[Repeater-Builder] Re: Piston Trimmer Voltage Rating

[Tim]

Thanks for the link Skip - I had gone to their
site, but didn't see the stuff under 'clearance'.

These are the caps that the original article used.

Tim

[Repeater-Builder] Re: Piston Trimmer Voltage Rating

[skipp025]

 Instead of piston trimmers you might want to try ARCO 
 padders (postage stamp size that can tolerate higher levels 
 of rf current) or small air variable capacitors. I have 
 nfound both at reasonable prices at this site: 

A generic statement that has merit in this subject 

Q is everything and the Q of an Arco cap (padder) is probably 
no where near as good as a decent piston cap.  

Ebay provides the occasional deal on nice piston caps.  If you're 
not at a critical current location, the A49 piston caps in the 
following sale ad work for some applications. 

http://www.hamtronics.com/sale.htm 

s. 

 http://www.danssmallpartsandkits.net/
 
 73 and aloha, Eric KH6CQ
 
 --- On Sun, 6/27/10, Tim tahr...@... wrote:
 
 From: Tim tahr...@...
 Subject: [Repeater-Builder] Piston Trimmer Voltage Rating
 To: Repeater-Builder@yahoogroups.com
 Date: Sunday, June 27, 2010, 11:18 AM
 
 
 
 
 
 
 
  
 
 
 
   
 
 
 
   
   
   Hi folks,
 
 
 
 Am just finishing up the 6 meter heliax duplexer project,
 
 and am getting some pretty good numbers.  (3 'cans' on
 
 each side, 90dB notch  about 1.2dB 'pass' attenuation)..
 
 
 
 Anyhow, I used some Johanson piston trimmers that I had,
 
 but evidently they are a bit shy on the working voltage
 
 rating, as the one closest to the transmitter (80 w, @53.15)
 
 didn't quite cut the mustard!  A nice arc hole in the piston.
 
 
 
 Anyhow, was wondering what the working voltage is for
 
 these guys.
 
 
 
 Guess I need to look around for some substitutes.
 
 
 
 Thanks,
 
 
 
 Tim W5FN
 
 Utopia, TX

Re: [Repeater-Builder] Re: Piston Trimmer Voltage Rating

[DCFluX]

1/4 super flex makes a pretty decent gimmick capacitor.

On Sun, Jun 27, 2010 at 10:16 PM, skipp025 skipp...@yahoo.com wrote:


 Instead of piston trimmers you might want to try ARCO
 padders (postage stamp size that can tolerate higher levels
 of rf current) or small air variable capacitors. I have
 nfound both at reasonable prices at this site:

 A generic statement that has merit in this subject

 Q is everything and the Q of an Arco cap (padder) is probably
 no where near as good as a decent piston cap.

 Ebay provides the occasional deal on nice piston caps.  If you're
 not at a critical current location, the A49 piston caps in the
 following sale ad work for some applications.

 http://www.hamtronics.com/sale.htm

 s.

 http://www.danssmallpartsandkits.net/

 73 and aloha, Eric KH6CQ

 --- On Sun, 6/27/10, Tim tahr...@... wrote:

 From: Tim tahr...@...
 Subject: [Repeater-Builder] Piston Trimmer Voltage Rating
 To: Repeater-Builder@yahoogroups.com
 Date: Sunday, June 27, 2010, 11:18 AM







 Â









       Hi folks,



 Am just finishing up the 6 meter heliax duplexer project,

 and am getting some pretty good numbers.  (3 'cans' on

 each side, 90dB notch  about 1.2dB 'pass' attenuation)..



 Anyhow, I used some Johanson piston trimmers that I had,

 but evidently they are a bit shy on the working voltage

 rating, as the one closest to the transmitter (80 w, @53.15)

 didn't quite cut the mustard!  A nice arc hole in the piston.



 Anyhow, was wondering what the working voltage is for

 these guys.



 Guess I need to look around for some substitutes.



 Thanks,



 Tim W5FN

 Utopia, TX





 



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