On Thu,1/29/2015 11:18 AM, Tim Shoppa wrote:
A deep "4 inch box"? Add extension rings if necessary? Ganged outlet boxes?
Slide #6 in http://nccc.cc/pdf/CQP-RFI2013-2.pdf shows how I mounted a
20A line filter in deep multi-gang boxes. Each box is sized to hold a
single duplex outlet or switch. I've forgotten the correct name for
them, but they're in the big box stores, about $2 per section. All it
takes to gang them is remove one side cover of the end boxes and both
side covers of the interior boxes and screw them back together. I bought
these at Home Depot. I later found a cover for the rest of the box --
some of the less common stuff like multi-gang covers I had to buy online
from amazon, etc.
Another good way to do it is to buy a suitable length of ordinary
extension cord (same big box store), break it close to the male plug
connect the two ends to the line filter, going in and out of the box
with compression fittings, and winding a common mode choke on the longer
output side of the cable. I've done that with a cable where the output
went to a multi-output strip or 3-way split.
When you're wiring to the filter (and outlets) ALL THREE WIRES MUST be
connected on both sides.
Here's a link to ARRL's page about grow lights.
http://www.arrl.org/grow-light-rfi
It includes a link to line filters that W0IVJ and W0QE have developed.
From the spectrum sweeps, it's not clear to me that their filter goes
down below 40M.
73, Jim K9YC
_________________
Topband Reflector Archives - http://www.contesting.com/_topband
|