John,

In the cases I have seen, an "Iso-Tee" is constructed by removing the center 
pin in the offset side of a UHF "T" connector, grinding it down until it is 
flat with the insulator surface (add a notch so you can re-insert with a 
screwdriver) and reinsert the pin into the connector.  This provides for an 
indirect connection for testing purposes.

The link below describes the theory/practice behind its design and use, 
although the author uses an insulator sleeve around the center pin of his 
connector rather than the design I am familiar with.

http://www.conknet.com/~b_mobile/NoiseStuff.html 

This article describes the design I am familiar with:

http://mrtmag.com/mag/radio_rf_samplers_directional/ 

If you have a Bird wattmeter, you can construct one for use with your meter:

http://www.repeater-builder.com/projects/bird43sampler.html 

Hope this helps!
Mark - N9WYS

-----Original Message-----
>From: John Transue <[EMAIL PROTECTED]>
>Date: 2008/07/09 Wed AM 10:06:35 EDT
>To: [email protected]
>Subject: RE: [Repeater-Builder] Re: New Repeater Desense Problems

>So, please, someone tell me, what is an iso tee/sampler slug? How is the 
>equipmenthooked up for the desense test?
> 
>John

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