Sorry Chuck, just can't resist -
The harassing XYL - or - the wanting him to come to bed?
73's and good luck!
[mailto:email@example.com] On Behalf Of Chuck Smallhouse
Sent: 29 April, 2014 14:29
To: Bob Kocisko
Cc: EME Bounce Net; Moon-Net
Subject: Re: [Moon-Net] Question About Interference From Different Types of
I apologize for the previous e-mail . It had a lot of typos and wasn't
complete. The result of a very late night and a harassing XYL, wanting me
to come to bed. Something that you have to look forward to Bob !
I have some rather biased advice(experience from several
installations) when it comes to wiring a ham shack/workshop. First if you
feel confident enough, you can save a great amount of money by at least
wiring all the wall mounted stuff yourself, before the wallboard/sheet rock
is installed. What you really want is probably
10 times more outlets than the electrician has ever seen before, in one room
of that size. I always also do an interesting control function. From where
the 240 VAC comes into an outlet(s), I run a 3 wire (and ground) 240 VAC
cable, to a wall mounted outlet box that has a pair of mercury wetted high
power relays (~50-100A+) in it, that are energized by a 115 wall switch at
your entrance door. Between that switch and the mercury wetted ones, you
can control all the outlets, 240 and 120 VAC, that you will not want to
be on continuously, in your absence. This doorway located switch
will also act as a safety or panic/emergency switch. The other two
switches by the entrance door control the lights and the overhead
fans and/or the AC. Do not use wall mounted variable lighting or
fan switches, as they can be RFI generators, Some of these different types
of additions, for your needs , might not be appreciated by your electrical
inspector, so you can add the external relay junction box, that's plugged
into your 240 VAC socket later, A lot of external wiring with Romex and
wall boxes, can be done after the fact. All should be to code (logical),
but probably won't be in the inspector's book !
You need to have many, many outlets around on all the walls, both of the
"switched on", and of the " continuously on" types. I use
colored covering wall plates to ID them. An over abundance of both types
are needed behind your operating positions, and also behind your "test
bench". Also don't skimp on placing 240 VAC outlets around the room, at
least one on every wall.
Rationale: There are some items that you want to run continuously in your
absence, like clocks and frequency stds, etc., and most others that you can
switch on/off, with one switch at the door, when you are entering or
As far as overhead lighting goes, numerous hanging, four bulb, 4 foot long,
florescent fixtures provide more than adequate light and are generally long
lived, I haven't yet really detected any RFI from mine. Here again just
install 120 VAC outlet boxes in the ceiling, where you think that you may
want to later install them. Although they now are replacing the transformer
type of ballasts with electronic ones. that are supposedly longer lived, but
they may be suspect RFI generators.
In any case don't use any CFLs, as they can not only emit an audible tone
but also possible RFI, and in my experience, they don't last any
longer than incandescent bulbs. LED bulbs are the way to go, but
you need to test each brand for possible RFI. The CRE brand sold by Home
Depot (at least through their catalog) so far, I haven't had any trouble
with. Multiple LED fixtures are often interfaced with single electronics
enclosures, that have been a great source of problems. .
In all cases GET/INSIST on a guarantee from your supplier, that you can
return all light sources that generate RFI.
BTW, you may want as much as a 200A service to your shop, I do, to my radio
room and a 100A to my remote EME shack, 400A to the property, including the
I can clarify more later, if you desire.
73, Chuck W7CS
At 09:06 PM 4/28/2014, you wrote:
At my new QTH in AZ, I'm in the process of laying
out an enclosed
operating room (not for surgeries but for my ham radio, hi, hi). It
will be 320 sq ft & located inside a metal insulated 1500 sq ft
workshop. I'm really excited abt finally having a comfortable room for
a couple of different stations as well as test bench with various test
equipment. The framing & exterior siding is planned to be done May
16-19. The electrical wiring will take place after that is completed.
I had an electrician here today to look at my sketches for location of
various electrical outlets & a lighting plan consisting of several T8
fluorescent fixtures & several adjustable bullet lights.
I watched one You Tube video (think it was fm EU) which showed how some
different LED lights caused interference which was quantitatively
measured. Some bulbs caused no interference, some a moderate amount &
some were vy high levels. The electrician said the newer T8
fluorescent bulbs use an electronic ignition similar to LEDs which
causes me concern. He suggested an alternative approach of using
several track lighting strips with halogen bulbs. I know they're not
as efficient as LEDs or fluorescents but suspect they also don't
So, my question for this group is what experience hv you had with LEDs,
halogens, &/or T8 fluorescents generating interference in the HF, VHF,
UHF & SHF spectrums?
Tnx & vy 73,
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