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Title: Building fixed air caps from Radio 1936 Post by: WQ9E 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.
Title: Re: Building fixed air caps from Radio 1936 Post by: flintstone mop 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. Title: Re: Building fixed air caps from Radio 1936 Post by: Ed/KB1HYS 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.
Title: Re: Building fixed air caps from Radio 1936 Post by: ve8xj 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 . Title: Re: Building fixed air caps from Radio 1936 Post by: KM1H 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. AMfone - Dedicated to Amplitude Modulation on the Amateur Radio Bands
Lately its been those operating down around 500KHz where antenna voltages can be very high even with low power. |