[nrv-hams] Antenna Switches - should I be concerned?

[Larry W McCoy]

Hi Cam,
I have a 2 way Alpha Delta switch and have an HF beam and several wire 
antennas including a sloper using the tower and can't detect any problems. 
Position 1 is a 160 m windom,  Position 2 has a remote switch for 5 antennas 
:160 loop, Inv Vee 60m, rotatable dipole 30m, sloper 75m , HF log periodic.

They seem to behave, but I don't know how.
Larry
W4LWM

-----Original Message----- 
From: Cam Coble
Sent: Monday, April 18, 2016 8:32 PM
To: NRV-Hams: A mailing list for members of the New River Valley (VA) 
Amateur Radio Club.
Subject: [nrv-hams] Antenna Switches - should I be concerned?

I'm looking to use a switch in my home rig and possibly mobile rig setups,
but stopped short when thinking it through (I do that time to time).

I purchased a quality 2 position switch (Daiwa CS-201). I want to switch my
rig to connect between my current antenna (OCF 80m Dipole), and any other
creation I may come up with.

It seems that the design (as seems common for these type switches) is to
keep the ground/shield common (shorted) between all three posts, and only
switches the center conductor to connect the source with position (antenna)
1 or 2. Maybe a better way to write it is that it's a single throw double
pole for the center conductor, and shields are always connected.

My concern is that with this design, any antennas connected to the shield
have the possibility of resonating during transmit. Never-mind that I could
be receiving signals from all as well.

Am I overthinking this?
Seems that if I have my OCF dipole on position 1 and a 20m dipole on
position 2, there is a possibility of some really *weird* reactions.

Any guidance/wisdom/links would be appreciated!

Thanks!
73
--
Cam Coble - W4XXV
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