Re: [Repeater-Builder] Another unknown duplexer

[Paul Holm]

I didn't measure the wall thickness.  They are relatively thin and 
lightweight, while the flange is thick.  Definitely aluminum or some other 
very lightweight metal.


- Original Message - 
From: "Joe"  I've never seen a set like that, but the cans look like they are made
> out of rigid coaxial line, the kind used for high power FM and TV
> broadcast stations.  I'm guessing that is what it is made out of because
> of the flange on the top.  I'm curious, what is the thickness of the
> outer walls on the cans?  Rigid coax was thick walled compared to
> regular hardline.
>
> Joe
>

>
>
>
>
>
> 

Re: [Repeater-Builder] Another unknown duplexer

[Joe]

I've never seen a set like that, but the cans look like they are made 
out of rigid coaxial line, the kind used for high power FM and TV 
broadcast stations.  I'm guessing that is what it is made out of because 
of the flange on the top.  I'm curious, what is the thickness of the 
outer walls on the cans?  Rigid coax was thick walled compared to 
regular hardline.

Joe

Paul Holm wrote:
>
>
> This set of cans has been in our club since before I was involved.  
> None of us seem to recall where this thing came from or who made it.  
> Does anyone recognize this one?
>  
> 
>  

Re: [Repeater-Builder] Another unknown duplexer

[N9LLO]

Don't know where they came from but our club has one just like it on a 100w 
 MSF5000.
Works very well
 
Chris
N9LLO
 
 
In a message dated 11/25/2009 9:52:05 A.M. Eastern Standard Time,  
p...@chargertech.com writes:

 
 
 
This set of cans has been in our club since  before I was involved.  None 
of us seem to recall where this thing came  from or who made it.  Does anyone 
recognize this one?
 
<_http://groups.http://grohttp://groups.http://groups.http://groups.http://groups.yahoo.com/group/Repeater-Builder/photos/album/700689718/pic/list)
 >
 
The cavities are about 4" in diameter and are 23"  long.  The top plate is 
heavy brass and is made to fit 6 spaces in a 19"  rack.  At first glance it 
almost looks like it is homebrewed.  The  cavities are not silver plated.  
But some things make it appear to be of  commercial origin.  The aluminum 
cavities have very neatly welded top  mounting flanges and bottom endcaps, and 
are anodized/alodized.  Also,  the tuning rod lock nut assemblies appear to 
be custom fasteners, and the  center elements have nice fingerstock at the 
bottom.
 
We used this on a temporary, low-power machine a  few years ago.  Now, we'd 
like to really go through it and tune it up for  a another machine.  While 
I had it here, I thought I'd try to figure out  where it came from.  Thanks.
 
 
73  Paul - KC0HST
 
 

Re: [Repeater-Builder] Another unknown duplexer

[no6b]

At 11/25/2009 06:50, you wrote:


>This set of cans has been in our club since before I was involved.  None 
>of us seem to recall where this thing came from or who made it.  Does 
>anyone recognize this one?
>
><http://groups.yahoo.com/group/Repeater-Builder/photos/album/700689718/pic/list>
>

I've worked with a set of those once.  I was told they were made by "North 
Shore".  Never could get very good isolation out of them.  We ended up 
chopping them up into individual cans & converting them to pass only, & 
converting some of those to 220 by cutting down the center tube - wish I 
had some of those now.

Bob NO6B

RE: [Repeater-Builder] Another unknown duplexer

[k7pfj]

Well I haven't seen these cavities in some time. They look like an early
version of the Fred Voight series of filters. They seemed to work with a bit
more loss than your commercial Sinclair 6 can Bp/Br cans. 

 

Mike

 

 

Mike Mullarkey K7PFJ

 

 

  _  

From: Repeater-Builder@yahoogroups.com
[mailto:repeater-buil...@yahoogroups.com] On Behalf Of Paul Holm
Sent: Wednesday, November 25, 2009 7:50 AM
To: Repeater Builder Reflector
Subject: [Repeater-Builder] Another unknown duplexer

 

  

This set of cans has been in our club since before I was involved.  None of
us seem to recall where this thing came from or who made it.  Does anyone
recognize this one?

 

<http://groups.
<http://groups.yahoo.com/group/Repeater-Builder/photos/album/700689718/pic/l
ist> yahoo.com/group/Repeater-Builder/photos/album/700689718/pic/list>

 

The cavities are about 4" in diameter and are 23" long.  The top plate is
heavy brass and is made to fit 6 spaces in a 19" rack.  At first glance it
almost looks like it is homebrewed.  The cavities are not silver plated.
But some things make it appear to be of commercial origin.  The aluminum
cavities have very neatly welded top mounting flanges and bottom endcaps,
and are anodized/alodized.  Also, the tuning rod lock nut assemblies appear
to be custom fasteners, and the center elements have nice fingerstock at the
bottom.

 

We used this on a temporary, low-power machine a few years ago.  Now, we'd
like to really go through it and tune it up for a another machine.  While I
had it here, I thought I'd try to figure out where it came from.  Thanks.

 

 

73  Paul - KC0HST

 

 



No virus found in this incoming message.
Checked by AVG - www.avg.com
Version: 8.5.425 / Virus Database: 270.14.80/2523 - Release Date: 11/24/09
07:46:00

[Repeater-Builder] Another unknown duplexer

[Paul Holm]

This set of cans has been in our club since before I was involved.  None of us 
seem to recall where this thing came from or who made it.  Does anyone 
recognize this one?



The cavities are about 4" in diameter and are 23" long.  The top plate is heavy 
brass and is made to fit 6 spaces in a 19" rack.  At first glance it almost 
looks like it is homebrewed.  The cavities are not silver plated.  But some 
things make it appear to be of commercial origin.  The aluminum cavities have 
very neatly welded top mounting flanges and bottom endcaps, and are 
anodized/alodized.  Also, the tuning rod lock nut assemblies appear to be 
custom fasteners, and the center elements have nice fingerstock at the bottom.

We used this on a temporary, low-power machine a few years ago.  Now, we'd like 
to really go through it and tune it up for a another machine.  While I had it 
here, I thought I'd try to figure out where it came from.  Thanks.


73  Paul - KC0HST