Thread: +7dB from BFO to diode ring mixer?
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Old February 27th 06, 05:16 PM posted to rec.radio.amateur.homebrew
Tim Wescott
 
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Default +7dB from BFO to diode ring mixer?
wrote:

hi Saandy,

I was not aware of the '0 dBm is defined to be 1mW of power into 50
ohms' part.
Rest of calculations were perfrectly understood

thank you for your assistance!

There are various dBx measures of real signal characteristics. The most
common ones that I know of are dBm (dB over 1mW), dBV (dB over 1V,
presumably ignoring impedance and therefore really just a fancy-pants
amplitude measure) and dBc (dB under carrier, very important stuff to
measure phase noise in an oscillator or transmitter).

Presumably you could define the 'x' in dBx to be anything -- if you were
married many times, for instance, dBxmil would be a measure of the
number of ex mothers-in-law you have in the room with you, but I'm not
sure if that should be 10 log (N) or 20 log (N).

--

Tim Wescott
Wescott Design Services
http://www.wescottdesign.com

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