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2 VHFs sharing 1 VHF antenna

  
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Combining multiple VHFs on single ant - 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..

2 VHFs sharing 1 VHF antenna - I have an Apelco VHF mounted in the nav station with a remote speaker in the cockpit. A Raymarine handheld is kept near the helm. Of course the handheld has nowhere near the range of the fixed VHF below. Instead of replacing the good] Apleco..

2 VHFs sharing 1 VHF antenna - I have an Apelco VHF mounted in the nav station with a remote speaker in the cockpit. A Raymarine handheld is kept near the helm. Of course the handheld has nowhere near the range of the fixed VHF below. Instead of replacing the good] Apleco..
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kailaniskipper

External


Since: Feb 24, 2005
Posts: 1



(Msg. 1) Posted: Thu Feb 24, 2005 12:45 am
Post subject: 2 VHFs sharing 1 VHF antenna
Archived from groups: rec>boats>electronics (more info?)
I have an Apelco VHF mounted in the nav station with a remote speaker in
the cockpit. A Raymarine handheld is kept near the helm. Of course the
handheld has nowhere near the range of the fixed VHF below. Instead of
replacing the [perfectly good] Apleco VHF, I would like to install a
second fixed VHF at the helm connected in such a way to share the mast
top antenna.

Is there an adapter or junction/splitter type device which will allow
both VHFs to be on at the same time (not transmitting, of course) and
share a common antenna without manual switching or other intervention?


--
kailaniskipper

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Figment

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Since: Sep 04, 2005
Posts: 11



(Msg. 2) Posted: Thu Feb 24, 2005 4:27 pm
Post subject: Re: 2 VHFs sharing 1 VHF antenna [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
Don't do it, you'll probably wreck both sets.
Fit a second antenna, that way you have a complete back up if anthing goes
wrong.

"kailaniskipper" <kailaniskipper.1kxlcu.RemoveThis@news.boatbanter.com> wrote in
message news:kailaniskipper.1kxlcu@news.boatbanter.com...
>
> I have an Apelco VHF mounted in the nav station with a remote speaker in
> the cockpit. A Raymarine handheld is kept near the helm. Of course the
> handheld has nowhere near the range of the fixed VHF below. Instead of
> replacing the [perfectly good] Apleco VHF, I would like to install a
> second fixed VHF at the helm connected in such a way to share the mast
> top antenna.
>
> Is there an adapter or junction/splitter type device which will allow
> both VHFs to be on at the same time (not transmitting, of course) and
> share a common antenna without manual switching or other intervention?
>
>
> --
> kailaniskipper

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Meindert Sprang

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Since: Jul 09, 2003
Posts: 193



(Msg. 3) Posted: Thu Feb 24, 2005 11:23 pm
Post subject: Re: 2 VHFs sharing 1 VHF antenna [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
"Figment" <delete_this_bit_brunyard.DeleteThis@ntlworld.com> wrote in message
news:JfnTd.271$HG5.135@newsfe1-gui.ntli.net...
> Don't do it, you'll probably wreck both sets.
> Fit a second antenna, that way you have a complete back up if anthing goes
> wrong.

I have seen VHF power amps that have an electronic form of switching that
works with 1/4 wavelength stubs of coaxial cable, shorted by shottky diodes.
Such a setup can also be made for connecting two radios to one antenna. Any
ham can build such a thing.

Meindert
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Ed5

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Since: Oct 01, 2003
Posts: 138



(Msg. 4) Posted: Fri Feb 25, 2005 4:15 pm
Post subject: Re: 2 VHFs sharing 1 VHF antenna [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
I agree... Don't do it... My boat has 2 9DBs on it, one for each radio
BUT, I understand many people cannot do this... I rigged my previous
boat has the MAIN radio on the MAIN antenna. The backup (Cabin radio)
is connect to a small antenna (3' I think... typical sailboat antenna)
that I left stuffed vertically in a side compartment... not great for
long range but the cabin radio is usually used to talk to other boats in
the marina (When's happy hour.. etc), listening the the weather, etc
etc. I also ran an EXTRA wire from the back on one radio to the other
and keep a F-F aboard. THEN, If one radio breaks or an antenna breaks,
I can rewire very quickly.

Good luck






Meindert Sprang wrote:
> "Figment" <delete_this_bit_brunyard.TakeThisOut@ntlworld.com> wrote in message
> news:JfnTd.271$HG5.135@newsfe1-gui.ntli.net...
>
>>Don't do it, you'll probably wreck both sets.
>>Fit a second antenna, that way you have a complete back up if anthing goes
>>wrong.
>
>
> I have seen VHF power amps that have an electronic form of switching that
> works with 1/4 wavelength stubs of coaxial cable, shorted by shottky diodes.
> Such a setup can also be made for connecting two radios to one antenna. Any
> ham can build such a thing.
>
> Meindert
>
>
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James Hebert

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Since: Jun 10, 2004
Posts: 18



(Msg. 5) Posted: Mon Feb 28, 2005 12:19 am
Post subject: Re: 2 VHFs sharing 1 VHF antenna [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
In article <bruceg-5AE779.10220626022005.DeleteThis@netnews.worldnet.att.net>,
Bruce in Alaska <bruceg.DeleteThis@btpost.net> wrote:

> There is a GIANT difference between comining two transmitters to a
> single antenna, and combining two TRANCEIVERS to a single antenna.

Especially when they may be tuned to the same frequency!
If there was some frequency separation it would be much
easier to accomplish.
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