Hooray for Gary!
I have one of those automatic switches on my boat. I have two VHF radios
connected to one antenna through the switch. It's all automatic, didn't cost
$4000-$8000 (!) and doesn't blow anything up!
Both of my radios are normally in the scan mode, one is connected to my ADF
(which is connected to the automatic switch), the other is my primary
communications radio. They each receive independently and simultaneously.
Keying the mike of one radio isolates the other radio while the mike is
being keyed to avoid damage.


"Gary Schafer" wrote in message
...
I think it is Shakesphere that makes an automatic switch for this
purpose. Look in the West marine cataloge.

Regards
Gary

On Thu, 24 Feb 2005 00:07:56 +0000, kailaniskipper
wrote:


I have a VHF installed in our cabin with only a remote speaker in
cockpit. Instead of replacing the unit with a newer VHF with remote mic
and/or station options, I would like to simply add another standard VHF
radio at the helm and share the antenna (located at the top of a 55'
mast).

Is there a standard convention available which will allow both radios
to share a common antenna without manual switching or other
intervention?