On Mon, 2014-06-16 at 22:51 -0700, Jim Brown wrote:
>I've done that. It's in k9yc.com/RFI-Ham.pdf My work is more
>definitive than Fair-Rite's, although they did revise their product
>line and data sheets based on my work. :)
That is something Jim! Nice job! I have always liked the rigor in your
work!
--
Thanks and 73's,
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On Mon, 2014-06-16 at 22:51 -0700, Jim Brown wrote:
> On 6/16/2014 5:36 PM, Howard Lester wrote:
> > In general, #31 is better for suppression at the lower frequencies
> > (offhand, I am thinking approximately 80 - 15 meters); #43 is best for the
> > higher frequencies and VHF. Perhaps Jim Brown will post more precise
> > information here as to frequency ranges for each.
>
> I've done that. It's in k9yc.com/RFI-Ham.pdf My work is more definitive
> than Fair-Rite's, although they did revise their product line and data
> sheets based on my work. :)
>
> In general, #31 is the better choice below 5 MHz and quite effective up
> to 200 MHz, #43 is slightly better above about 20 MHz, and the two are
> equivalent between about 5 MHz and 20 MHz. You can see this by studying
> the graphs in my pdf. In all cases, for suppression at HF and MF, you
> MUST wind a suitable number of turns to move the resonance to the range
> where you need suppression. It's a very low Q resonance (that is, quite
> broad), typical circuit Q of about 0.4 - 0.5.
>
> At whatever quantity you're buying #43 is perhaps 10% cheaper than #31.
> But the discounts for buying in quantity are much greater than 10%, so
> I've always bought #31.
>
> 73, Jim K9YC
>
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