Someone wrote:

>The current 652s (not 625s) also have the acrylic stubs on the 
>side...unless TXRX has done something to the cans I don't know about!!
>  
>

Later model 652's don't have notch stubs.  This is a change that Wacom 
made, not TXRX.  Maybe they forgot to call and inform you of that! <grin>
The picture in this (WACOM) article depicts the newer 652's without the 
stubs.  I don't know how the notch adjustment is made with the newer 
models; maybe with a variable capacitor?
http://www.repeater-builder.com/pdf/wp652.pdf

FYI:  TXRX will likely never do anything to the WACOM cans.  They aren't 
building them and really aren't doing much to support them; IMHO.
Telewave seems to want to help out the loyal Wacom folks, at least 
that's what their website says:
http://www.telewave.com/

>The rod on mine measured 5 1/4" long with the center drilled out and 
>stops 1 1/4 inches from the end...it is inserted in the side stub to 
>where it is 1/4 inch from being bottomed out inside (1 1/2 inches from 
>end of rod)
>

The dielectric rods are likely the same for all 4 places, but there are 
other differences that might be likely.

>DId you need the overall length of acrylic rod and outside conductor as 
>well?
>

On the WP-641 the *inner* conductor is a different length between sides 
even though the outer conductor is of the same length; I'd guess this to 
be true for the 220 version as well.  The inner conductor can be 
measured by inserting a small tape measure into the notch stub with the 
dielectric removed.  The length of the inner conductor is what 
determines the 'side' in which the deeper notch appears, and the 
approximate frequency about the pass.  The dielectric then tunes the 
exact frequency in which the stub produces the notch about the pass.  I 
say "deeper" because a notch actually appears on BOTH sides of the 
pass.  More on this in this article:
http://www.repeater-builder.com/rbtip/wacombpbrnotes.html

Kevin Custer







 

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