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LF: RE: M0BMU mods for G0MRF 300 W Tx is this a gap?

To: [email protected]
Subject: LF: RE: M0BMU mods for G0MRF 300 W Tx is this a gap?
From: "Hans-Albrecht Haffa" <[email protected]>
Date: Sun, 26 Dec 2004 21:34:05 +0100
Organization: http://freemail.web.de/
Reply-to: [email protected]
Sender: [email protected]
Hello Lowfers,
yes it is a gap. A residuous gap of two core halves with lapped surfaces is still a gap. It will reduce relative permeability and remanent flux. It is better to use core halves with a bit greater gapmade of a layer of insulating tape (0,05 mm thickness ) on both sides of a core half. Lowering remanent flux from 180 mt (ungapped ring core) to about 30 mT gapped will rise magnetic swing in mMilli-Tesla. Thats what counts. If You take out the spacers of a deflection transformer, You get agood core for a forward converter SMPS or a 136 kHz PA. 55, Hans-Albrecht DK 8 ND

[email protected] schrieb am 24.12.04 10:55:28:

----- Original Message -----
From: "james moritz" <[email protected]>
To: <[email protected]>
Sent: Thursday, December 23, 2004 11:31 AM
Subject: LF: RE: M0BMU mods for G0MRF 300 W Tx


Dear Gary, LF Group,

You need one without an air gap - the air gap will drastically reduce the
winding inductance, unfortunately.

Hi All
I have used these cores and noticed no difference between them and a
continuous type core. I put the two core halves together tightly and used
the same number of turns as used on the continuous core, maybe I was lucky.
What does Jim call a gap? If they are tight together is that considered a
gap? Must the core be totally continuous?
de Mal/G3KEV












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