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Author Topic: 2M mag mount  (Read 719 times)
AB7JK
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Posts: 1




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« on: March 19, 2006, 02:18:41 PM »

Until I am able to obtain a 2M base antenna I want to use my 2M mag mount on the second floor of my house. Trouble is there is no magnetic/metallic surface to mount it on.

Is there a way to get around this to make the antenna usable in this situation?  AB7JK
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K0BG
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« Reply #1 on: March 19, 2006, 03:08:07 PM »

Save a bunch of money. Make yourself a simple dipole. You can attach it to small piece of wood to support it. Just make sure you set it up as a vertical dipole.

Alan, KØBG
www.k0bg.com
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W3LK
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« Reply #2 on: March 19, 2006, 04:10:47 PM »

cookie sheet
metal garbage can lid
very large pot turned updown down
metal trash can turned upside down
top of the 'fridge
top of the hot water heater

Where's your imagination?

73,

Lon - W3LK
Baltimore, Maryland
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A smoking section in a restaurant makes as much sense as a peeing section in a swimming pool.
WW5AA
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« Reply #3 on: March 20, 2006, 07:11:54 AM »

If nothing else use 4-1/4 wave wire radials.

73, de Lindy
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WB2WIK
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« Reply #4 on: March 20, 2006, 10:02:00 AM »

Top of the 'fridge is an excellent place.  Gets it up high above the floor, out of the way, and almost always magnetic material.  However, a file cabinet or something else made of steel with a large, flat surface area placed *near a window* will usually work better, because the whip's near the window.

A file cabinet on an upstairs balcony is even better, since then the whip's outside.

WB2WIK/6
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KE4SKY
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« Reply #5 on: March 20, 2006, 12:21:58 PM »

Better still, make (or buy) a radial kit adapter for your mobile antenna, then use a couple of hose clamps to attach the antenna to some sections of TV mast and and anchor the TV mast to the balcony oir rain gutter, to elevate it well above the roofline and then hook up to it.
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AB0RE
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Posts: 293




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« Reply #6 on: March 22, 2006, 09:51:13 PM »

When traveling I've had great luck using an ironing board for my mag mount.  Simply remove the cloth cover, plop the mag mount in the center of the ironing board, move the ironing board over by the window, and you're good to go.  

As others mentioned, garbage can lids, cookie sheets, etc, also do the trick.  A larger ground plane that extends at least 1/4 wave in all directions from the mag mount (~19") is preferred.

Or perhaps it'd be easier to make your own 2M antenna.  You can head to Rat Shack and get an SO-239 connector.  Then head to the hardware store and get some #12 THHN Solid Conductor wire and some small nuts/bolts that will fit through the outer holes of the SO-239.  Solder a 19" piece of wire to the center conductor of the SO-239.  Then use the small hardware to attach a 19" piece of wire to each of the 4 outer holes.  Slope the 4 radials down to a 45 degree angle, hook up your coax, and you're good to go.  

Good luck and 73,
Dan / ab0re
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W6DPS
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« Reply #7 on: March 24, 2006, 03:31:22 AM »

I have used a file cabinet with some success.

I have had better success with a drip pan--the kind you put under a car to catch oil drips.  About 3' by 5', made of galvanized steel so the magnet work fine.

Just remember that what ever you use needs to be tied ot your ground system.  The magnet physically holds the antenna, but doesn't do much to establish a ground plane if the surface it is on is not grounded.

Dave
W6DPS
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N4VNV
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« Reply #8 on: March 29, 2006, 07:15:39 AM »

Large Pizza Pan Always Works For Me.
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WB6BYU
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« Reply #9 on: March 29, 2006, 12:39:52 PM »

> Just remember that what ever you use needs to be tied ot your ground system.
> The magnet physically holds the antenna, but doesn't do much to establish a
> ground plane if the surface it is on is not grounded.


Umm...  No.

The "ground plane" plus the quarter wave whip makes a
complete antenna, independent of any connection to any
other "ground".  The mag mount capacitively couples to the
metal plate it is mounted on.  That plate need not be
connected to anything else to form an effective ground plane.
In fact, from the second floor it is physically impossible
to "ground" anything on 2m to earth "ground" because any
connecting wire will be a wavelength or more long and
will act as an antenna rather than a ground wire.

You can take the lid of a tin can a bit larger than the
bottom of the mag mount and solder 4 radial wires to it
to make a radial add-on kit.  Just stick the mag mount
to the can lid and you are set to go.
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