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Microwave frequency doublers multipliers coaxial to 12 Ghz ...
https://www.sigatek.com/Frequency-Doublers
Frequency Doublers & Multipliers - Pulsar Microwave
https://www.pulsarmicrowave.com/products/frequency_doublers
Sub Audio Frequency Doubler | Electronics Forums
https://www.electronicspoint.com/forums/threads/sub-audio-frequency-doubler.36531/
"audible" is to use the signal to frequency-modulate a tone near the mid-range of human hearing. This is not the original "sound" by any stretch. Simply doubling a 20Hz signal to 40Hz will be complex and of very limited utility as you are still at the extreme of audible hearing. I know people will tell me I'm wrong, but these are the same people who
Fully digital synchronous frequency doubler for FM stereo ...
https://iopscience.iop.org/article/10.1088/2631-8695/ab7b37
A frequency doubler circuit is required on the receiver side of a FM demodulator. The audio spectrum of a stereo FM is shown in figure 1(a). The transmitter generates 38 KHz signal that is used to encode the stereo signals. It is divided by two to generate the pilot tone of 19 KHz. The pilot tone is transmitted along with the FM signal.
RF Frequency Doublers - Surplus & Sales
https://www.surplussales.com/RF/RFFreqDoubler.html
Marki Microwave frequency doubler. "SMA" connectors. Input: 1.5 to 3 GHz @ 10 dBm. Output: 3.0 to 6.0 GHz. Insertion Loss: 13 dB max. $75 each. Frequency Doubler. Input: +18 dBm / 1 - 4 GHz. Output: +3 dBm / 2 - 8 GHz.
What is a Frequency Doubler? - Learning about Electronics
http://www.learningaboutelectronics.com/Articles/What-is-a-frequency-doubler
A Frequency Doubler is device that outputs the same signal that is fed into it but with double the frequency. So it gives out exactly twice (2x) the frequency as output. So, for example, if a frequency doubler has a 500Hz signal as its input, it will output a 1KHz signal. Being that frequency doublers multiply the analog (AC) inputs by 2, they are referred to as analog …
How to build a frequency doubler | Cakewalk Forums
http://forum.cakewalk.com/How-to-build-a-frequency-doubler-m1590813.aspx
In the analog realm frequency doubling is usually done by distorting the life out of the input signal, and then filtering out everything but the second harmonic, which is exactly one octave above the input signal.
Frequency Multipliers - Doublers, Triplers, Quadruplers ...
https://www.minicircuits.com/WebStore/Multipliers.html?ez_sample=Y
Switching Diode Frequency Doublers - techlib.com
http://techlib.com/files/diodedbl.pdf
Frequency doublers are commonly constructed from full-wave voltage rectifiers and have high conversion efficiency with good odd harmonic rejection. The higher even harmonics rapidly drop by the square of the harmonic number. In other words, the full-wave rectifier's waveform looks much like the desired second harmonic
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