[R-390] Re: Line filter issues?

[Roy Morgan]

At 11:37 PM 8/5/03 -0400, you wrote:
>Yet another update on this project;    ...   a dimmer-type toggle switch 
>in our kitchen, ...this definitely doesn't explain how the transistor 
>radio was formerly able to pick up buzzing from the 390A unless it was 
>unplugged from it's power source.

Adam,

It Could Be that the buzzing has always been from that dimmer, and the 
power cord on the R-390A, with it's line filter working, was acting as an 
antenna to radiate the noise coming in from the power line.

ALL dimmer type devices are suspect: touch-lamps, floor standing lamps with 
dimmers, wall mounted dimmers, even halogen lamps (some of them have a 
diode in their base to reduce the wattage consumed.)  Touch lamps are 
notorious for causing trouble because they make the RFI even when not lit.

You will learn a lot about RFI control if you make attempts to quiet such 
devices by the use of inductors and capacitors.

Roy

- Roy Morgan, K1LKY since 1959 - Keep 'em Glowing!
7130 Panorama Drive, Derwood MD 20855
Home: 301-330-8828 Work: Voice: 301-975-3254,  Fax: 301-948-6213
roy.morgan@nist.gov -- 

--- StripMime Report -- processed MIME parts ---
multipart/alternative
  text/plain (text body -- kept)
  text/html
The reason this message is shown is because the post was in HTML
or had an attachment.  Attachments are not allowed.  To learn how
to post in Plain-Text go to: http://www.expita.com/nomime.html  ---