Re: [loopantennas] Digest Number 520
> I live in a mobile home and I am not allowed any type of outdoorIf your mobile has metal siding or roofing, you are going to be very
> I want to know if those small loop antennas from MFJ really work. The
> price is high but if it works then I don't mind paying.
> I like the idea of it being very small but I am also worried about how
> well it will work or not work because the next mobile home is only 15
> feet from my home.
> Has anyone on this list owned or used on?
> I'm in no rush but MFJ does make some out of the world claims.
> The mobile home has three dimmer switches and an electric heater.
> They do generate QRN.
> Will this affect the operational quality of the small loop?
> Thank you for reading my post
disappointed. Even if just wood construction, using it indoors is
not going to be as good as outdoors, just judging from my experience
with receiving. How about a whip or mast antenna, even one like a
mobile ham radio antenna? Like one of the 'Hamstick' single banders
for cars? These are not very prominent. Otherwise some people have
advised using some kind of flagpole, something with a flag on it, to
make it more acceptable and disguise its main purpose. Another thing
that has been done is to have the mobile antenna on top your parked
car, like with a mag mount, and then snake (sneak) the coax into your
home. What i would do before spending $400+ on the MFJ loop, is
to try a 'Hamstick' or even a wire dipole laid on the (nonmetallic) roof
of your unit, or if the side is wood, a thin wire dipole held off the wall
by push pins. Think of yourself as a spy. You will need an antenna
tuner probably, or have to prune the antenna from its book length,
because of its proximity to ground and the building surface. Also
if you use a horizntal wire instead of a vertical type, your angle of
transmission is going to be much higher than optimum for DX, but
you will do fine for state-wide contacts and farther out to maybe?
1000 miles. In one apartment i lived in, i loaded up the metal rain
gutters and down conduit, with an old Navy transmitter that could
load random wire antennas, and had this kind of range.
If you do use a vehicle mobile antenna, another idea is to only
deploy it at night. Of course, you will have to make sure you
are not getting into the neighbor's TV or audio equipment, and
you may have to limit your transmit power. The only bad
thing now is, there's a whole lot more noise sources about, from
computers to light dimmers. You will have to turn your controlled
lights full-on or full-off to get rid of the terrible, terrible pulse noise.
If your neighbor has them too, you are really out of luck on any
band from maybe 10 or 7 MHz down. A mag loop like the MFJ
will diminish the noise quite a bit. I have found in real noisy
environments on the AM-BC band, using only the radio's
internal loop will allow reception of distant AM stations that
with even a short indoor whip or wire antenna, was impossibly
noisey. Good luck - with some ingenuity i'm sure you can figure
out a solution. The noise is going to be your worst problem.
If you can deal with that, some kind of basic but hidden wire
antenna should get you on the air. -Hue Miller