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Amazon.com: DIRECTIONAL COUPLER
https://www.amazon.com/DIRECTIONAL-COUPLER/s?k=DIRECTIONAL+COUPLER
DIRECTIONAL COUPLERS - BONN Elektronik GmbH
https://www.bonn-elektronik.com/en/amplifier-accessories/directional-couplers/
Directional Couplers - an overview | ScienceDirect Topics
https://www.sciencedirect.com/topics/engineering/directional-couplers
Directional couplers can be designed using microstrip, stripline, coax, or waveguide technology. The device itself comes in a variety of packages ranging from blocks with RF connectors or solder pins, lie on a substrate carrier, or be designed within a larger radio frequency integrated circuit (RF IC) that performs other functions as well.
How I can extract audio from a Directional Coupler for FM ...
https://www.edaboard.com/threads/how-i-can-extract-audio-from-a-directional-coupler-for-fm.39099/
You need to sample the modulated rf signal, probably with something like a 50 dB directional coupler, and demodulate it. You can demodulate it a number of ways, but an LC frequency discriminator with schottky diodes works pretty well--it will output an analog voltage proportional to frequency deviation.
RF Directional Couplers - Coaxial
https://www.surplussales.com/RF/RFDirCo-2.html
Coaxial Directional Coupler. 10 dB Coupling. Enlarge Image. (RF) 3003-10. Narda coaxial directional coupler. 10 dB coupling, 200 watt, "N" connectors, 2 - 4 GHz, SWR = 1.15. New, unused. $175 each - $159 (3+) 5 Piece RF Assortment. Enlarge Image.
Application Note: Directional Couplers
https://www.minicircuits.com/app/COUP7-2.pdf
The basic function of a directional coupler is to operate on an input so that two output signals are available. However, when the input is applied to the opposite port of an internally terminated coupler, only one output signal is produced. directional coupler characteristics. 1. The output signals are unequal in amplitude.
The Directional Coupler - ITTC
http://www.ittc.ku.edu/~jstiles/723/handouts/The%20Directional%20Coupler.pdf
4/20/2010 The Directional Coupler.doc 1/11 Jim Stiles The Univ. of Kansas Dept. of EECS The Directional Coupler A directional coupler is a 4-port network that is designed to divide and distribute power. Although this would seem to be a particularly mundane and simple task, these devices are both very important in microwave systems, and very
Microwave Engineering - Directional Couplers
https://www.tutorialspoint.com/microwave_engineering/microwave_engineering_directional_couplers.htm
Directional Coupler is a 4-port waveguide junction consisting of a primary main waveguide and a secondary auxiliary waveguide. The following figure shows the image of a directional coupler. Directional coupler is used to couple the Microwave power which may be unidirectional or bi-directional. Properties of Directional Couplers
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