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Theoretically if is not oscillating means that is stable
But this concept is not always true. The amplifier can be unstable only at some output levels. The oscillation can occur at operating frequency, but in the same time can occur anywhere, way far from that frequency.
To verify if is stable the simplest way is to use a Spectrum Analyzer at the PA output.
If the amplifier, without input power, takes more DC current than should take, could be an indication that is oscillating somewhere.
it is easy to check the stability of the power amplifier,follow the following steps:
1) link the signal source and the power amplifier and the attenuator with the spectrum analyzer.
2) set the power amplifier analyzer full span
3) then turn on your power amplifier and let the signal source shut down(no rf signal output)
4)observe the output of the spectrum analyzer
5)if the screen is clear(there is no spur frequency display),then your amplifier is stability,otherwise your amplifier is not unstability
The stability of the power amplifier need to consider the factors likes supply or battery voltage, and also the loading. The above factors is also critical for the potential "oscillation" occurs.
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