if I don't connect the battery to a voltage controlled oscillator
General rule: Never leave any input pin floating.if the input for tuning frequency is 0 volts, the output is 70 megahertz
dB is no magnitude quantity. Do you mean dBm? What do you see, noise background? Discrete lines?if I don't connect the battery to a voltage controlled oscillator, the amplitude of the radio waves is -25 decibels, and if I connect the battery to a voltage controlled oscillator, the amplitude of the radio waves is reduced to roughly -60.
How you connect the SA? Antenna, cable?i used a spectrum analyser to measure this.
dB is a relative quantity, it's meaningless without an absolute reference. Please tell the SA brand and type.on the spectrum analyser reads dB.
dB is a relative quantity, it's meaningless without an absolute reference. Please tell the SA brand and type.
As previuosly discussed, a coaxial cable is no antenna. Please describe the complete test setup. (oscillator, analyzer, cables, antennas)
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It might be that a strong out of band RF signal is blocking the analyzer input. If so, the reduced floor would indicate RF, but that's just a guess. More information needed.
-> Then it's no "coax" anymoreI shaved off the outer copper layer
The amplitude of the radio waves is only reduced when I connect the battery, I think.
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