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| Subject: | Re: LF: Op32: 2E0ILY >>> UA9UIZ |
| From: | DK7FC <[email protected]> |
| Date: | Mon, 14 Nov 2016 17:21:27 +0100 |
| In-reply-to: | <[email protected]> |
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Hi Chris, Am 14.11.2016 16:52, schrieb Chris Wilson: Yes, sure. Check the gate-source voltage during a transmission (using the antenna) with a scope. I don't know the design of your PA but if it is a switch mode PA, the rise time of the Vgs should be in the range of 100 ns or shorter. Post a capture of that measurement if you like.If a lack of drive signal failed to trip the amp, that too may be the cause? ...which is even more informative but maybe not so comfortable for a quick check. I can recommend the "tuning meter" shown by M0BMU, if you want a better overview without running the scope all the time. You probably know it. It is very useful and easy to build on LF.I must build an RF ammeter. At the moment I just have a "Scopematch" in the co-ax near the amp, in the shack 73, Stefan |
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