All, 2 things:
1. Some have questioned my sanity in my goal to design and build a modern, more efficient linear power supply. When I look at the material on the subject, everyone who has published is making a mad dash into switching supplies in a desire for light weight and efficiency. Honestly, I don’t care if a PS weighs 20 lbs. if it lives on my desk. I want something that is electrically quiet, reasonably efficient and doesn’t have a noisy fan. 2. I just received a shipment of the Finally light bulb. They’re wonderful!!! broad-spectrum light. Generally cool, amazingly better than any other option. They use magnetic flux to excite the medium inside to glow. What I do NOT yet know is what amount of noise they generate. Simply turning on my TS-940S there is no increase in the total noise and I can’t hear the lamp switched on and off again in the receive audio. www.finallybulb.com <http://www.finallybulb.com/>. For those who doubt my sanity for other reasons, go right ahead :) Dr. Horowitz (The Art of Electronics) is advising on my PSU project. 73 Bill N4HPG > On Jul 19, 2015, at 2:02 PM, Ravi Ratnala via BVARC <[email protected]> wrote: > > Good lesson Jeff - thanks for sharing. > > It's amazing just how much noise power supplies / step-down AC-DC converters > can generate. One of the more insidious offenders (and one which is growing > in ubiquity) is the 120 VAC Edison screw base LED light bulb. Many of these > are made in China, or otherwise cheaply, and are among the worst offenders at > screaming RF noise. A single one can pollute an entire neighborhood, or so > I've read. Again, it's the cheaply made AC-DC converters in these things > that generate the noise. It's why, at least for now, I'm sticking with CFLs > as a less-offensive alternative (never thought I'd be saying that!). > > We as HAMs should unite and get the word out on these things, maybe the FCC > will actually pay attention and do something about them - though I ain't > holding my breath. > > 73, > KF5YHP > > Sent from my iPhone > > On Jul 19, 2015, at 1:15 PM, Jeffrey Carson via BVARC <[email protected] > <mailto:[email protected]>> wrote: > >> I recently relocated my shack to a 3rd bedroom and decided to build a new >> computer as I had a lot of the components laying around. One of the >> components was a 750w power supply that I got for next to nothing on a black >> friday deal at fry's. >> >> Long story short, the power supply was causing a LOT of noise on 20 meters >> while using my Softrock Ensemble 2. I bought a higher end modular power >> supply and the interference went to nothing on the spectrum/waterfall! >> >> I wish i'd taken a screen shot of the waterfall before I swapped the power >> supply to show how big of a difference there was. Lesson here is don't go >> too cheap on the power supply if you're going to be using an SDR. >> >> 73 >> >> KF5ONT >> Jeff >> _______________________________________________ >> BVARC mailing list >> [email protected] <mailto:[email protected]> >> http://mail.bvarc.org/mailman/listinfo/bvarc_bvarc.org >> <http://mail.bvarc.org/mailman/listinfo/bvarc_bvarc.org> > _______________________________________________ > BVARC mailing list > [email protected] > http://mail.bvarc.org/mailman/listinfo/bvarc_bvarc.org Bill Crowell [email protected]
_______________________________________________ BVARC mailing list [email protected] http://mail.bvarc.org/mailman/listinfo/bvarc_bvarc.org
