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The basis of this tutorial is a combination of my engineering education, 60 years in ham radio, my work as vice-chair of . home audio system, Ethernet signals on CAT5/6 cable, and the RF signal carried by the feedline connecting our . this function. There is an excellent discussion of this in w2du.com/Chapter05.pdf
Audio Systems Group, Inc. audiosystemsgroup.com 55 years in ham radio, my work as vice-chair of the AES Standards Committee working group on EMC, and extensive re- search on RFI in the pro audio world where I've made my living. In PDF form you can download his ten-page “white paper” at this link:.
your receiver audio output.3. Finding the RFI Source. Once you have an idea of what might be causing the RFI problem, you still need to find the source. Figure 1 shows a block diagram of the HF RDF system that I use. Grow light RFI is often prevalent in the. 40 meter band, but a Yagi antenna is obviously not practical.
RFI and Ferrites. Jim Brown K9YC. Audio Systems Group, Inc. Santa Cruz firstname.lastname@example.org. Primary Interference Mechanisms. • Common-mode Nearly all ham gear has pin 1 problems. – Mic inputs. – Keying inputs. – Control inputs and outputs. • Nearly all computers have pin 1 problems. – Sound cards.
RFI. 1. Proper grounding of all electronic equipment is of paramount importance. In a modern station, many items of equipment are connected: transceiver, power amplifier, PC, control boxes, switch boxes, If you use microHAM "keyers" a good test is to remove the DB15/DB37 connector and USB cable from the keyer.
11 Dec 2016 Understanding How Ferrites Can Prevent and. Eliminate RF Interference to Audio Systems by Jim Brown, K9YC Audio Systems Group, Inc. audiosystemsgroup.com/SAC0305Ferrites.pdf. A Ham's Guide to RFI, Ferrites, Baluns, and Audio Interfacing Revision 5a -- 5 Jun 2010 by Jim Brown, K9YC
Member Bob Cordell covers this in his big book 'Designing Audio Power Amplifiers'. Jim Brown covers this in his paper: A Ham's Guide to RFI, Ferrites, Baluns, and Audio Interfacing Revision 5a 5 Jun 2010 by Jim Brown K9YC Audio Systems Group, Inc. www.audiosystemsgroup.com/RFI-Ham.pdf
Please provide a basic, non-technical, explanation of how RFI gets into a microphone (wired or wireless) or into the sound system, and why I hear it?
Ferrites and High Power. • If both conductors of high power circuits are wound through core, the fields cancel, so only the common mode current contributes to saturation. • Thus, ferrite common mode are effective on loudspeaker and power wiring. • Common mode chokes have no effect on audio, video, or control system
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