dl09
Full Member level 4
I bought voltage controlled oscillator from a Chinese seller. I connected a coaxial cable to the voltage controlled oscillator. the coaxial cable is suppose to serve as an
antenna. I shaved off the outer insulation and I shaved off the outer copper layer. the antenna Is 1/4 of a wavelength long. I used a spectrum analyser to detect a signal.
the seller says if the control voltage is 0 volts the out frequency is 70 megahertz. the control voltage is 0 volts. I don't think the seller list the name of the model. I doubt I can find a datasheet. the seller says if the red light turns on, that means the voltage controlled oscillator is on, so I am sure the voltage controlled oscillator is on. the seller says the output is 10 dBm, I think that equals 10 milliwatts. the spectrum analyser does not detect a signal. why not? is the signal too weak? should I use an amplifier?
antenna. I shaved off the outer insulation and I shaved off the outer copper layer. the antenna Is 1/4 of a wavelength long. I used a spectrum analyser to detect a signal.
the seller says if the control voltage is 0 volts the out frequency is 70 megahertz. the control voltage is 0 volts. I don't think the seller list the name of the model. I doubt I can find a datasheet. the seller says if the red light turns on, that means the voltage controlled oscillator is on, so I am sure the voltage controlled oscillator is on. the seller says the output is 10 dBm, I think that equals 10 milliwatts. the spectrum analyser does not detect a signal. why not? is the signal too weak? should I use an amplifier?