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?

The 2005 BoatUs catalog is offering a Shakepeare device
called "Automatic Two-way Antenna Selector" for $80.

The description claims the switch senses transmit power, and
connects that radio to the antenna. Switch time is 100 ms. The device
draws 200 ma. Max RF power is 30W.

For less money ($43), there is a manual version...rated at 600W PEP.

Another device which may be of interest is a $90 box that measures
VHF forward power, and return loss (SWR). It also has a feature called
"radio receiver check mode"...whatever that means.

Norm B