FW: Basement QRN
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When I put my shack together I put in some halogen lighting from an overhead
shelf that looked pretty cool till I turned on the lights. Talk about noise. It was like a blanket . I switched off the lights and it was gone. These were the low voltage halogens. By the way, I just ordered my K3 yesterday. I just couldn't stand to hear about all the fun I was missing. Werner N8BB _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
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You must have had a noisy switcher power supply for those low-voltage
halogens. The halogen bulb is simply another conventional bulb with a filament and halogen gas is added to prevent the metal filament from evaporating. 110 V halogens would probably have been FB. Jerry W4UK At 05:42 PM 3/9/2008, Denise&Werner wrote: >When I put my shack together I put in some halogen lighting from an overhead >shelf that looked pretty cool till I turned on the lights. > >Talk about noise. It was like a blanket . I switched off the lights and it >was gone. > >These were the low voltage halogens. > >By the way, I just ordered my K3 yesterday. I just couldn't stand to hear >about all the fun I was missing. > > > >Werner N8BB > >_______________________________________________ >Elecraft mailing list >Post to: [hidden email] >You must be a subscriber to post to the list. >Subscriber Info (Addr. Change, sub, unsub etc.): > http://mailman.qth.net/mailman/listinfo/elecraft > >Help: http://mailman.qth.net/subscribers.htm >Elecraft web page: http://www.elecraft.com _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
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When I had a lot of lo-vol down lighters fitted, I paid a little more and
have torroidal transformers fitted, instead of the cheaper switching 'transformer'. It means you can't dim them - but they are in places where I don't need to anyway. On 09/03/2008 22:52, "Jerry Flanders" <[hidden email]> sent: > You must have had a noisy switcher power supply for those low-voltage > halogens. The halogen bulb is simply another conventional bulb with a > filament and halogen gas is added to prevent the metal filament from > evaporating. 110 V halogens would probably have been FB. > > Jerry W4UK > > At 05:42 PM 3/9/2008, Denise&Werner wrote: >> When I put my shack together I put in some halogen lighting from an overhead >> shelf that looked pretty cool till I turned on the lights. >> >> Talk about noise. It was like a blanket . I switched off the lights and it >> was gone. >> >> These were the low voltage halogens. >> >> By the way, I just ordered my K3 yesterday. I just couldn't stand to hear >> about all the fun I was missing. >> >> >> >> Werner N8BB >> >> _______________________________________________ >> Elecraft mailing list >> Post to: [hidden email] >> You must be a subscriber to post to the list. >> Subscriber Info (Addr. Change, sub, unsub etc.): >> http://mailman.qth.net/mailman/listinfo/elecraft >> >> Help: http://mailman.qth.net/subscribers.htm >> Elecraft web page: http://www.elecraft.com > > _______________________________________________ > Elecraft mailing list > Post to: [hidden email] > You must be a subscriber to post to the list. > Subscriber Info (Addr. Change, sub, unsub etc.): > http://mailman.qth.net/mailman/listinfo/elecraft > > Help: http://mailman.qth.net/subscribers.htm > Elecraft web page: http://www.elecraft.com -- There is no pillow so soft as a clear conscience. -French proverb _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
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In reply to this post by Jerry Flanders
I don't know if anyone will find this interesting or not, but I found
a noisy switcher powering the electric blanket in the master bedroom-- several rooms away from the shack, and on the opposite side of the house from my HF antennas. It's a 4-year-old JC Penney model that advertises the fact that it's running only low-voltage DC through the blanket to avoid bathing you in an AC field. You don't hear anything from it when you first turn it on, but as soon as it reaches the thermostat's set temperature, it begins to pulse on and off. When in the "off" mode, the switcher is apparently experiencing a high EMF condition inside the switcher "brick" unit-- since it is not under the load of the resistive wiring then, and that high-voltage moment is when all the RF radiation happens. It's mostly just a problem on 80 meters, since I can hear a definite peak in the distinctive broadband noise right around 4 MHz. An interesting side note is that I can reliably turn the blanket electronics completely off by transmitting a few dits and dahs at anything greater than about 20 watts on 80 meters! Great design, huh? And, no, I haven't been able to "fix" it yet by wrapping all the cords in a bunch of ferrites. I'm driven more by curiosity than anything else, but I'm going to open it up and make it RF-proof when I have time. 73, Dave K7DAA http://www.k7daa.com On Mar 9, 2008, at 3:52 PM, Jerry Flanders wrote: > You must have had a noisy switcher power supply for those low- > voltage halogens. The halogen bulb is simply another conventional > bulb with a filament and halogen gas is added to prevent the metal > filament from evaporating. 110 V halogens would probably have been FB. > > Jerry W4UK > > At 05:42 PM 3/9/2008, Denise&Werner wrote: >> When I put my shack together I put in some halogen lighting from an >> overhead >> shelf that looked pretty cool till I turned on the lights. >> >> Talk about noise. It was like a blanket . I switched off the lights >> and it >> was gone. >> >> These were the low voltage halogens. >> >> By the way, I just ordered my K3 yesterday. I just couldn't stand >> to hear >> about all the fun I was missing. >> >> >> >> Werner N8BB >> >> _______________________________________________ >> Elecraft mailing list >> Post to: [hidden email] >> You must be a subscriber to post to the list. >> Subscriber Info (Addr. Change, sub, unsub etc.): >> http://mailman.qth.net/mailman/listinfo/elecraft >> >> Help: http://mailman.qth.net/subscribers.htm >> Elecraft web page: http://www.elecraft.com > > _______________________________________________ > Elecraft mailing list > Post to: [hidden email] > You must be a subscriber to post to the list. > Subscriber Info (Addr. Change, sub, unsub etc.): > http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/subscribers.htm > Elecraft web page: http://www.elecraft.com _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
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