[Amps] Swan Mark 1 on 160 meters

[Jim]

That was my guess too Peter.
They are now gone for 80 and 160 meters. A coil of wire now serves the 
application.  And does a better job of it too. Less heat.


Thanks
73
Jim W7RY

On 7/1/2021 5:06 AM, Peter Voelpel wrote:
> Hi Jim,
>
> I guess the shorted 160m coil might have been resonant on 10m and the
> circulated current caused the heating of the toroid, not the coupling.
>
> 73
> Peter
>
>
> -----Original Message-----
> From: Amps [mailto:amps-bounces at contesting.com] On Behalf Of Jim
> Sent: Donnerstag, 1. Juli 2021 04:49
> To: amps at contesting.com
> Subject: Re: [Amps] Swan Mark 1 on 160 meters
>
> If I knew, I would have stated that fack Lou.
>
> Some sort of inductive coupling I guess. Even through the 10 meter coils
> was 8 inches away from the 80/160 meter toriadal coils.
>
> It was covered at great length here on the mailing list when I made the
> discovery. 8 years ago.
>
>
>
>
> Thanks
> 73
> Jim W7RY
>
> On 6/30/2021 2:37 PM, gudguyham via Amps wrote:
>> How does a torrid used on 160/80 meters get hot on 10 meters if it's
> shorted out?
>>
>> Sent from the all new AOL app for iOS
>>
>>
>> On Wednesday, June 30, 2021, 2:42 PM, Jim Brown
> <jim at audiosystemsgroup.com> wrote:
>> On 6/30/2021 5:34 AM, Jim wrote:
>>> DO NOT use toriods. I speek from experiance. Had a reaction when on 10
>>> meters with my 8877 amplifier. The 160 meter toriod coils would start
>>> smoking when on 10 meters. I was using a shorting switch.
>> "Toroid" is a shape in which hundreds of very different materials are
>> manufactured. I know nothing about powdered iron toroids (although they
>> are very successfully used in the 5B4AGN-designed bandpass filter kits I
>> built years ago), but I know a LOT about ferrite toroids.
>>
>> The Fair-Rite catalog is a treasure trove for learning about ferrite
>> materials. The company has developed several dozen different chemical
>> mixes for very specific purposes, and there are mixes that can handle a
>> lot of power in specific frequency ranges. These mixes have been
>> assigned numbers. In general, these materials have low loss at low
>> frequencies, high loss at higher frequencies.
>>
>> Over the years, a few select companies have published technical data and
>> applications notes so detailed and filled with information that you can
>> learn as much from them as from colleges and technical schools. Those
>> published by RCA (tubes), National Semiconductor, Electro-Voice
>> (loudspeakers) are examples. The Fair-Rite catalog is deservedly within
>> this group.
>>
>> The catalog is here.
>>
>> http://www.fair-rite.com/files1/Fair-Rite_Catalog_17th_Edition.pdf
>>
>> Beginning on page 10, start by reading the brief description at the top
>> of the page for each material, then studying the graph of "Complex
>> Permeability vs. Frequency." On this graph, mu' is the purely inductive
>> permeability of the material, mu'' is the resistive component, where R
>> and X are in series.
>>
>> For example, in the first entry, #68, permeability is fairly low (about
>> 15), but loss is also quite low up to about 100 MHz, where it begins to
>> rise rapidly. The next entry, #67, has higher permeability (about 25)
>> and comparably low loss up to about 30 MHz. N6RK, a very smart engineer
>> who retired from HP some years ago, has used #67 toroids for high power
>> transformers.
>>
>> Ferrite materials are useful as common mode chokes for RFI suppression
>> in frequency ranges where they are very lossy. #61 is useful as an
>> inductor core (including transformers) at HF, but starts getting lossy
>> around 10 MHz (where mu'' starts rising), and is sufficiently lossy at
>> UHF that it's useful for suppression.
>>
>> 73, Jim K9YC
>>
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