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Re: Need help IDing the source of odd noise...

February 09, 2015 12:44PM
Well, here's a problem that I induced upon myself. I bought one of those $200.00 APC UPS power back-up systems, which it very essential where I am. However, about every minute it pulses a charge to the batteries and that pulse rips into LF, MW, HF, and even into lower VHF. The fundamental FREQ seems to be on 67KHz with multiples there after. I've reduced those emissions with CAP's and chokes, but I can't believe that they would allow something that invasive to be sold on the consumer market. Well, then again, yes I can. However, it's not a warbble sound, but an AC BURRRRRRRRRRRRRRRRRRRRRRR sound that rips at + S60/9 at LF. I'm not saying that's what you have, but it's possible that someone bought a cheap UPS and you're hearing that from a few hundred yards away. Also, these new smart TV's radiate RF crap like crazy, even when off, which they never really are, but on a stand-by. If I remember, you still have an ATS-909 portable. You might want to take a walk with it and DF your source. That's what I've had to do with a septic UV light PS. It ripped a BZZZZZZZZZZZZZZZZZZZZZ throughout the entire HF spectrum and it's buried out in the yard. It has an RF invasive switching power supply and what I did (When I DF'ed it.) was to put a 1uF 400V CAP across the PS DC terminals and that worked great. So, I hear ya. This is an on going battle.
Subject Author Views Posted

Need help IDing the source of odd noise...

jtart 590 February 08, 2015 04:25PM

Re: Need help IDing the source of odd noise...

ThaDood 358 February 09, 2015 12:44PM

Re: Need help IDing the source of odd noise...

jtart 312 February 09, 2015 03:20PM

Re: Need help IDing the source of odd noise...

jtart 373 February 09, 2015 05:57PM

Re: Need help IDing the source of odd noise... Security Systems?

ThaDood 360 February 10, 2015 01:18PM

Re: Need help IDing the source of odd noise...

ff 309 February 10, 2015 02:50PM

Re: Need help IDing the source of odd noise...

jtart 342 February 11, 2015 08:55AM

Re: Need help IDing the source of odd noise...

ff 334 February 11, 2015 10:26AM

Re: Need help IDing the source of odd noise...

jtart 401 February 11, 2015 07:46PM

Re: Need help IDing the source of odd noise... update

jtart 306 February 13, 2015 12:26PM

Re: Need help IDing the source of odd noise... update

jtart 316 April 05, 2015 08:47PM

Re: Need help IDing the source of odd noise... update

Radio Animal 333 April 07, 2015 02:46AM



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