Topband: Receive loop observations

[Richard (Rick) Karlquist]

The 50 turns/5 turns transformer is specific to
the loop feed in my NCJ article.  Are you cloning
my design, or adding a transformer onto some
other design?

The core I called out is much larger than would be
needed for electrical reasons, but is chosen because
the large size makes is relatively easy to wind.
(Still tedious, but not difficult).

I still have unloaded PC boards available for
$33 (incl shipping) per set which includes a
ferrite core.  You can also buy the cores from
Amidon associates.

Rick N6RK


On 4/2/2016 7:41 AM, Herbert Schoenbohm wrote:
> Just a question about loop matching ferrite coils......are these
> available anywhere pre-wound anywhere.  I wind the easy ones to match
> Beverages but the 50 turns is going to be a chore.
>
>
> Herb, KV4FZ
>
> On 4/2/2016 8:48 AM, James Rodenkirch wrote:
>> Thank you to all for the replies/comments/suggestions --- I am all
>> over finding a #61 or #43 material core for a xfmr....71.5/72 de Jim
>> R. K9JWV
>>
>> ________________________________________
>> From: Topband <topband-bounces at contesting.com> on behalf of Jim Brown
>> <jim at audiosystemsgroup.com>
>> Sent: Friday, April 1, 2016 2:55 PM
>> To: topband at contesting.com
>> Subject: Re: Topband: Receive loop observations
>>
>> On Fri,4/1/2016 1:36 PM, James Rodenkirch wrote:
>>> need to find a Fair-rite 61 core
>> N6RK notes that Fair-Rite #43 will work fine, with slightly increased
>> loss. Mu is higher, so you will likely need fewer turns to get 100 uH.
>> #43 is much easier to find.
>>
>> 73, Jim K9YC
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