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VHF Quantar issue. Help!!

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emtunderwood

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Dec 8, 2007
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I have a motorola quantar VHF 125W currently set at 90W and is functioning well. We are not using a duplexer at this time. The transmit is wonderful and has excellent range. However, the problem is our receive. With portable radios we may have 2-3 miles of range and then we can only hear the portables key up and no audio. With high power mobiles we have audio but is very weak and distant sounding. I get no alarms or abnormal warnings or errors in the log.. Is there a simple solution to this? Or is something fried? Also, we have swept the antennas and show no errors at all and only very minimal loss on the tx and rx antennas. Anyone have a solution?
 

KevinC

Big Dog...celebrating 10 years of abuse!
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Desense??? What is the separation between the TX and RX antenns?
 

RBMTS

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You need to install some cavity filters into your system. KevinC said it all - desense! Here is a simple test: shut down the transmitter and listen to the input frequency on the Quantar for the portables and mobiles. You will hear them loud and clear. The TX is knocking out your RX with the antennas that close.
 
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emtunderwood

Member
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Dec 8, 2007
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Duplexers will be installed on monday. they had to be removed due to space and re-tuning issues. We couldn't knock the FD out completely. and our old site we have landowner issues and cannot reaccess the site only to remove the equipment.
 

N4DES

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Duplexers will be installed on monday. they had to be removed due to space and re-tuning issues. We couldn't knock the FD out completely. and our old site we have landowner issues and cannot reaccess the site only to remove the equipment.

Time to find a new home for the repeater....
 

kayn1n32008

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You will never get it to work properly with out a crap load of filtering having the antennas horizontally 12’ apart.


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Project25_MASTR

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You will never get it to work properly with out a crap load of filtering having the antennas horizontally 12’ apart.


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You need to take a look at this page on RepeaterBuilder.com:



Isolation between the repeater receiver and RF sources



This is a good 18 minutes of ones life for learning about isolation.

*Warning, 1991 era video but still relevant *
[youtube]j8QpV5ThCDY[/youtube]


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