Ken, Assuming that the suspect cavity is not damaged or dented, the only cause I can think of for the symptom you describe is a poor contact at the grounded (adjustment) end of the loop. A lot of crud, not to mention spiders, can enter the cavity through the open slots. I'm pretty certain that a good cleaning and burnishing of the contact surfaces will cure the problem. Just remove the four screws on the connector and the adjustment knob of the loop and lift out the loop assembly. A coarse typewriter eraser (remember them?) is ideal for cleaning such surfaces without scratching the plating. A Gold Guard pen is another tool worth using.
73, Eric Lemmon WB6FLY Ken Arck wrote: > > Hi kids > > I'm tuning up a T1504A, which has the 430 - 470 cable set on it. Everything > looks good, except for one cavity - one of the lowpass/hi reject ones. I > can't seem to get a very good null on it, regardless of the loop position. > As a matter of fact, the reject seems to be "getting better" when it runs > up against the outside edge of the adjustment slot. But I never find a > definate point. The other 3 cavities are great - a nice, sharp, deep null, > just about centered in the slot. > > Anyone have any ideas what I should be looking for? > > Ken > ------------------------------------------------------------------------------ > President and CTO - Arcom Communications > Makers of state-of-the-art repeater controllers and accessories. > http://www.ah6le.net/arcom/index.html > Be sure to see our products at this year's Dayton Hamvention! > Repeater Builders spaces 707 through 710 > AH6LE/R - IRLP Node 3000 > http://www.irlp.net > > > Yahoo! Groups Links > > > > Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
