Filter looks like an old GE setup. If so the dummy load more than likely is loaded with PCB and is tuned for about 70 mhz. Same would be true for a RCA. Color of the load is what tips me off. Most of the older loads were not wide bandwidth. Ralph ----- Original Message ----- From: "Bill Isom" <bil.i...@yahoo.com> To: Repeater-Builder@yahoogroups.com Sent: Thursday, August 12, 2010 11:41:30 AM Subject: Re: [Repeater-Builder] Dielectric diplexer
I have a picture of the unit. It is on a roll around frame, fed with 3" hardline, and has four cavities. The cavities look to be copper, about 10" dia and a little over 2' tall. Two Bird looking wattmeters are in the photo and there is a massive looking dummy load. Any ideas about converting the 3" hardline to something usable? I figure if I can't get it to 220, those copper cavities will make one heck of a still. 73 Bill N4XIR From: Glenn Little WB4UIV <glennmaill...@bellsouth.net> To: Repeater-Builder@yahoogroups.com Sent: Wed, August 11, 2010 10:00:04 PM Subject: Re: [Repeater-Builder] Dielectric diplexer I disassembled one for channel 4. The cavities were about 3 feet in diameter. I salvaged the plungers for the INVAR rods. The diplexer was mounted on a huge roll around aluminum frame. The cavities were connected with 3 inch ridge line. There were four cavities, two fir video and two for audio. There was a 5 KW reject load attached as well as two power meters for 3 in line. The slugs for these look like Bird 43 slugs and will fit into a Bird 43 meter, however, the coupling is wrong for a standard Bird line section, so, the slugs read very low, ie, 500 Watts pins the meter with a 25KW slug installed. Have you seen what you are getting? A friend of mine made fuel tanks for his generator from the channel 4 cavities. I suspect that you could get the cavities to 220 MHz, At 25KW, I suspect that your cavities are also fed with 3 inch rigid line. 73 Glenn WB4UIV At 07:37 PM 8/11/2010, you wrote: >I have just been told I am about to receive a dielectric brand >diplexer rated at 25000 watts on 191 Mhz from a analog TV >station. I feel a little bit like the dog that catches the car he >is chasing. Now that I have it, what can I do with it? Any >ideas? Can it go to 220? Does anyone have any experience with these? >Thanks >Bill N4XIR > > > >------------------------------------ > > > >Yahoo! Groups Links > > >
