2-meter indoor antenna
Tim Simmons
indoors for a 2-meter antenna? The reason is due to living in an
apartment complex that will not allow external structures. Anything
information you can provide will be appreciated.
kc7gum
Paulo Teixeira
<tim...@primenet.com> wrote:
I've been hamming 2 mtrs from an apartment for the last 2 years.I've used
a 5/8's mag mount on my windowsill,wich worked quite well.The surface on
the sill is metal,wich helps out.While at a hamfest,a friend spoted for me
an older version of a Ringo antenna,wich I purchased for $5.After
cleaning it and tunning it for the middle of the band,it works as well as
an indoors antenna would work.Its just sitting on the inside,leaning
against the glass.I dont know exactly what model it is,but I guess its an
R5.Someone correct me on that if I'm wrong.
Of course,the degree of sucess on my part is also due to be living in a
area (Wahington,DC) that is covered whih a lot of repeaters and packet
nodes.
Best of luck for your setup
--
Paulo A. Teixeira "Free speech is the right to shout
N3...@WA3TAI.NOAM.MD 'THEATER' in a crowded fire."
Gallery's BBS 202-333-0407 - A yippie proverb
Jerry Gardner x323
I've been using a Larsen 1/4-wave NMO mount mobile antenna mounted on
top of a 4-drawer file cabinet for the last five years and it works
just fine. Repeaters up to 45 miles away are S9 or better. However,
I am about 600' above average sea level, which helps a bit.
Bart Rowlett
The classic of course is a magnet mount antenna stuck on a refrigerator
or windowsill. Over the years i've tried quite a few different 2 meter
indoor antennas and found a couple worth considering:
Full wave loop in window using alarm tape. Radio Shack sells conductive
tape and connection blocks for making burglar alarms which can be used
to make dipoles, folded dipoles, loops and phased arrays if your window
is large enough. I was originally worried about the effects of the
conductive aluminum windowsill but never found it to be a problem. In
the case of a full wave loop, the feedpoint impedance is around 100 ohms
which is nicely transformed to 50 ohms via a quarter wave of 75 ohm
coax such as RG-59. If you want vertical polarization you should feed it
in the center of a vertical side.
Twinlead J-Pole. Easy and cheap to fabricate but often is detuned when
in close proximity to walls, appliances etc.
If you have a large window available you might consider a vertically
polarized (non lazy) lazy H made from alarm tape or folded dipole
twinlead elements or an inverted Bobtail Curtain fed from the junction
between the center element and the feed.
Good luck.
bart wb6hqk
Lawrence *The Dreamer* Chen
A friend used to run with a twin lead J-pole hanging in the middle of his
bedroom....the computer/packet system in a different part of his appartment
to keep the computer noise out of the antenna.
I used, and still have a copper cactus (double style) hanging in the
stairwell. I also have a 5/8 mobile with in a base conversion kit...its
standing on the floor on its radials.
--
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Jeff DePolo
Here are a few ideas for apartment dwellers that have a decent-sized
window to work with:
1. You can make a halfwave dipole and fasten it to either the inside or
outside of a window using suction cups. You can get suction cups
at a craft store. Try to bring the feedline away from the dipole
at a right angle for at least 1/4 wave (preferably more) to keep
the pattern somewhat clean.
2. You can make a quad loop and stick it to the window the same as
above, or just use tape.
3. You can make loops, dipoles, ground planes, whatever you want
using foil burglar alarm tape. If you look around, you can also find
copper foil tape, which is great because you can solder right to it.
4. If you want a ready-to-go solution, buy a Larsen on-glass antenna
for 2m and stick it to your window. From any realistic distance, it
will be invisible (it's black), and the coax will be on the inside of
the window.
--- Jeff
--
-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
Jeff DePolo WN3A Twisted Pair: H:(215) 337-7383 W:387-3059 x300
dep...@eniac.seas.upenn.edu RF: 442.1 442.2 442.4 443.8 link system PL 3B
Claim to Fame: I got the first speeding ticket on the information superhighway
Mike Morris
>In article <3bknp4$h...@news.primenet.com>,
>Tim Simmons <tim...@primenet.com> wrote:
>>Does anyone have any good ideas about what kind of antenna to erect
>>indoors for a 2-meter antenna? The reason is due to living in an
>>apartment complex that will not allow external structures. Anything
>>information you can provide will be appreciated.
>>
>The classic of course is a magnet mount antenna stuck on a refrigerator
>or windowsill. Over the years i've tried quite a few different 2 meter
>indoor antennas and found a couple worth considering:
>Full wave loop in window using alarm tape. Radio Shack sells conductive
>tape and connection blocks for making burglar alarms which can be used
>to make dipoles, folded dipoles, loops and phased arrays if your window
>is large enough. I was originally worried about the effects of the
>conductive aluminum windowsill but never found it to be a problem. In
>the case of a full wave loop, the feedpoint impedance is around 100 ohms
>which is nicely transformed to 50 ohms via a quarter wave of 75 ohm
>coax such as RG-59. If you want vertical polarization you should feed it
>in the center of a vertical side.
>Twinlead J-Pole. Easy and cheap to fabricate but often is detuned when
>in close proximity to walls, appliances etc.
I used an on-glass j-pole made from alarm tape at one job... in fact I
had a 440mhz and a 2m on adjcent glass panels.
My father had an office with high ceilings, he used a 2m ground plane made
from an SO-239 and copper wire - I used some leftover 14ga to make it...
I used a leftover 6' piece of RG-58 to connect it to the old base
station, and circumstances required a 2' piece of rope to hang the
antenna center conductor element from a leftover swag hook in the ceiling.
It worked very well.
--
Mike Morris WA6ILQ | All opinions must be my own since nobody pays
PO Box 1130 | me enough to be their mouthpiece...
Arcadia, CA. 91077 |
ICBM: 34.12N, 118.02W | Reply to: mor...@grian.cps.altadena.ca.us
Robert Freitag
Hi there,
I am using a quad antenna for 2 m. It is part of a dualbd-quad ( means:a
quad in a quad.). It works very well.
Robert