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 Post subject: Winding Antenna Coils
PostPosted: Jun Mon 20, 2022 10:43 pm 
Member

Joined: Sep Sat 18, 2010 2:48 am
Posts: 385
Location: Rogers AR
Looking for best practice tips on winning these. Should the antenna winding be below the grid winding on the coil form? Also does it matter if the antenna side or ground side is closest to the grid coil?

I know they need to be wound in the same direction but haven't read any more tips other than that.

Attached is a schematic I am interested in building


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Screenshot_20220620-173916_Drive.jpg
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 Post subject: Re: Winding Antenna Coils
PostPosted: Jun Tue 21, 2022 3:48 pm 
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Joined: May Tue 30, 2006 3:46 pm
Posts: 11497
Location: Santa Rosa, CA
Not knowing what your circuit might be, here are some suggestions:

https://antiqueradios.com/forums/viewtopic.php?f=12&t=377080&view=next


Image

The "Ocean Hopper" kit was a popular starter radio and if you search, you can find some useful data.

Rich

PS: I can't find WA6VVL's excellent page of Ocean Hopper coil-winding data in a full-size JPG. Anyone have a link?

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 Post subject: Re: Winding Antenna Coils
PostPosted: Jun Tue 21, 2022 4:46 pm 
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Joined: May Tue 30, 2006 3:46 pm
Posts: 11497
Location: Santa Rosa, CA
I found the coil data on an old hard drive.


Attachment:
CoilDataOHopper.jpeg
CoilDataOHopper.jpeg [ 274.15 KiB | Viewed 767 times ]


Hopefully, this will now be available on ARF for a few months.


Rich


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 Post subject: Re: Winding Antenna Coils
PostPosted: Jun Tue 21, 2022 6:16 pm 
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Joined: Jun Tue 14, 2022 4:34 pm
Posts: 4
My understanding is that the antenna winding is placed at the ground end of the grid winding to minimize capacitive coupling between the windings. The phasing between the two windings doesn't matter, AFAIK, so either the ground wire or the antenna wire could nearest the grid winding.


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 Post subject: Re: Winding Antenna Coils
PostPosted: Jun Tue 21, 2022 7:00 pm 
Member

Joined: May Tue 30, 2006 3:46 pm
Posts: 11497
Location: Santa Rosa, CA
If it's a regenerative circuit, the phasing is important on the tickler vs. grid. Antenna can be either way.

Rich


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 Post subject: Re: Winding Antenna Coils
PostPosted: Jun Mon 27, 2022 6:14 pm 
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Joined: Mar Wed 26, 2008 2:06 pm
Posts: 881
Location: Cave Springs, AR
You may want to consider winding them on separate forms. Variable coupling is sometimes a nice thing to have.

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Mark


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