2 LPA's and a duplexer?

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JackTV

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Hey All, I have 2 LPA's (118-1000 & 225-400 MHZ) I want to try to get a little more gain on UHF air band by using my 225-400 mhz ant while still picking up the usual scanning freqs. (118-1000mhz) I would like to try a duplexer but I can't find any that work the bands that I want. Ultimutly I would like to have one that covers 30-160 mhz then 220-900 mhz.I do not want to use an amp.Lots of noise in my area.
Any ideas or recomondations let me know.

Thanx,
Jack
 

prcguy

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So Cal - Richardson, TX - Tewksbury, MA
I'm trying to make sense of your post but not having much luck. You have a 118-1000MHz antenna and a 225-400MHz antenna and you want to combine them with a diplexer so one covers 30-160MHz and the other covers 220-900MHz.

Something does not add up here.
prcguy
 

JackTV

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Joined
Mar 1, 2003
Messages
384
I'm trying to make sense of your post but not having much luck. You have a 118-1000MHz antenna and a 225-400MHz antenna and you want to combine them with a diplexer so one covers 30-160MHz and the other covers 220-900MHz.

Something does not add up here.


prcguy
I am trying to get a stronger signal on 225-400 by using the antenna cut for that freq. band.This one has a bit more gain then the 118-1000 ant.
Even though the one lpa(118-1000) does not go down to 30 mhz it will still rx it.I have state police down that low ...hence down to 30 mhz.The 160 mhz is just a number I picked close to marine band which is 156-158mhz.

Jack
 
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zz0468

QRT
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Feb 6, 2007
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Read the thread about using one scanner with multiple antennas:

http://forums.radioreference.com/an...57-running-one-scanner-multiple-antennas.html

There's a whole bunch of reasons why it's a bad idea, and very few reasons why it might work.

I managed to understand what you're trying to do. When you say the 225-400 antenna "has a bit more gain", how much more are you talking about? When you say your area has "lots of noise", what sort of noise? How do you know?

Combining two antennas will create a combined antenna pattern that's completely random. To make matters worse, the perceived gains are generally going to be lost in the inherent loss of the device doing the combining. It's just all around a bad idea.
 
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