Welcome! Log In Create A New Profile

Advanced

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

February 09, 2015 11:44AM
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 641 February 08, 2015 03:25PM

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

ThaDood 443 February 09, 2015 11:44AM

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

jtart 356 February 09, 2015 02:20PM

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

jtart 403 February 09, 2015 04:57PM

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

ThaDood 431 February 10, 2015 12:18PM

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

ff 335 February 10, 2015 01:50PM

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

jtart 367 February 11, 2015 07:55AM

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

ff 372 February 11, 2015 09:26AM

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

jtart 430 February 11, 2015 06:46PM

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

jtart 352 February 13, 2015 11:26AM

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

jtart 411 April 05, 2015 07:47PM

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

Radio Animal 365 April 07, 2015 01:46AM



Sorry, only registered users may post in this forum.

Click here to login