It is not special, just K material which was available at
http://www.cwsbytemark.com/index.php?main_page=index&cPath=206_221 and
now replaced with f-234-K a bit smaller in diameter.
73 Danny E73M
On Sun, 8 Jan 2012 16:24:34 -0600, dalej wrote:
> "Special mix toroid with low permeability allows broad frequency
> coverage"
>
> Hi Danny,
>
> I wonder what the "special mix" is.
>
> Dale, k9vuj
>
>
> On 08, Jan 2012, at 16:04, e73m@e73m.com wrote:
>
>> I have made this one
>> http://www.balundesigns.com/servlet/the-32/balun-designs-baluns-1-cln-1/Detail
>>
>> 73 Danny E73M
>>
>> On Sun, 8 Jan 2012 15:01:38 -0600, dalej wrote:
>>> Which model were you trying to emulate?
>>>
>>> Dale, k9vuj
>>>
>>>
>>> On 08, Jan 2012, at 14:14, e73m@e73m.com wrote:
>>>
>>>> Hello,
>>>>
>>>> did anyone measured balundesigns.com chokes. I have tried to make
>>>> replica with FT240-K core and wound as on pictures but simple S21
>>>> measurements shows poor response below 21MHz, nowhere near their
>>>> published charts.
>>>>
>>>> It looks like their core is a bit different then then standard
>>>> FT240-K
>>>> core as used in Comtek/DXengineering chokes.
>>>>
>>>> 73 Danny E73M
>>>>
>>>> _______________________________________________
>>>> RFI mailing list
>>>> RFI@contesting.com
>>>> http://lists.contesting.com/mailman/listinfo/rfi
>>
_______________________________________________
RFI mailing list
RFI@contesting.com
http://lists.contesting.com/mailman/listinfo/rfi
|