Re: [Repeater-Builder] micor desense problem

2005-08-13 Thread Kevin Custer
n3dab wrote:

Would appreciate any feed back concerning a VHF non-unified chasis 
Micor repeater.  The rcvr. is apparently being desensed by the an 
unstable PA.  Bypassing the PA eliminates the desense.  
  


Are you sure you have sufficient duplexer isolation?  If you didn't, the 
same result would happen.

Kevin Custer




 
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[Repeater-Builder] micor desense problem

2005-08-12 Thread n3dab
Would appreciate any feed back concerning a VHF non-unified chasis 
Micor repeater.  The rcvr. is apparently being desensed by the an 
unstable PA.  Bypassing the PA eliminates the desense.  

One suggestion recieved was to check /replace the Tantalum bypass caps 
in the PA   The PA is a TLD8453A.  A review of the manual and visual 
loook at the PA bd. does not indicate any Tantalum bypass caps being 
installed.  Should the bypass caps in the power supply be suspect as 
well?? I can't ID any Tantalums there either. 

Can anyone give me the Cap nos. that I should suspect of being 
defective so I can cross reference them to the manual, or any other 
suggestions re: correcting the problem short of getting a new repeater. 
Any/all help will be appreciated.

73's  Doug






 
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Re: [Repeater-Builder] micor desense problem

2005-08-12 Thread Andrew G.



The first thing I would do is change the PA out with another to make sure that it is not a duplexer/filtering problem. Also, I presume you have decent cabling between the TX and duplexer/ RX and duplexer?

Andy KC2GOW
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