I was going to guess Dielectric, looks too new to be an RCA.
If it *is* RCA, and if it *is* old enough to have PCB's in the reject load,
then it's probably all 51.5 ohm plumbing, not 50 ohms like the rest of the
RF world.
--- Jeff WN3A
> -----Original Message-----
> From: [email protected]
> [mailto:[email protected]] On Behalf Of Ralph S. Turk
> Sent: Thursday, August 12, 2010 2:59 PM
> To: [email protected]
> Subject: Re: [Repeater-Builder] Dielectric diplexer
>
>
>
> 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" <[email protected]>
> To: [email protected]
> 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 <[email protected]>
> To: [email protected]
> 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
> >
> >
> >
>
>
>
>
>
