VHF Antenna Splitter

[k9gunner]

At one time, I saw a splitter where you could hook 2 VHF mobiles into one antenna with a splitter. First, is this safe? I understand I can only TX on one at a time, which is ok. Also where can I get one?

 

[Comint]

At one time, I saw a splitter where you could hook 2 VHF mobiles into one antenna with a splitter. First, is this safe? I understand I can only TX on one at a time, which is ok.

It is actually called an RF Combiner, and can have multiple inputs - 8, 12, 16 are not uncommon - and is used by large organisations such as Defence Forces, Air traffic Control Facilities, and Cellphone Operators.

Also where can I get one?

Lots of places. Google.

 

[jim202]

I don't know of any "splitter" that will allow you to operate 2 mobiles on the same band
and on the same antenna. Your going to burn out something before it's over.

On another note, there are a couple of companies that make multi band devices that
allow you to connect a VHF and a UHF or a VHF and a UHF and an 800 MHz radios
to the same antenna. These devices have band pass filters in them to allow this
to work. In fact they are rated for up to 100 watt transmitters. Have had to use
a number of these in mobile command vehicles when additional radios were added
and there was no more roof antenna locations that could be used.

If you go back to the same band ( VHF ) and try to connect 2 mobile radios to the
same antenna, your going to need a combiner system. This will get big, heavy
and expensive real fast. The construction will probably have a number of filter
cans or cavities connected in a system to prevent the 2 mobiles from causing a
problem between each other. Major problem with this kind of device, is that
it is very frequency dependent. You can not change frequencies and expect it
to still work. In other words, the system is designed for only the frequencies
that it was built for. No changing channels.

Jim

At one time, I saw a splitter where you could hook 2 VHF mobiles into one antenna with a splitter. First, is this safe? I understand I can only TX on one at a time, which is ok. Also where can I get one?

 

[ind224]

Is this what you mean? Not mine just wondering if this is what you meant.
http://cgi.ebay.com/DIAMOND-MX-72D-...95QQihZ019QQcategoryZ1502QQrdZ1QQcmdZViewItem

 

[k9gunner]

I don't know of any "splitter" that will allow you to operate 2 mobiles on the same band
and on the same antenna. Your going to burn out something before it's over.

On another note, there are a couple of companies that make multi band devices that
allow you to connect a VHF and a UHF or a VHF and a UHF and an 800 MHz radios
to the same antenna. These devices have band pass filters in them to allow this
to work. In fact they are rated for up to 100 watt transmitters. Have had to use
a number of these in mobile command vehicles when additional radios were added
and there was no more roof antenna locations that could be used.

If you go back to the same band ( VHF ) and try to connect 2 mobile radios to the
same antenna, your going to need a combiner system. This will get big, heavy
and expensive real fast. The construction will probably have a number of filter
cans or cavities connected in a system to prevent the 2 mobiles from causing a
problem between each other. Major problem with this kind of device, is that
it is very frequency dependent. You can not change frequencies and expect it
to still work. In other words, the system is designed for only the frequencies
that it was built for. No changing channels.

Jim

Ok thanks, that is what I was looking for. I see now it is a bad idea, and not as simple as I thought. I have since just ran a secons antenna.

 

[k9gunner]

Is this what you mean? Not mine just wondering if this is what you meant.
http://cgi.ebay.com/DIAMOND-MX-72D-...95QQihZ019QQcategoryZ1502QQrdZ1QQcmdZViewItem

Yes, that is very similiar to what I saw.