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Author Topic: Which mobile antenna is better for EmComm? Dual, or 2m 5/8?  (Read 13304 times)
K7RNO
Member

Posts: 279




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« Reply #30 on: April 06, 2013, 03:23:27 PM »


Which model of the 2/70 do you have?  I would go with a Larsen 2/70


All I can say is Larsen 2/70. It is a used item and there are the remains of an old sticker visible that just says 2/70.

As I decided earlier, I am running with the 2/70 and have the 5/8w in the car for when I might want that instead.
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73,
aRNO
NAQCC #6870, SKCC #11131
KA4NMA
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Posts: 357




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« Reply #31 on: April 06, 2013, 10:11:15 PM »

Check out Alan's website, http://www.k0bg.com/ .   It is the best one on mobile radio.  Be sure to read the grounding section and the vhf options.  He has some good info on the Larsen 2/70  Remember the 2/70 is a 1/2 not 1/4 wave.  Check out the links he provides for a study on the different antenna's. 

Randy ka4nma
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K7RNO
Member

Posts: 279




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« Reply #32 on: April 09, 2013, 01:42:58 PM »

Did a little more research on what I have. It may even be a hodgepodge of elements from different models.

My whip has a black cylinder at a bit above the middle. It looks like that of the 2/70SH (but without a bottom spring).

My base is tall and looks like that of the 2/70B but it is beige, not black.

Most importantly, it gets my HT into our local repeaters, the farthest one 34 miles away.
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73,
aRNO
NAQCC #6870, SKCC #11131
K1CJS
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Posts: 6061




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« Reply #33 on: April 10, 2013, 04:43:15 AM »

'BJM,  That sounds like a Chinese knockoff of a Diamond antenna I once had...   Grin
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K7RNO
Member

Posts: 279




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« Reply #34 on: April 11, 2013, 03:22:56 PM »

'BJM,  That sounds like a Chinese knockoff of a Diamond antenna I once had...   Grin

Why so?

It is old, like of a vintage where the Chinese didn't know yet how to make good copies.
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73,
aRNO
NAQCC #6870, SKCC #11131
K1CJS
Member

Posts: 6061




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« Reply #35 on: April 12, 2013, 05:29:38 AM »

Why so?

It is old, like of a vintage where the Chinese didn't know yet how to make good copies.

I don't recall the model number, but about a decade ago, I bought and used a Diamond dual band which broke when I went under a tree branch that was lower than I thought it was.  I ordered another (to use the parts) which was advertized to be the same as but not made by Diamond and got an antenna with a beige base and a black coil.  (It was the coil I needed and the one on that knockoff looked exactly the same)  I replaced the coil and antenna worked fine after, so the rest of the replacement went into the junk box.  I just remember that beige base coil looked totally different than the one on the Diamond--and I don't mean just the color.  73!
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K7RNO
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Posts: 279




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« Reply #36 on: April 12, 2013, 07:59:03 PM »

cjs, I hear you.
Going by the images I find online, my base has the same shape and size that Larsen's black base of today has. Also, the separate gaskets that Larsen sells for their antennas fit perfectly. Knock-off or not, it works well and looks like it has weathered many a storm and tons of attempts to break (bend) it.
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73,
aRNO
NAQCC #6870, SKCC #11131
VE7DQ
Member

Posts: 177




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« Reply #37 on: April 13, 2013, 12:31:08 PM »

The original Larsen NMO 2/70 had an enclosed phasing coil, no base spring and a grey base, which usually fades to some indeterminate colour in the sun.  Sound familiar?  I have the same antenna on one of my older vehicles. 

I prefer the enclosed phasing coil to the open coil; the whip doesn't seem to be as boingy as the open-coil version on the wifoid's Honda.
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