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Multiple Antennas and One Radio.

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HarryWilly

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What is the best way to have the connections of multiple, single band antennas, to a radio such as an FT-7800R which has a single connection for two bands. Is it even possible?

Oh and please avoid the "just go buy a dual band antenna" comments. Those usually have problems on one or the other band and are not the same gain... I know some people don't care, I don't either, just wanted to know... see if it helps performance at all
 

HarryWilly

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Now I feel like an idiot... Whoops... thanks for the help and if admins, can delete/lock this, it would be helpful
 

mjthomas59

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I understand the concept when it comes to receiving... however you lose me when it comes to transmitting. Can a duplexer prevent you from transmitting on the wrong antenna? It seems like you would end up with frying your radio by transmitting on 2 different antennas at the same time, one being designed for the band and the other one not.

Can someone help clarify that for me? Thanks
 
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N_Jay

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I understand the concept when it comes to receiving... however you lose me when it comes to transmitting. Can a duplexer prevent you from transmitting on the wrong antenna? It seems like you would end up with frying your radio by transmitting on 2 different antennas at the same time, one being designed for the band and the other one not.

Can someone help clarify that for me? Thanks

I properly designed system with a duplexer "steers" the signal based on frequency, so it should work, but the losses are likely to be greater then the minor losses you seem to be concerned with due to using a dual band antenna.

What 2 antennas are you planning on using?
 

jim202

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First of all this is not a flame or trying to put you down. With that said, having been in the radio
service and engineering field for well over 40 years, I find your statement a little of a surprise
without you defining a little more clearer just what your issue is.

Today, there are some very fine multi band antennas on the market. Many of them do have some
compromise on functionality and gain. Why are you so concerned with the gain being the same
on each band? From running mobile radios in my vehicles for about the same duration as I have
been in this type of work, there is not too many antennas that I haven't tried. I tend to end up
with a simple 1/4 antenna in the long run for most of my antennas.

When I do have a dual band radio, like on the ham frequencies, I am forced to use one of the
multi band antennas. Get use to the limitations of physics and antenna design. Bottom line is
if you don't like the dual band or tri band antennas, no one is telling you that you have to use
them.

You sound as if there will never be an antenna that will suit you likings and desires. So be it
and live with what the antenna engineers have supplied to the market for the rest of us radio
users.

Jim



What is the best way to have the connections of multiple, single band antennas, to a radio such as an FT-7800R which has a single connection for two bands. Is it even possible?

Oh and please avoid the "just go buy a dual band antenna" comments. Those usually have problems on one or the other band and are not the same gain... I know some people don't care, I don't either, just wanted to know... see if it helps performance at all
 

HarryWilly

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Oh I know there are good multi band antennas. One of the issues though is they have compromises. If you want a 1/4 length UHF, the VHF is likely not to be as good. Plus I was going through options due to height restrictions of my vehicle because I wanted to mount stuff to the roof, but the smaller dual banders seem like they do not perform nearly as well as anything with longer whips. Finally, it makes it easier because I do not want to have to go through the installation process more than once, but I am contemplating a 900MHz unit.
 

N1BHH

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Try a duplexer like you find here: http://www.universal-radio.com/catalog/hamantm/cduplex.html
I have used a duplexer to run two radios (one VHF and one UHF) on a dual band mobile antenna. I have also used a dual band radio with two antennas (one VHF and one UHF) and had good results. One of the ham band mobiles (IC-2820) has two antenna connections for diversity reception, assuming both are dual band antennas.
 

HarryWilly

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The thing though is diversity doesn't work unless you have some way of processing the signals. I was hoping that using the diamond UHF/VHF and 800Mhz duplexer would help my issues with very poor reception in the 800Mhz band. I use a Comtelco triband antenna right now.
 
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