Re: Mods to RockMite, improved spectral purity

[ Follow Ups | Post Followup | Return to QRP Forum ]


Posted by:  Mike N0MF

Posted On:  09/16/04

Subject:  Re: Mods to RockMite, improved spectral purity

Message Posted:
    In Reply to: Mods to RockMite, improved spectral purity posted by Doug W7RDP on 09/16/04


Yup Doug... it makes a difference. You need to calculate
how many turns the larger core needs to provide the 1.5 uH.
Different size cores have different Al values and they are
not the same. It really is a simple thing to figure out...
if you have the formula:

Turns= 100 x square root of (desired L(uH)/Al value)

the Al value of a t25-6 core is 26
the Al value of a T37-6 core is 30

I'll let you do the math. If you have a problem, just ask.

This info about cores in contained the a publication put out
by the ARRL called "The ARRL Electronics Data Book. It is
about 12 buxs. This info is also available on some of the
websites that sell cores I think...probably Amidon. But,
the formula above will work just fine.

Mike N0MF



Follow Ups:



Post a Followup

Name/Call:
E-Mail:
Subject:
Message to Post:
Use Fixed Width Font (Useful for lining up columns of data in log sheets)
Link URL:
(This can be a link to a web page or anything else.)
Link Name:
(This is an optional description or title for the URL above.)
Picture:
(This must be the full address of a .JPG or .GIF)
Check this box to receive an e-mail when someone replies to your message


 

[ Posting Rules | Follow Ups | Return to QRP Forum ]