RE: [Repeater-Builder] Home-made ressonant cavities?

[Mike Mullarkey]

EBAY is a great place to start.

 

Mike Mullarkey (K7PFJ)

  _  

From: Repeater-Builder@yahoogroups.com
[mailto:[EMAIL PROTECTED] On Behalf Of Alexandre Souza
Sent: Thursday, May 15, 2008 8:11 AM
To: Repeater-Builder@yahoogroups.com
Subject: [Repeater-Builder] Home-made ressonant cavities?

 


Anyone into homemade ressonant cavities? These are hellish expensive in 
Brazil, I'd like to give a try on building one. Anyone experienced? Tips you

want to share?

Thanks
Alexandre Souza
PU1BZZ 

 

Re: [Repeater-Builder] Home-made ressonant cavities?

[Alexandre Souza]

> EBAY is a great place to start.

Transport something as big as a duplexer to Brazil and fight the 
customs? Nah...better build it here, it cannot be so esoteric that I cannot 
build here :o)

RE: [Repeater-Builder] Home-made ressonant cavities?

[John Transue]

Alexandre,

  I made some cavities for a six-meter duplexer. The cavities are notch
filters. There is a web site on the subject. Just do a Google search on
"six meter duplexer".

John

 

-Original Message-
From: Repeater-Builder@yahoogroups.com
[mailto:[EMAIL PROTECTED] On Behalf Of Alexandre Souza
Sent: Thursday, May 15, 2008 10:11 AM
To: Repeater-Builder@yahoogroups.com
Subject: [Repeater-Builder] Home-made ressonant cavities?

 


Anyone into homemade ressonant cavities? These are hellish expensive in 
Brazil, I'd like to give a try on building one. Anyone experienced? Tips
you 
want to share?

Thanks
Alexandre Souza
PU1BZZ 

 

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Re: [Repeater-Builder] Home-made ressonant cavities?

[Wayne]

  I have not tried building one myself, but there were numerous plans on  
the internet a couple of years back. I had thought to try making some  
using the large coffee cans.
  There were plans showing some made using PC board, square instead of  
round.
  You don't mention what band you want, but 2 meters and 70 centimeters  
should be fairly easy to make.
  I have found a number of duplexers for the 70 centimeter band on Ebay at  
various times. Some fairly reasonable. I have 3 sets that I am not yet  
using, though 2 of them would be for not more than about 50 watts, the  
other is a Micor 2 can unit, band pass, band reject.

  just thought, I recently saw one person selling parts for some duplexers,  
like the loops and connectors. But you need to make an adjustable sleeve  
setup to tune the cavity itself.
  Part of it was using finger stock.
  Note that some of the commercial units use a special metal for the tuning  
rods, that are supposed to be more stable than common parts.
  For 70 centimeters, one source would be old type mobile phones. As I  
said, lower power, not more than about 50 watts to the TX cans. One of  
mine was removed from an old motorla full duplex mobile phone. The rest of  
the unit was basically junk.
  It uses BNC connectors, okay at lower powers. best to use N connectors if  
you can, especially above 2 meters.
  Anyway, do some searching for duplexers, especially home brew.
  The data I have is on my lap top and not readily available right now,  
plus some on the drive in/from another computer not in use right now.

 is one for the 440 band.
  There are others, but some searching will be necessary.
  YMMV

  Wayne WA2YNE
  Imperial, Tejas


On Thu, 15 May 2008 09:11:27 -0500, Alexandre Souza  
<[EMAIL PROTECTED]> wrote:

>
> Anyone into homemade ressonant cavities? These are hellish expensive  
> in
> Brazil, I'd like to give a try on building one. Anyone experienced? Tips  
> you
> want to share?
>
> Thanks
> Alexandre Souza
> PU1BZZ
>



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RE: [Repeater-Builder] Home-made ressonant cavities?

[Barry C']

Google Heliax cavities and of course if you have access to a modest lathe you 
can turn your own quite cheaply 

To: Repeater-Builder@yahoogroups.com
From: [EMAIL PROTECTED]
Date: Thu, 15 May 2008 11:11:27 -0300
Subject: [Repeater-Builder] Home-made ressonant cavities?






















Anyone into homemade ressonant cavities? These are hellish expensive in 

Brazil, I'd like to give a try on building one. Anyone experienced? Tips you 

want to share?



Thanks

Alexandre Souza

PU1BZZ 




  



















_
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RE: [Repeater-Builder] Home-made ressonant cavities?

[KF4TNP]

What freq are you looking for and how many cavities?
 
  _  

From: Repeater-Builder@yahoogroups.com
[mailto:[EMAIL PROTECTED] On Behalf Of Barry C'
Sent: Thursday, May 15, 2008 5:22 PM
To: repeater-builder@yahoogroups.com
Subject: RE: [Repeater-Builder] Home-made ressonant cavities?
 
Google Heliax cavities and of course if you have access to a modest lathe
you can turn your own quite cheaply 

  _  

To: Repeater-Builder@yahoogroups.com
From: [EMAIL PROTECTED]
Date: Thu, 15 May 2008 11:11:27 -0300
Subject: [Repeater-Builder] Home-made ressonant cavities?

Anyone into homemade ressonant cavities? These are hellish expensive in 
Brazil, I'd like to give a try on building one. Anyone experienced? Tips you

want to share?

Thanks
Alexandre Souza
PU1BZZ 


 
  _  

Click here Search for local singles online @ Lavalife.
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Re: [Repeater-Builder] Home-made ressonant cavities?

[Kevin Custer]

Alexandre Souza wrote:
> Anyone into homemade ressonant cavities? These are hellish expensive in 
> Brazil, I'd like to give a try on building one. Anyone experienced? Tips you 
> want to share?


Things to ponder



 >http://www.repeater-builder.com/projects/2mduplexer.html>





Good luck
Kevin

Re: [Repeater-Builder] Home-made ressonant cavities?

[Robert Pease]

The repeaterbuilder website has a old QST article on building a set of 2 meter 
duplexers.  

Sent by Good Messaging (www.good.com)


 -Original Message-
From:   Alexandre Souza [mailto:[EMAIL PROTECTED]
Sent:   Thursday, May 15, 2008 11:40 AM Eastern Standard Time
To: Repeater-Builder@yahoogroups.com
Subject:Re: [Repeater-Builder] Home-made ressonant cavities?

> EBAY is a great place to start.

Transport something as big as a duplexer to Brazil and fight the 
customs? Nah...better build it here, it cannot be so esoteric that I cannot 
build here :o)


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