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| To: | [email protected] |
|---|---|
| Subject: | Re: LF: To Ponder over the weekend |
| From: | "Dick Rollema" <[email protected]> |
| Date: | Mon, 11 Nov 2002 13:06:42 +0100 |
| In-reply-to: | <[email protected]> |
| References: | <057f01c2875f$0fd4ea90$0101a8c0@athlon> <[email protected]> |
| Reply-to: | [email protected] |
| Sender: | <[email protected]> |
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To All from PA0SE: Jim, M0BMU wrote: The un-neat thing about an oil dielectric is its propensity for catching fire... also, I don't think it has particularly low loss at RF - although a lot of big TX capacitors are oil-filled, the oil is there to increase the breakdown voltage, rather than act as the main dielectric, which is usually mica, I believe. The wave form of the output voltage of my 136kHz transmitter with four HEXFET's type IRF520 in parallel-pushpull was not quite sinusoidal. To absorb the harmonics I connected a capacitor of about 50nF over the primary winding of the output transformer. I tried capacitors of different type and make but all became hot after a while. The only one running cool was a white coloured 50nF capacitor of a type that can be frequently found in German WW II radio equipment. These capacitors are oil-filled.... 73, Dick, PA0SE |
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