[Amps] Henry RF generators

[Fuqua, William L.]

 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



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From: Amps <amps-bounces at contesting.com> on behalf of Chris Wilson <chris at chriswilson.tv>
Sent: Tuesday, December 15, 2020 6:34 PM
To: amps at contesting.com <amps at 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&data=04%7C01%7Cwlfuqu00%40uky.edu%7Cdc9dc881b28a4b8b47f208d8a1520c7f%7C2b30530b69b64457b818481cb53d42ae%7C0%7C0%7C637436721072872025%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=EPm43800jFI%2BA7UgB1fjwPw4pNw%2BZNgS41ycDdCuDsg%3D&reserved=0

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       Best Regards,
                   Chris Wilson.
mailto: chris at chriswilson.tv