Episode 42: cheap 2W RF amplifier, some measurements

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In this video I test the behaviour the cheap 2W rf amplifier (2Mhz - 700Mhz) bought from Aliexpress for 11.50usd:

using:
- the Siglent SDG 1032X, and
- the HP 8591E spectrum analyzer.
  1. The RF Noob
  2. HackRF
  3. amplifier
  4. HP 8591E
  5. flatness response
  6. signal generator
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Комментарии
Автор

are the harmonics due to signal generator or amplifier? what is the harmonic amplitude without the amplifier (just signal generator and analyzer)

anarpearls
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Did you notice that applying the signal reduces the current? I changed the bias for the output stage to reduce the standing current to around 300mA. It reduces the gain slightly, but it then stays more constant - possibly even increases a little with input. Very useful test - thank you.

TonyAbbey
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Ciao ! wich input power are you using from the rf generator ?

RADIOBUNKER
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Hi again. Did you get any linearity measurements at lower input power? As you said - it was generating a square wave, so very much not acting as a linear amp. You can also do this without needing the modulation by comparing input to output power as you increase from zero input to maximum.

TonyAbbey