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Author Topic: B&W Swinging Link Coils  (Read 1677 times)
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W3SLK
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« on: March 30, 2024, 04:50:14 PM »

Instead of resurrecting the older thread, I followed the advice of this BB and decided upon a new thread. The information from the 2007 thread was a boon of information: http://amfone.net/Amforum/index.php?topic=9518.0
There is a lot of information in the 1941 ARRgghhL Handbook especially the B&W ad for the coils, complete with diameter, inductance and wire gauge used for each coil. However, a picture speaks a thousand words. I know they are rarer than hen's teeth, but does anyone have a good photo of an 160M HDVL coil? I have several good 80M HDVL coils, but I would like to see if I can compose a 160M jobber.
On a separate note, while working on a HP-606A signal gen, I found I had to repair T212 in the amplifier section of the turret. When I sought out some guidance about this on the HP@groups.io forum, a former HP employee told me that to make Q-dope all one has to do is dissolve styrofoam in MEK. In the thread from 2007, I used acetone and acrylic, (which is still holding up after 25+ years. But having just purchased a small bottle of commercially available Q-dope, I can attest it is MEK based. So, I will use that along with some acrylic strips to fix some of my coils that fell victim to that damn hygroscopic acetate junk that B&W and BUD used in assembling their coils.
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Mike(y)/W3SLK
Invisible airwaves crackle with life, bright antenna bristle with the energy. Emotional feedback, on timeless wavelength, bearing a gift beyond lights, almost free.... Spirit of Radio/Rush
KL7OF
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« Reply #1 on: April 30, 2024, 08:07:28 PM »

The B and W ad give specs for the band coils....that is useful....But, I have a question about the swinging link coil...   the ads show the same 3 turn swinging link used with all the coils?  I have a PP 100th rig that I used' on 20M for years with the 3 turn coil.  I changed to 10 meters and the output power dropped considerably...   I changed the link coil to a smaller diameter 2 turn and the power came up quite a bit , but there should be more.  I'm interested in specs for swinging links that are optimum for the band in use.  Is there a formula to calculate the value for the swing coil???  So far I've  used cut and try....
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W3SLK
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« Reply #2 on: May 02, 2024, 10:45:15 AM »

OK the board seems to have a problem. It will not allow me to upload a 700Kb PDF file. If anyone wants the information you can find it in Chapter 5 pp 83 of the ARRggghhL 1941 Handbook or contact me off line and I will send it via email.
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Mike(y)/W3SLK
Invisible airwaves crackle with life, bright antenna bristle with the energy. Emotional feedback, on timeless wavelength, bearing a gift beyond lights, almost free.... Spirit of Radio/Rush
Pete, WA2CWA
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« Reply #3 on: May 02, 2024, 02:39:34 PM »

In a pinch, QRZ has a forum test area for trial postings.
You can create a test file, add your pdf, and then point to it back here.
Go to Forums; scroll all the way down to the "Forum Test Area"

You can also create a folder in the Gallery here, upload the pdf to it, and then in your post, point to it.

Here's the pdf I just added to the QRZ trial posting test area:
https://forums.qrz.com/index.php?attachments/argonne2-pdf.1179345/
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Pete, WA2CWA - "A Cluttered Desk is a Sign of Genius"
KL7OF
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« Reply #4 on: May 02, 2024, 09:33:37 PM »

Tnx. Mikey
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W3SLK
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« Reply #5 on: May 03, 2024, 03:52:34 PM »

Whatever the issue is it is still there. I've tried it as a PDF, a PNG and a JPG and nothing works.
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Mike(y)/W3SLK
Invisible airwaves crackle with life, bright antenna bristle with the energy. Emotional feedback, on timeless wavelength, bearing a gift beyond lights, almost free.... Spirit of Radio/Rush
Steve - K4HX
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« Reply #6 on: May 03, 2024, 08:46:16 PM »

It should work now.
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W3SLK
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« Reply #7 on: May 04, 2024, 04:11:03 PM »

As promised, here is the data from the 1941 ARRgghhL Handbook that I think Steve, KL7OF was seeking.


* ARRL Coil Data.jpg (622.27 KB, 1823x1953 - viewed 109 times.)
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Mike(y)/W3SLK
Invisible airwaves crackle with life, bright antenna bristle with the energy. Emotional feedback, on timeless wavelength, bearing a gift beyond lights, almost free.... Spirit of Radio/Rush
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