Coil Specifications

[green]

Making some new coils and I want to do a better job of describing the coils. Are there other things I should add to the chart?

[Skippy]

You could go International and use Metric: - specify diameter in mm or cm. Likewise if you could translate American Wire Gage/Gauge into metric then everyone can convert into their own system (eg. SWG here in the U.K) , or quote both systems.
Frequency is KHz, not MHz (unless you're meaning self-resonant freq of a PI coil??), inductance is uH with a capital H. Or even µH if you can work out how to enter the mu (it's ASCII code 230)

[green]

You could go International and use Metric: - specify diameter in mm or cm. Likewise if you could translate American Wire Gage/Gauge into metric then everyone can convert into their own system (eg. SWG here in the U.K) , or quote both systems.
Frequency is KHz, not MHz (unless you're meaning self-resonant freq of a PI coil??), inductance is uH with a capital H. Or even µH if you can work out how to enter the mu (it's ASCII code 230)

Skippy, Thanks for the suggestions. If no one else has any suggestions I'll redo it and post again. I was meaning self-resonant frequency but KHz would be alright(no decimal). SRF?

[kt315]

Are there other things I should add to the chart?

other thing you have to open ITMD and maybe... maybe... to find something on coils.
i shared this file thousand times. why i have to share it in 1001th.... its so tiring ((

just what i know about Alabama... this Morrison song https://www.youtube.com/watch?v=DX42_3ZKv8c

coil_data.txt

[Chet]

Hi Green
You should add another row for the DD receiver coil. And another dimension (9" X 14") somewhere for Oval or Race Track coils.
Thank you,
Chet

[green]

Some coils I just wound. Want to compare the three type coils. The numbers are for the wound coil, not shielded or completed. I have a lot of coils without any documentation. Just trying to document so when I make changes, can see what effect the change had. The windings for the o0o coil collapse some when winding, need more toothpicks. Can see what effect a tighter weave has. I assumed the wire diameter is the unshielded diameter.

[baum7154]

Some coils I just wound. Want to compare the three type coils. The numbers are for the wound coil, not shielded or completed. I have a lot of coils without any documentation. Just trying to document so when I make changes, can see what effect the change had. The windings for the o0o coil collapse some when winding, need more toothpicks. Can see what effect a tighter weave has. I assumed the wire diameter is the unshielded diameter.

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Hi Green,
I would specify the wire to be STRANDED or SOLID, the type of insulation, the voltage of the insulation, the SRF with and without the feedline and the feedline length. I would also differnentiate between BASKETWEAVE coils and SPIDERWOUND coils, the latter being the self shielding variety, and I would agree with CHets comment on differentiating the elliptical coil shape from the racetrack coil with parallel sides and 1/2 circle ends.

best of luck

Dan

[KRinAZ]

---------------------------------------Hi Green, I would specify the wire to be STRANDED or SOLID, the type of insulation, the voltage of the insulation, the SRF with and without the feedline and the feedline length. I would also differnentiate between BASKETWEAVE coils and SPIDERWOUND coils, the latter being the self shielding variety, and I would agree with CHets comment on differentiating the elliptical coil shape from the racetrack coil with parallel sides and 1/2 circle ends.best of luckDan

Hi Dan, I was under the impression the basketweave was designed to be self-shielding, you're saying it's not though, or did I misunderstand? Also I searched all forums here for "SPIDERWOUND" but couldn't find pics or details, google searching only came up with crystal radio antennas, would you be willing to elaborate on this coil as built for a PI detector? - many thx!

[baum7154]

To me the term 'basketweave' applies to the flat coil type that Green uses with the toothpicks where the wire is wound in a two dimensional flat plane guided by the plane of the toothpicks and is not self shielding because of this geometry.

The type of coil in the CHANCE PI COIL thread is often referred to as spider-wound and differs in that the coil is built up by winding the layers over and around the previous windings in three dimensions. The cross section of this coil tends to be round or oval and is never truly flat. It is this unique geometry that provides the capability to self shield when the outermost winding end is placed at system ground.

Regards,

Dan

[baum7154]

In thinking about a real spider web such as an orb weaver web I don't think that this is an accurate name for the three dimensionally wound air spaced coil either. I have been looking for the proper name and have yet to find it. Any real spider web I can recall is two dimensional too just like the basket weave.

I'll keep searching,

Dan

[green]

http://www.pa2mrx.nl/UK/coil%20homebrewing_uk.htm

Hi Dan, This site has a picture of a 3D coil that looks like yours

[baum7154]

Thanks Green
It looks like the 3D coil is the closest to the coil geometry we are interested in and the 3D name is apt for our air spaced coil. Perhaps the descriptor '3D AIR SPACED COIL' is how we should refer to this coil in the future to eliminate confusion.

Regards,

Dan

[KRinAZ]

To me the term 'basketweave' applies to the flat coil type that Green uses with the toothpicks where the wire is wound in a two dimensional flat plane guided by the plane of the toothpicks and is not self shielding because of this geometry.

The type of coil in the CHANCE PI COIL thread is often referred to as spider-wound and differs in that the coil is built up by winding the layers over and around the previous windings in three dimensions. The cross section of this coil tends to be round or oval and is never truly flat. It is this unique geometry that provides the capability to self shield when the outermost winding end is placed at system ground.

Regards,

Dan

OK, thx Dan, so what I've been referring to as a basketweave (BW) coil in my MPP posts is the actually the self-shielding 3D coil. I have a suggestion for the coil name - Self Shielding Basketweave (SSBW) - since a lot of folks refer to the 3D coil as a basketweave now, and there is a long history of spider wound coils being 2D also - e.g. the search coil in the mine detector metal detectors used by the US Marines during and post Vietnam war, and those crystal ham radio antennas. Just a suggestion, I'll be happy to call it whatever we all agree on...

[baum7154]

OK, thx Dan, so what I've been referring to as a basketweave (BW) coil in my MPP posts is the actually the self-shielding 3D coil. I have a suggestion for the coil name - Self Shielding Basketweave (SSBW) - since a lot of folks refer to the 3D coil as a basketweave now, and there is a long history of spider wound coils being 2D also - e.g. the search coil in the mine detector metal detectors used by the US Marines during and post Vietnam war, and those crystal ham radio antennas. Just a suggestion, I'll be happy to call it whatever we all agree on...

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I like the 'Self Shielding 3D Coil' as it is much more accurate of a description.

[baum7154]

Hi KRinAZ,
take a look at the 2 pictures of the 3D coil in Green's attachment in his Post 11 above. The author's 2005 pictures clearly show the same coil wind detailed in my postings on the Chance PI coil thread that I have called a spider coil in the past. This 3D name is accurate and predates any other description of this coil by at least 5 years, if not 70 years. Also the pictures of both the spider and basket weave coils illustrate the significant differences in the coil constructions. I think we should go with the 3D coil or 3D-Self Shielding Coil name.

Do you agree?