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

   Home   Help Search  
Pages: [1]   Go Down
  Print  
Author Topic: SB-200 Parasitic Suppressor  (Read 2643 times)
K8AXW
Member

Posts: 3685




Ignore
« on: June 18, 2012, 10:14:10 AM »

The question, "How do I make new parasitic suppressors for my SB-200 amplifier" has been posted here on the eHam.com Amplifier forum several times.  It usually leads to a lengthy discussion and I've often felt the answers were still somewhat obscure to many.

So I dug out my old SB-200 suppressors and took a photo of them and posted them on Photobucket.com.  Follow this link and the answer will be answered once and for all.

http://s1171.photobucket.com/albums/r553/KarlAibling/Ham%20Radio/?action=view&current=ParasiticSuppressorSB-200.jpg

K8AXW
Logged
W1QJ
Member

Posts: 1443




Ignore
« Reply #1 on: June 18, 2012, 04:54:48 PM »

You can still get a 47 ohm 2 watt resistors for about $6.00(each) shipped to your door and it will still be an old carbon resistor.  The question should be asked...How do I build a new BETTER suppressor using today's available resistors.  The answer would be to get hold of 4 100 ohm 2 watt OX or OY type resistors (2 for each suppressor) parallel them and put them across a similar inductor made of #14 wire with same turns and diameter as the originals.  Leave the resistors outside the coil.
Logged
K8AXW
Member

Posts: 3685




Ignore
« Reply #2 on: June 18, 2012, 08:38:30 PM »

QJ:  Exactly!  But I was just answering the usual question about the number of turns on the coil. 
Logged
N2CJ
Member

Posts: 197


WWW

Ignore
« Reply #3 on: June 19, 2012, 06:44:20 AM »

Surplus Sales of Nebraska (COL) 547-3654-002 - 11.75 ea.

They work fine in my SB-200.

IMHO the subject has pretty much been beaten to death.
Logged
W1QJ
Member

Posts: 1443




Ignore
« Reply #4 on: June 19, 2012, 08:55:41 AM »

QJ:  Exactly!  But I was just answering the usual question about the number of turns on the coil. 
EXACTY!  I assume many looked at the photo at your link.  The number of turns is obvious and the diameter of the coils is obvious too.
Logged
K8AXW
Member

Posts: 3685




Ignore
« Reply #5 on: June 19, 2012, 10:03:01 AM »

CJ:  The subject has been beaten pretty bad, no question.  However, whenever this question was brought up it started a flurry of suggestions and opinions that seemed to never end with all questions completely answered.

While it has been unequivocally established the new resistors should be 47-50 ohms  ceramic composition, OX or OY type depending on power handling capability.  (OY= 2W  OX=1W)

I plan to use two 100ohm OY Ohmite Ceramic Composition resistors in parallel as QJ suggested.  (The ones I bought are Mouser Electronics part number 588-OY-100E)

What has never been firmly established is the number of turns use for the coils.  This is the total purpose of the photo I posted on Photobucket.  From now on if anyone asks the question "How do I make new SB-200 parasitic suppressors," they're not researching the question first!

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!