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Building fixed air caps from Radio 1936




 
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Author Topic: Building fixed air caps from Radio 1936  (Read 1728 times)
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WQ9E
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« on: March 10, 2012, 10:18:09 PM »

For those who want to try their hand at building fixed high voltage transmitting caps here is an article from Radio magazine.

* Building Fixed Air Caps.pdf (655.3 KB - downloaded 206 times.)
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Rodger WQ9E
flintstone mop
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« Reply #1 on: March 11, 2012, 08:21:03 AM »

Someone used a similar build in a recent QST article, building a remote control tuner. Not very complicated.
It was antenna month in QST.
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Fred KC4MOP
Ed/KB1HYS
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« Reply #2 on: March 11, 2012, 11:05:08 AM »

Interesting article.   Thanks for posting!  Hopefully we'll see more.  Reading all three with a cup of coffee on a quiet Sunday morning was quite enjoyable.
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73 de Ed/KB1HYS
Happiness is Hot Tubes, Cold 807's, and warm room filling AM Sound.
 "I've spent three quarters of my life trying to figure out how to do a $50 job for $.50, the rest I spent trying to come up with the $0.50" - D. Gingery
ve8xj
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« Reply #3 on: March 11, 2012, 11:46:46 AM »

I LOVE these old "RADIO" magazine articles . I have a pile of these from 1937 to 1941 that I bought when I was 16 at a dusty run down second hand book store and they have gotten many readings over the years. That real radio .

One thing I mean to do is make scans of all of them at some point . They are incredible records of an amazing point in history.

Thanks for posting this .
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KM1H
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« Reply #4 on: March 11, 2012, 12:51:27 PM »

Ive seen that style used since 160 was opened to 1500W and large spacings were needed for some shunt fed towers. My own install used a 7500V (dual 150pf if I remember) bread slicer with 200pf 15KV fixed C.

Lately its been those operating down around 500KHz where antenna voltages can be very high even with low power.

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