Re: [Amps] Henry RF generators

["Fuqua, William L." <wlfuqu00@uky.edu>]

 I have a variation of the 3000D which is single phase 240VAC. Operating 
frequency is 13.560 MHz.
It uses 2 2000D single phase transformers each with bridge rectifier (DC output 
paralleled) and primary windings paralleled.
It also has two vacuum variable capacitors and had a higher power 4-400A 
driver. I sold the driver at Dayton around 10 years ago.

73
Bill wa4lav



________________________________
From: Amps <amps-bounces@contesting.com> on behalf of Chris Wilson 
<chris@chriswilson.tv>
Sent: Tuesday, December 15, 2020 6:34 PM
To: amps@contesting.com <amps@contesting.com>
Subject: [Amps] Henry RF generators

CAUTION: External Sender


  15/12/2020 23:23

Many Henry RF generators on 27 or 14 MHz use a brass (?) slug within a copper 
tube coil for inductance changing (as the turns counter advances the slug 
within the coil the inductance reduces) and a rather Heath Robinson variable 
capacitor using two brass  plates, with a Teflon insulation sheet between them. 
Now I realize they were not intended to be frequency agile, so my question is, 
is there an advantage to changing the strange looking variable cap for a vacuum 
variable? Is the consensus of opinion that slug tuning the inductor is fine and 
can be left as is? Thanks.

An example Henry RF deck is at 
https://nam04.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.chriswilson.tv%2Fdeck.jpg&amp;data=04%7C01%7Cwlfuqu00%40uky.edu%7Cdc9dc881b28a4b8b47f208d8a1520c7f%7C2b30530b69b64457b818481cb53d42ae%7C0%7C0%7C637436721072872025%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&amp;sdata=EPm43800jFI%2BA7UgB1fjwPw4pNw%2BZNgS41ycDdCuDsg%3D&amp;reserved=0

--
       Best Regards,
                   Chris Wilson.
mailto: chris@chriswilson.tv

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