Call Search
     

New to Ham Radio?
My Profile

Community
Articles
Forums
News
Reviews
Friends Remembered
Strays
Survey Question

Operating
Contesting
DX Cluster Spots
Propagation

Resources
Calendar
Classifieds
Ham Exams
Ham Links
List Archives
News Articles
Product Reviews
QSL Managers

Site Info
eHam Help (FAQ)
Support the site
The eHam Team
Advertising Info
Vision Statement
About eHam.net



QSL Managers
     

Ham Links
     


   Home   Help Search  
Pages: [1]   Go Down
  Print  
Author Topic: Ameritron AL-572's parasitic suppressor values?  (Read 810 times)
N8CBX
Member

Posts: 51


View Profile

Ignore
« on: January 16, 2013, 09:45:22 AM »

I would like to know the component values of the AL-572 parasitic suppressor. I would to scratch build a pair for my pair of 572s
Thanks,
Jan N8CBX
Logged

Dayton Ohio - The Birthplace of Aviation
N8CBX
Member

Posts: 51


View Profile

Ignore
« Reply #1 on: January 16, 2013, 01:55:42 PM »

Here's a picture of it from W8JI's website
http://www.w8ji.com/images/Amplifier/AL811H/AL811H-parasitic-top.jpg
Jan
Logged

Dayton Ohio - The Birthplace of Aviation
WA7PRC
Member

Posts: 42


View Profile WWW

Ignore
« Reply #2 on: January 17, 2013, 12:31:15 PM »

All the AL811H parts list says is 100Ω/2W, and the photo shows them to be ±10% tolerance.  The AL572 parts list doesn't dig down to the component level for the parasitic suppressor assemblies.  The resistors need to have very little inductance, which eliminates wirewound and some film resistors. Carbon composition could be used but they don't take heat very well, and there's plenty of that at the tube anode connectors.  One expert prefers Ohmite OY (ceramic composition) resistors. You would look for pn OY101KE. Digi-Key, Mouser, Allied, and Newark all show stock on hand.

vy 73,
Bryan WA7PRC
Logged
N8CBX
Member

Posts: 51


View Profile

Ignore
« Reply #3 on: January 19, 2013, 11:26:12 AM »

Ameritron sells the whole suppressor assembly for about $37, so I'm going to do just that.
Thanks Bryan, but why doesn't one buy the "Little Devil" Ohmite type which is an original carbon resistor?
Jan
Logged

Dayton Ohio - The Birthplace of Aviation
K1ZJH
Member

Posts: 649


View Profile

Ignore
« Reply #4 on: January 19, 2013, 01:15:30 PM »

Carbons will shift in value. Many resistors in suppressor service have doubled in value. Modern carbon comps are also made differently and have more internal inductance.

Pet
Logged
Pages: [1]   Go Up
  Print  
 
Jump to:  

Powered by MySQL Powered by PHP Powered by SMF 1.1.11 | SMF © 2006-2009, Simple Machines LLC Valid XHTML 1.0! Valid CSS!