Re: mono band 2 meters rig based on the micro BITx circuit #ubitx #2meters

Jerry Gaffke
 

The formulas at the top of that webpage are having trouble representing exponents.
Probably got lost when scraped up with a copy and paste from some other source.

For example:  "Note that many other manufacturers quote AL as nH/t2 for both types of material. "
That should read   AL=nH/(t**2)   where t**2 is the number of turns squared.
Also:  "Ferrite:  turns = 1000 ((desired L/AL) 0.5) (where L in mH) "
should be    turns = (1000*(mH/AL))**0.5)   =  sqrt(1000*(mH/AL))

But otherwise, a good source of info on torroids.

Here's a very interesting writeup on the sorts stuff that go wacky when using torroids:
    http://g8jnj.webs.com/Balun%20construction.pdf

Jerry, KE7ER



On Sat, Apr 28, 2018 at 10:27 am, Ashhar Farhan wrote:
Thanks,
Very useful. Bookmarked. 
- f
. . .

 

On Sat, 28 Apr 2018, 22:46 Dexter N Muir, <dexy@...> wrote:

Comprehensive info at: http://www.catzco.com/toroids.htm

Hopefully helpfully
Dex, ZL2DEX

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