Vhf vehicle antenna adaptor?

[nick223]

Does anyone know or can lead me in the right direction. For a vhf/vhf antenna adaptor. So I can hook 2 mobile radios up to 1 antenna. Already have 3 antennas and don't really want a 4th antenna plus this radio won't be used alot.

Thanks

 

[kayn1n32008]

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Going to need a lot more info to be able to give you an answer. With the lack of detail the short answer is:

maybe

 

[WB4CS]

Go to HRO (ham radio outlet) and search for antenna diplexers and duplexers. It sounds like that's what you need.

 

[nick223]

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Going to need a lot more info to be able to give you an answer. With the lack of detail the short answer is:

maybe

Not sure what info you need? I have 2 kenwood tk 7180H mobile VHF radios. And I already have the vhf antenna installed. I like to find an adapter box where you can plug the antenna too then connect the 2 radio antennas to that box.

 

[kayn1n32008]

Not sure what info you need? I have 2 kenwood tk 7180H mobile VHF radios. And I already have the vhf antenna installed. I like to find an adapter box where you can plug the antenna too then connect the 2 radio antennas to that box.

Yea, not going t happen. Only way will be with an antenna switch, but down side is only using one radio at a time.


Sent from an unknown place...

 

[WB4CS]

Not sure what info you need? I have 2 kenwood tk 7180H mobile VHF radios. And I already have the vhf antenna installed. I like to find an adapter box where you can plug the antenna too then connect the 2 radio antennas to that box.

Ahh, never mind my diplexer/duplexer idea then. That would only work for 1 antenna on 2 radios on 2 different bands. (Example: Using a dual band antenna on 1 VHF and 1 UHF radio)

 

[DisasterGuy]

This could technically be possible (but would not be practical or cost effective). The only way to do what you describe would be through the use of a combiner and it would require that each radio only operate on a single frequency. You are looking at spending a few thousand dollars and, at VHF, the combiner would pretty much fill the trunk. Here is an example: http://www.telewave.com/pdf/TWDS-1014.pdf

 

[krokus]

As others have pointed out, you can not do exactly what you asked, if the radios are on the same band. (Typically VHF-high.)

To avoid additional antenna mounts, you could use multi-band antennas and a diplexor, assuming you have multiple bands. Hams do this often, with 144MHz and 440MHz.

 

[mmckenna]

Wait a minute, we seem to be assuming some things here..

Nick,

What is the exact usage of these radios? Do you do, or plan on doing, any transmitting with these radios, or are the for receive only?
-if it is for receive only, a simple splitter will work fine, however you will never be able to transmit without destroying the other radio.
-if you do want to transmit, then you are pretty much out of luck.

If you plan on transmitting, then it would be worth looking at what other antennas and radios you have to see what can be combined. If you have radios on other bands, then there could be the possibility that you could install a dual band antenna and get what you need.

If you decide to install two dedicated VHF radio antennas, then you need to put a lot of spacing between your antennas if you are going to transmit. Even without a direct connection, having two separate antennas can induce enough energy into the other radios to damage the receiver.

 

[kayn1n32008]

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Does anyone know or can lead me in the right direction. For a vhf/vhf antenna adaptor. So I can hook 2 mobile radios up to 1 antenna. Already have 3 antennas and don't really want a 4th antenna plus this radio won't be used alot.

Thanks

Again, as I stated in my first post. We need more info. What bands are the radios you currently have in your vehical? Are you transmitting on any of the other radios? Is there a scanner in the vehical? Are you going to use the second VHF radio to transmit AT ALL?

With the info you have given the answer is NO.

If you provide more detail we MAY be able to come up with a workable solution.

 

[BirkenVogt]

The 7180 is a very capable radio. Just one of them with all the proper scan settings and programming ought to be enough to do whatever he wants it to do.

Wait a minute, we seem to be assuming some things here..

Nick,

What is the exact usage of these radios? Do you do, or plan on doing, any transmitting with these radios, or are the for receive only?
-if it is for receive only, a simple splitter will work fine, however you will never be able to transmit without destroying the other radio.
-if you do want to transmit, then you are pretty much out of luck.

If you plan on transmitting, then it would be worth looking at what other antennas and radios you have to see what can be combined. If you have radios on other bands, then there could be the possibility that you could install a dual band antenna and get what you need.

If you decide to install two dedicated VHF radio antennas, then you need to put a lot of spacing between your antennas if you are going to transmit. Even without a direct connection, having two separate antennas can induce enough energy into the other radios to damage the receiver.

 

[sragen]

Does anyone know or can lead me in the right direction. For a vhf/vhf antenna adaptor. So I can hook 2 mobile radios up to 1 antenna. Already have 3 antennas and don't really want a 4th antenna plus this radio won't be used alot.

Thanks

Is the 3rd antenna for a radio on a different band, scanner, good time radio?

 

[prcguy]

As everyone had mentioned its difficult to connect two radios in the same band to one antenna due to the transmitter of one radio being applied to the receiver of the other radio. An expensive VHF combiner would would work but it introduces some loss and their big and require tuning.

If you only need to operate one radio at a time Shakespeare makes an auto radio switch for VHF that senses transmit power from one radio and switches the antenna to only that radio. Key up the other radio and it then switches to that one. Look up a Shakespeare model AS-2.
prcguy

 

[Rt169Radio]

As everyone had mentioned its difficult to connect two radios in the same band to one antenna due to the transmitter of one radio being applied to the receiver of the other radio. An expensive VHF combiner would would work but it introduces some loss and their big and require tuning.

If you only need to operate one radio at a time Shakespeare makes an auto radio switch for VHF that senses transmit power from one radio and switches the antenna to only that radio. Key up the other radio and it then switches to that one. Look up a Shakespeare model AS-2.
prcguy

I believe the AS-2 can go up to 600MHz, but am not entirely sure.