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Old 6th Dec 2017, 10:07 pm   #6
Skywave
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Join Date: Jun 2006
Location: Chard, south Somerset, UK.
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Question Re: 'Kalmus' wideband RFPA: info.?

Quote:
Originally Posted by Herald1360 View Post
+/- 2dB gain flatness in a 50W amp used as an RFPA for transmitting could be a pain - power out could vary between 50W and 20W whilst still being "in spec" for a particular input level.
By my arithmetic, +2 dB on 50-watts is 80-watts; -2 dB on 50-watts is 32-watts (all to nearest watt). So the output could vary between 32 to 80 watts. OTOH, 20-watts to 50-watts is a change of +4dB. But that corresponds to a gain variation of +4 dB / -0 dB. That is not the same as 2 dB.

Al.
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