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Results tagged with electronics
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user 1362
Questions which involve the properties or applications of individual electronic components.
2
votes
2
answers
282
views
How much does a RF amplifier use of its input power?
I've been casually aware that signal gain can be added in "stages" but never really considered how that might actually work in practice. And it seems that some RF amplifiers really prefer to only "sam …
- 7,469
5
votes
3
answers
4k
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How to find or derive the maximum safe input power to a receiver?
A number of my RF devices have a specified safe maximum input power, for example:
"The maximum RX power of HackRF One is -5 dBm. Exceeding -5 dBm can result in permanent damage!" source
"If you look …
- 7,469
8
votes
2
answers
408
views
What will the *amplitudes* of mixer products be?
The key fact about mixers, which iirc is even part of the FCC amateur radio exam(s) in the USA, is that they output "the sum and difference" of the input frequencies. And iiuc in practice it's usually …
- 7,469
1
vote
2
answers
115
views
Does a filter or inductor's power rating matter in its passband, or only in the attenuated f...
I would like to build a high-pass filter that would block reception of signals from the United States' FM broadcast range (88–108 MHz) while still allowing me to transmit VHF ham signals (around 146 M …
- 7,469
12
votes
3
answers
5k
views
Why does "high SWR" damage transmitters, instead of "impedance mismatch"?
In the audio realm, where cable lengths are insignificant compared to the signal wavelength, I would understand an impedance mismatch damaging an amplifier as follows:
Take an audio amplifier that ca …
- 7,469
4
votes
3
answers
670
views
Why is coax loss logarithmic?
With DC hookup wire, losses are directly proportional to length. If the resistance of 100m of wire is 10 ohms then the resistance of 200m of wire will be 20 ohms.
But we measure coax loss in decibels …
- 7,469
1
vote
2
answers
229
views
What's the maximum possible "DC input to radiated RF" energy efficiency of a radio transmitt...
Even from audio electronics I new that a Class A power amplifier was less than 50% efficient, and just figured maybe that was what radios tended to use, instead of the more efficient topologies, to maintain …
- 7,469
6
votes
3
answers
8k
views
How should this SWR meter's directional coupler work?
I'm wrapping up a "home build" of the MFJ-941EK antenna tuner kit and having trouble getting the wattmeter calibrated. I can't use C4 to get the reflected power reading calibrated down to 0 as is supp …
- 7,469