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| To: | [email protected] |
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| Subject: | Re: LF: MF: CQ stopped, problems |
| From: | DK7FC <[email protected]> |
| Date: | Wed, 03 Jan 2018 12:43:05 +0100 |
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Am 03.01.2018 00:37, schrieb N1BUG: I was forced to stop calling CQ on JT9 at 2320 UT when my PA again became unstable. So it is a thermal problem!? Usually LF should be easier than MF. If MF is easier, than it could be saturation of cores (at LF) or too low time constants of RC components. But if the cores stays cold and the voltages are constant, this should not happen.This is the same dual band PA I am having so much trouble with on LF.On MF it will make about twice as much power into the antenna before it has problems. On MF it is much more efficient with the FET running almost cold compared to very warm at half the power level on LF.Then you should use more turns on your 1:9 transformer!! E.g. 3x10 turns instead of 3x5 turns. 73, Stefan |
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