TB,

First - Use a Metal Case for the Antenna Switcher [.]
- - - WHY ? Ease of Grounding Everything and RFI/EMF Reduction.

? Are you running Coax Cable or straight wires into this Antenna
Switcher from your Random Antennas ?

A "SOLID" Ground should be connected to the Antenna Switcher's Case
Ground.
- - - All un-used (Switched Off) Antenna Inputs should have heavy wire
(braid) connections to the Case Ground of the Antenna Switcher.
TIP: Put as "Much" Planning, Time, Money and Effort in to your
Grounding System as your Antenna System.

The Output of the Antenna Switcher should have some sort of Static
Surpression/Reduction to prevent damage to the radio's ESD sensitive
front end.

If you are using direct Random Wire Antenna feeds to the Antenna
Switcher: Then consider building in a 9:1 Matching Transformer into
the Switcher to offer some ESD/RFI/EMF protection and Isolation.

If you are using Coax Cable feedline for your Random Wire Antennas to
the Antenna Switcher: Then consider building in a 1:1 Matching
Transformer into the Switcher to offer additional ESD/RFI/EMF
protection and Isolation.

Recommend the use of a 'short' Coax Cable between the Antenna Switcher
and the radio(s).

iane ~ RHF
..
..
= = = (TommyBoy)
= = = wrote in message om...
I had an earlier post about fabricating an antenna switcher for my
random wires, and one of the suggestions was to try the $11 RS a/b/c
video switcher. I did and there was no isolation at all. Don't waste
your time with this one.

I eventually put together a switcher using toggle switches. Works
great. Now I just need to make a nice finished case since I know it
works well.