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Author Topic: Wideband dual-band antenna  (Read 1789 times)
W9BNB
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Posts: 3




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« on: March 02, 2004, 12:36:12 PM »

Has anybody used a Larsen NMO2/70SH for wideband dual-band applications? I'm looking for an antenna that will perform on 2m, 440, and GMRS. In the limited technical info I've found, the NMO2/70SH seems to have a large bandwidth (up to 480MHz at SWR<2:1). Any firsthand accounts? I've also looked at the CA-2x4SR but would prefer something smaller.

Thanks and 73,

Brandon
W9BNB/WPQX785
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N3ZKP
Member

Posts: 2008




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« Reply #1 on: March 02, 2004, 01:02:29 PM »

How are you planning to connect two radios to this one antenna?

Please don't say you are going to use you 2/440 rig on GMRS, as that isn't legal. Ham gear isn't type certified for GMRS - you will need a separate GMRS radio.

Lon
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K0BG
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Posts: 10248


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« Reply #2 on: March 03, 2004, 10:56:00 AM »

Lon is correct about the rules.

I own that very antenna. It is mounted in the middle of my trunk. Its bandwidth is rather broad, but at 480 Mhz, the VSWR is over 3:1 according to my MFJ 269.

Alan, KØBG
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W9BNB
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Posts: 3




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« Reply #3 on: March 03, 2004, 12:08:31 PM »

I am very aware of the rules.

I am actually running a VHF Motorola M1225 for APRS and a UHF Motorola CDM1550 for 440/GMRS through a Comet duplexer.
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KE4SKY
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« Reply #4 on: March 04, 2004, 05:11:00 PM »

What I carry for a spare or loaner antenna is a www.hamstick.com cellular lookalike 1/4 wave dual-band whip with the pigtail squiggle in the middle.  While only unity gain it is very broad banded, and very compact and will fit in a briefcase.

While optimized for the 2m and 70cm ham bands, VSWR swept with my MFJ469 is also 2:1 or less on VHF-hi and Marine VHF, as well as on GMRS and the public safety 460-470 band.

Not bad for a $20 antenna with 3" mag-mount and coax.
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W9BNB
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Posts: 3




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« Reply #5 on: March 08, 2004, 11:37:31 AM »

Thanks, KE4SKY. That sounds exactly like what I am looking for at half the price of the Larsen.

73...
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WPZU357
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Posts: 2




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« Reply #6 on: March 25, 2004, 11:06:05 AM »

I just installed the CA-2x4SR on a diamond K600M mount and tested it with a diamond SX-600 SWR meter.    SWR is 1.25 at 462Mhz and 1.4 at 467Mhz out of the box!! Incredible bandwidth.    If you are looking to use one antenna for 2m, 70cm, and GMRS you would do well to choose this antenna.    It is a 3 times 5/8ths wave at 446Mhz with 6.2db gain, and at 37" it is not excessively long and looks good mounted.   I have read that it even works well (SWR <1.5) at 220Mhz!   A true all bander that lives up to the manufacters wide band labeling.     Good Luck!
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