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K1 build question: T1, turn count method.

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K1 build question: T1, turn count method.

I have completed the RF board RX build portion and about to test it with the filter board and front panel.

I realize I may have a discrepancy on turns for T1. I count a turn by tracing the wire around the toroid and get 4 turns of green but the manual page 14 states I should count a turn each time the wire passes through the center of the toroid which is 5.

As T1 is an impedance match (1:5?) will the “extra” turn make a huge difference?

Intuitively I would say yes as it’s 20% more turns by the page 14 method.

Any guidance on whether I should correct this is welcome.

Paul
W6PNG/M0SNA
www.nomadic.blog
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k6dgw

Re: K1 build question: T1, turn count method.

You count "passages through the hole" as turns in all cases with toroid
cores. A straight wire thru the donut is one turn. I can't answer your
question ["does it make a difference?"] because I don't have a K1, but I
did build a K2, and based on that, I think the answer is "Yes, it will
make a difference."

73,
Fred ["Skip"] K6DGW
Sparks NV DM09dn
Washoe County

On 5/29/2020 12:49 PM, Paul Gacek via Elecraft wrote:

> I have completed the RF board RX build portion and about to test it with the filter board and front panel.
>
> I realize I may have a discrepancy on turns for T1. I count a turn by tracing the wire around the toroid and get 4 turns of green but the manual page 14 states I should count a turn each time the wire passes through the center of the toroid which is 5.
>
> As T1 is an impedance match (1:5?) will the “extra” turn make a huge difference?
>
> Intuitively I would say yes as it’s 20% more turns by the page 14 method.
>
> Any guidance on whether I should correct this is welcome.
>
> Paul
> W6PNG/M0SNA
> www.nomadic.blog
>

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Elecraft mailing list

Re: K1 build question: T1, turn count method.

Thanks all for the feedback.

T1 correction is now made and now off to make a cup of tea (there’s a Brit in me somewhere....).

Paul Gacek
W6PNG/M0SNA
Www.nomadic.blog

> On May 29, 2020, at 1:51 PM, Fred Jensen <[hidden email]> wrote:
>
> You count "passages through the hole" as turns in all cases with toroid cores. A straight wire thru the donut is one turn. I can't answer your question ["does it make a difference?"] because I don't have a K1, but I did build a K2, and based on that, I think the answer is "Yes, it will make a difference."
>
> 73,
> Fred ["Skip"] K6DGW
> Sparks NV DM09dn
> Washoe County
>
>> On 5/29/2020 12:49 PM, Paul Gacek via Elecraft wrote:
>> I have completed the RF board RX build portion and about to test it with the filter board and front panel.
>>
>> I realize I may have a discrepancy on turns for T1. I count a turn by tracing the wire around the toroid and get 4 turns of green but the manual page 14 states I should count a turn each time the wire passes through the center of the toroid which is 5.
>>
>> As T1 is an impedance match (1:5?) will the “extra” turn make a huge difference?
>>
>> Intuitively I would say yes as it’s 20% more turns by the page 14 method.
>>
>> Any guidance on whether I should correct this is welcome.
>>
>> Paul
>> W6PNG/M0SNA
>> www.nomadic.blog
>>
>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
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>
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> Please help support this email list: http://www.qsl.net/donate.html
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