To: | <[email protected]> |
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Subject: | LF: Re: M0BMU mods to the G0MRF PA |
From: | "James Moritz" <[email protected]> |
Date: | Sat, 15 Dec 2012 20:55:32 -0000 |
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Dear Warren, LF Group, It's a long time ago now, but... The multi-stranded winding was mainly used because it is much more flexible and so easier to wind onto the core. I used a salvaged LOPT core as if it were a toroid core, i.e. fixing the two core halves together before threading the wire through the aperture repeatedly to produce the winding. Producing a compact, even winding that lay snugly on the core using solid wire was difficult because of the stiffness of the wire. It is desireable to make the windings as compact as possible with the minimum amount of space between the turns in order to reduce the leakage inductance of the transformer as much as possible. This raises the self-resonant frequency of the transformer and reduces the amount of RC damping needed to produce a sensible drain waveform. The multiple strands do probably give some reduction in losses at 137k, but I expect only marginally. Cheers, Jim Moritz 73 de M0BMU |
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