'm not
sure if
> it's a good idea in terms of RF isolation and potential equipment damage.
> 
> I'm no expert in this area but I know this list is a wealth of expert
opinion, so
> here's my question:
> 
> 
> I want to buy a two position coaxial switch. ?I want to connect ONE 
> antenna to it and switch this antenna between a KX2/KXPA100 (100 
> watts) and a KX1 (about 3 watts). ?The coax cable coming from this 
> switch to the KX2 is a short piece of RG8X and the coax cable going 
> from this switch to the KX1 is 25' of RG-174 (yes, I already computed 
> the dB loss and I can live with).?
> 
> 
> Am I likely to cause any damage to to either piece of equipment?
> 
> 
> Thanks,
> Stan WB2LQF
*************************************

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