At 10:06 AM 10/13/2008, Daron Wilson wrote: >I've rebuilt a pile of those duplexers, it is just bench work to >disassemble them, clean them and reassemble. Most of my rack >mounted stuff is black, and I like that, so I usually spray paint >the components of the cans when I have them apart with black gloss >spray paint, taping up the holes so no paint gets inside the >can. Then I buff and clean the inside of the cans as I reassemble >them. I've not ever noticed any change in response after rattle can >painting the outside of the cans. > >On the same product, does anyone know the specific difference in the >5 mHz spread and the 3 mHz spread versions of these duplexers? I >picked one up and the notch appears to be only tunable about 3 megs >from the pass frequency, is this a simple change in the notch loop >or something? I'd like to use it on a 5 mHz split.
<----I agree about the painting. I don't see where you can get into any problems as long as the connectors, tuning shaft and loop slides (and slots in the cavity walls) are masked off. As for the 3 megs thing, remember a few years back where I had problems with a newly acquired T1504A that wouldn't quite make the 5 meg notch? It turned out that someone had repaired a notch loop and left a very large solder fillet that effectively made the loop electrically shorter. I cleaned up the eccess solder and voila! 5 meg notch once more. So my thought is that the coupling and notch loops are longer on a 5 meg split one than a 3 meg. Ken ------------------------------------------------------------------------------ President and CTO - Arcom Communications Makers of repeater controllers and accessories. http://www.arcomcontrollers.com/ Authorized Dealers for Kenwood and Telewave and we offer complete repeater packages! AH6LE/R - IRLP Node 3000 http://www.irlp.net "We don't just make 'em. We use 'em!"
