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Re[2]: LF: Re: Should I be aiming for a better match than this?

To: John Rabson <[email protected]>
Subject: Re[2]: LF: Re: Should I be aiming for a better match than this?
From: Chris Wilson <[email protected]>
Date: Fri, 16 Oct 2015 09:30:02 +0100
In-reply-to: <[email protected]>
Organization: Gatesgarth Developments
References: <[email protected]> <43464DACBFAA49C08A73FB93FFF52105@gnat> <[email protected]> <9E19F2EA072B4AE3A7A112534A29B460@gnat> <[email protected]> <[email protected]>
Reply-to: [email protected]
Sender: [email protected]
Hello John,

Friday, October 16, 2015


Ah, right, OK John, thanks for that. I may try a galvanically isolated
matching  transformer.  I  realised  late  last  night  that my wife's
complaining of the workshop alarm having gone off seemingly randomly a
couple  of times, was associated with me transmitting when it went off
again.  The RCD in the main fuse box tripping a little earlier has now
got  her wound up about this new facet to my hobby and extremist views
such  as "you'll burn the house down", and "you'll pay for the freezer
contents if it goes off whilst we are away"... are being uttered  :)


> 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










-- 
Best regards,
 Chris                            mailto:[email protected]


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