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: Calibrate Diamond SX20C cross needle SWR meter  (Read 1417 times)
9W6VX
Member

Posts: 6




Ignore
« on: April 17, 2005, 09:14:39 AM »

I have a Diamond SX20C cross needle SWR which needs calibration. Both needles at rest are not at the minimum level (0).

How can I calibrate it?

Appreciate your kind replies.

Thanks.
Logged
K7KBN
Member

Posts: 2813




Ignore
« Reply #1 on: April 17, 2005, 09:22:31 AM »

I'm not familiar with that particular meter, but from the pictures available online, I'd say you will have to open it up and look at the rear of the meter movement enclosure for two small adjusting screws, which you carefully adjust for a zero pointer indication.  My Daiwa cross-needle meters all have the adjusting screws right on the front panel.
Logged

73
Pat K7KBN
CWO4 USNR Ret.
9W6VX
Member

Posts: 6




Ignore
« Reply #2 on: April 19, 2005, 03:31:50 AM »

Thanks for your reply.

Will check it out and revert back if still negative.

73 de 9W6VX
Logged
WJ7S
Member

Posts: 1




Ignore
« Reply #3 on: August 31, 2012, 11:06:10 PM »

If you open the meter there are calibration pots for the high and low power and swr but I cannot find any instructions anywhere on how to calibate
Logged
K7KBN
Member

Posts: 2813




Ignore
« Reply #4 on: August 31, 2012, 11:38:00 PM »

If you open the meter there are calibration pots for the high and low power and swr but I cannot find any instructions anywhere on how to calibate

You'll need 1:1, 2:1, 3:1 dummy loads (very close in resistance and capable of handling the transmitter power).  You'll also need an RF wattmeter that has at the very minimum a 4:1 ratio of maximum error compared with the meter you're calibrating. Meaning that if the manufacturer of your meter says it's plus or minus 10%, the standard must be plus or minus 2.5% or better.

Dummy loads and wattmeter must themselves be calibrated (otherwise you don't know what's right and what's wrong). 
Logged

73
Pat K7KBN
CWO4 USNR Ret.
AC5UP
Member

Posts: 3891




Ignore
« Reply #5 on: September 01, 2012, 03:40:11 AM »

.................and then you notice this thread is from 2005.

Not that there's anything wrong with that.
Logged

Never change a password on a Friday                
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!