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Author Topic: Larsen NMO2/70SH vs NMO2/70B?  (Read 1602 times)
WILLIATY
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Posts: 80




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« on: October 14, 2008, 07:55:03 PM »

I currently have a Larsen NMO2/70B on my roof. When I drive into the garage, it hits the garage door and makes a heck of a racket. It doesn't hurt the antenna or the roof any, but it does bent it over far enough I'm afraid to reverse out or shut the door. Quite a bit of the antenna is swept back into contact with the overhead door and I'm worried that it would "stub" if I just left it to its own devices, so I end up dis-mounting the antenna every time I go into the garage.

There's a version of the 2/70 called the 2/70SH, which has a spring base and is only 19" tall (vs 34" for the 2/70B). How much performance would I be losing by changing from the 2/70B to the 2/70SH?

Thanks!
Ty (KD8IVL)
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W3LK
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Posts: 5639




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« Reply #1 on: October 14, 2008, 08:10:31 PM »

My 270B (on a Ford Windstar) has been dragging on garage doors and airport parking garage beams for about 10 years now and is still going strong.

As for performance loss, for normal repeater operations you'll never know the difference with the shorter antenna.

73,

Lon - W3LK
Naugatuck, Connecticut
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A smoking section in a restaurant makes as much sense as a peeing section in a swimming pool.
K0BG
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Posts: 9868


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« Reply #2 on: October 15, 2008, 05:35:57 AM »

The only thing you have to careful of, is catching it in one of the seams of the door.

I use the twang of my NMO2/70BK to tell how far into the garage I am. Works better than the tennis ball I had before.

Alan, KØBG
www.k0bg.com
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N8EKT
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Posts: 371




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« Reply #3 on: October 16, 2008, 07:50:55 AM »

The shorter version you mentioned is little more than a 2 meter 1/4 wave.

And it's performance on 440 is terrible.

If you desire decent performance in a smaller package,
the comet B10 NMO at 12 inches in length gives slightly less performance than a 1/4 wave on 2 meters and decent 440 performance of a 1/2 wave.

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