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| To: | [email protected] |
|---|---|
| Subject: | Re: LF: Re: Should I be aiming for a better match than this? |
| From: | John Rabson <[email protected]> |
| Date: | Fri, 16 Oct 2015 09:56:42 +0200 |
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| References: | <[email protected]> <43464DACBFAA49C08A73FB93FFF52105@gnat> <[email protected]> <9E19F2EA072B4AE3A7A112534A29B460@gnat> <[email protected]> |
| Reply-to: | [email protected] |
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Hello Chris, I use the term “isolation” to emphasise the fact that it does provide galvanic isolation, which an auto-transformer does not. The transformer here is a ferrite ring type N90AB from Maplin, with a 5 turn primary winding and a 10 turn secondary. The transmitter is a 30 W class E design based on the spreadsheet by G3NYK. In this configuration, with the antenna system presenting 50 ohms, the amplifier sees the desired load of about 12 ohms. 73 John F5VLF > On 16 Oct 2015, at 00:44, Chris Wilson <[email protected]> wrote: > > … Another poster, John Rabson, talked of isolating mains > ground and RF ground. As I have had occasional RCD trips at the house > distribution panel when TX'ing at high power with this setup, I am > wondering about this. He spoke of an isolation transformer, but I am > not sure just what he meant by that. [email protected] Researching history of RABSON, BLACKSHAW, GAUNTLETT, VERLANDER and ROBSONNE |
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