Bill,
Looks like those cavities will bolt together end to end.
All four would make a nice single 6m cavity.
The 3 1/8 elbows look to be good quality and are always in demand for high
power FM radio work. Keep these and their inner bullets.
The 3dB couplers look to be machined from a single block, so theycould be
converted to stripline filters for 220 if you can obtain some 3 1/8" to N type
adaptors.
Ian
G8PWE
----- Original Message -----
From: Bill Isom
To: Repeater-Builder@yahoogroups.com
Sent: Thursday, August 12, 2010 7:41 PM
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
>
>
>
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