Nate, For these caps to be shorted, someone at one time probably attempted to tune the diplexer with RF power applied, a BIG NO - NO.
The actual value of the cap is not real critical since it is variable anyway. What is important is that it be of pretty much the same physical type. I replaced mine with Johanson 5401 piston capacitors, the value of these is 1-14pf with a "Q" of about 3000 at 200 mhz. I got ten of them on EBAY for for about $15 plus shipping from Norway, about another $5 bucks. Go to EBAY and do a general search for Piston Trimmers or Capacitors and you will probably find what you need, They even give you a photo so you know what you are looking for.... Good luck! Gary - W5GNB --- In Repeater-Builder@yahoogroups.com, "Nate Duehr" <[EMAIL PROTECTED]> wrote: > > On 3/25/07, kb5vjy <[EMAIL PROTECTED]> wrote: > > Greetings, > > > > I have a set of DB-4075's that I am having a problem tuning. One > > of the filters won't notch anything at all out so I checked the little > > tuning cap on top and found that it was bad. It looked as though it > > was shorted out and melted(thus the tuning problem.) Does anyone have > > any idea of the value that cap would be or where I could find an close > > match? Thanks and 73 de Joe KB5VJY - West Monroe, LA > > I'm interested in the answer too, since I have a 4075 here that's also > behaving strangely... I think it's a 4075, anyway... can't remember, > and it's not here where I am right now... but loaned it back to the > people that originally acquired it, and they found it acted strangely > too, and used a spare Wacom they had, instead... now I'm really > curious what's "up" with it. > > Nate WY0X >
