When I take this thing apart there is a toridal transformer (might be an
autotransfomer) and a "dimming coil" (a small toroid wound choke). I don't see
any active componenets or any encapulated block...
Very strange.
73, Bill
On Feb 20, 12:53pm, Hare,Ed, W1RFI wrote:
> Subject: RE: [RFI] RFI from low voltage lighting?
> Hi, Bill,
>
> The problem is that the power supply is probably a switch-mode supply.
> These can generate a lot of broadband noise. Some hams have replaced the
> power supply with an analog device. It may also be possible to install a
> brute-force filter, such as the Radio Shack catalog #15-1111 or the filters
> sold by Industrial Communications Engineers. (See
> http://www.arrl.org/tis/tisfind.html to look up ICE's contact info.)
>
> Under the rules, these are incidental emitters. See
> http://www.arrl.org/tis/info/part15.html for info on various types of
> unlicensed emitters of RF.
>
> 73,
> Ed Hare, W1RFI
> ARRL Laboratory Supervisor
> 225 Main St
> Newington, CT 06111
> Tel: 860-594-0318
> FAX: 860-594-0259
> Internet: w1rfi@arrl.org
> ARRL Web: http://www.arrl.org
> ARRL Technical Information Service: http://www.arrl.org/tis/
>
>
>
> -----Original Message-----
> From: Bill Putney [mailto:billp@dune.wwpc.com]
> Sent: Tuesday, February 20, 2001 11:58 AM
> To: rfi@contesting.com
> Subject: [RFI] RFI from low voltage lighting?
>
>
>
> I don't understand this. I have a few Alfa low voltage lights (ceiling
> mounted
> transformers) around the house. They seem to be broad band HF noise
> generators.
> They aren't on dimmers. It seems to me that a 120:12 volt transformer and a
> halogen lamp shouldn't be an RFI source. Any ideas?
>
> 73, Bill
>
> --
> =====================================================================
> # Bill Putney - WB6RFW | My repeater:443.400 Mhz-100 Hz #
> # WWPC | It's not open, it's not closed,#
> # 5780 Balmoral Drive | it's controlled. It's open for #
> # Oakland, CA 94619 | membership (which is free...). #
> # billp@wwpc.com - (510)531-2412 | Go figure... #
> =====================================================================
>
> --
> FAQ on WWW: http://www.contesting.com/FAQ/rfi
> Submissions: rfi@contesting.com
> Administrative requests: rfi-REQUEST@contesting.com
> Questions: owner-rfi@contesting.com
>-- End of excerpt from Hare,Ed, W1RFI
--
=====================================================================
# Bill Putney - WB6RFW | My repeater:443.400 Mhz-100 Hz #
# WWPC | It's not open, it's not closed,#
# 5780 Balmoral Drive | it's controlled. It's open for #
# Oakland, CA 94619 | membership (which is free...). #
# billp@wwpc.com - (510)531-2412 | Go figure... #
=====================================================================
--
FAQ on WWW: http://www.contesting.com/FAQ/rfi
Submissions: rfi@contesting.com
Administrative requests: rfi-REQUEST@contesting.com
Questions: owner-rfi@contesting.com
|