https://www.google.com/search?q=14+gauge+twisted+speaker+wire
wunder K6WRU On Mar 20, 2013, at 4:19 PM, ab2tc wrote: > Hi, > > Please indicate a source of twisted pair wire suitable for speaker feeds. > #16 or #14 is fine for me. I am still having trouble keeping my 15m signals > out of my family room system. Currently that room's speaker wire is of the > parallel kind. > > AB2TC - Knut > > > Jim Brown-10 wrote >>> Your position should be to offer to assist a qualified technician in >>>> isolating and correcting any deficiencies by providing periods of >>>> operating to test the results of any repairs. >> >> I'd say it depends entirely on the attitude of the RFI victiim, and the >> ham's relationship with that party. The vast majority of RFI complaints >> today are the result of Pin One Problems in the victim equipment. These >> are a manufacturing defect that is the result of poor design, and any >> wiring connected to the equipment will act as a receiving antenna for >> our signals, where they will be rectified and amplified. >> >> In today's world, "qualified technician" for consumer electronics is an >> oxymoron. >> >> Several years ago, I helped ND2T diagnose and cure strong RFI to his >> next door neighbor's "exotic high futility" system, in a living room >> only 20 ft from Tom's antennas, which were driven by a big ACOM legal >> limit amp. Tom introduced me as an audio expert and RFI expert (which I >> am) then returned to his shack and transmitted on all the bands. I stuck >> chokes on cables until the RFI went away, and by the time Tom arrived >> after our work was done, had the guy ready to open his wallet to buy >> them at my cost. Tom, however, insisted on paying for the cores >> himself. Problem solved. >> >> It is NEVER a good idea to modify the equipment, but it IS good to >> disable the antennas (that wiring) by adding ferrite chokes tuned to the >> transmitter frequency(ies). Tuning is accomplished simply by using the >> "right" ferrite mix and adjusting the number of turns through the core. >> >> Speaker cables are a very common antenna. Another excellent move is to >> replace parallel wire loudspeaker cables (zip cord, no matter how >> exotic) by twisted pair. #12 copper makes excellent speaker cable >> (there's a classic AES Paper by Prof. R. A Greiner, Dept of EE at U Wis >> about this), and twisting strongly rejects RF coupling. I have solved >> MANY cases of RFI by doing this. >> >> RFI causes and solutions are covered in considerable detail in >> >> http://audiosystemsgroup.com/RFI-Ham.pdf >> >> 73, Jim K9YC >> <snip> > > > > > > -- > View this message in context: > http://elecraft.365791.n2.nabble.com/OT-RFI-Issue-tp7571483p7571594.html > Sent from the Elecraft mailing list archive at Nabble.com. > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[email protected] > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html -- Walter Underwood [email protected] ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
