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| Subject: | LF: IRF510 500kHz PA stability issues - advice please |
| From: | Roger Lapthorn <[email protected]> |
| Date: | Tue, 24 Nov 2009 19:40:57 +0000 |
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I've been using a single IRF510 FET PA stage on 500kHz and it produces around 6-7W of RF. But, when adjusting my antenna I've managed to damage several devices now. I think the stage is running somewhere towards class-E looking at the PA drain waveform on the scope and I believe either the stage is going unstable or it is running in a condition in which too much current (and heat) is taken and the device fails. Are there any simple "rules of thumb" or design/biasing/decoupling guidelines to ensure that my devices don't destroy themselves with a less than perfect load? Any simple advice would be appreciated. 73s Roger G3XBM -- ------------------------------------------------------------- http://g3xbm-qrp.blogspot.com/ http://www.g3xbm.co.uk G3XBM GQRP 1678 ISWL G11088 |
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