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Originally Posted by G6Tanuki
You need to define the mode used in order to get any sense of power.
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I'm assuming key down CW for maybe 10 seconds.
Quote:
Originally Posted by G0HZU_JMR
I recommend using a 1N5711 Schottky diode because they have consistent performance in terms of efficiency and leakage up into VHF. A randomly selected (ebay?) Ge diode is likely to cost more and perform worse than the 1N5711 here so why take the risk 
Quote:
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There seems to be consensus that the capacitance involved in using a scope complicates the issue
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I'm not sure a scope is the right tool up at 29MHz if the aim is to check the accuracy of a power meter. Also, I'd be concerned about damage to the scope. |
I guess the use of the scope stems from the OP (where he?), or earlier posts, but also that most licenced amateurs will have a scope of some kind. Re diodes, I still have quite a few gold-bonded Ge point contacts bought long ago, but I think this is a
point of detail
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Ah; now way back in post #26 Wrangler was proposing to use a 30dB attenuator next to the 50R load and I had assumed that the thread had absorbed that suggestion as the means of protecting the scope, but maybe not?
So to sum up, what I think is useful to baseline here is a PM
useful for 100W to 30MHz (as a starter), to be used by driving it with full power CW for up to 10 seconds, and with the load having a closely connected attenuator (~30dB) feeding either a diode probe or a scope.My version would have a temperature sensor(s) too!
Doesn't have to be that concept.
B