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Author Topic: Diamond BB7V  (Read 1448 times)
NR6R
Member

Posts: 20




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« on: September 19, 2006, 09:38:47 PM »

Does anyone have any experience with this antenna? Can this really work without radials? Is it worth $400? Also, thanks to all who responded to my G5RV Junior question.
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W3LK
Member

Posts: 5639




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« Reply #1 on: September 20, 2006, 05:00:09 AM »

The antenna is essentially a resistive network across the output with a vertical radiator attached to one leg. It WILL work, but so will a light bulb.

Is it worth $400? Not in the least. There are real antennas out there that will do the job 100 times better, with a proper installation.

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.
KC8VWM
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Posts: 3119




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« Reply #2 on: September 20, 2006, 09:18:58 AM »


I am always suspicious of the performance of *ANY* antenna that claims all band, no gaps band coverage.

For example, I have a dummy load in the shack that has all band, no gaps coverage for that matter.


Basically what you are working with here is a 22 foot ground mounted radiator. It doesn't matter what brand name the raditor is, it's still going to be a 22 foot radiator either way we look at it.

So the question comes down to "how well does it work?"

This is typically going to be based on a persons individual and emotional "opinion" rather than fact in most cases.  

...Does it work? Yes, probobly.

I suspect performance is not going to be too bad on the upper HF bands and it will likely "function" on the lower HF bands.

When getting opinions on the performance of this particular antenna it's important that they indicate  the particular band they are giving you the opinion about.

The other side of the "does it work" coin could be interpreted as how "easy" it might be to setup and use. For example, "it works" for people who have a need for an antenna who live in an antenna restricted enviroment. "It works" for people who need a collapsable and portable antenna on an RV or if they are looking for a lightweight and portable telescopic QRP antenna.

Is it worth $400 buck for that convenience? ..Well that just depends on your individual circumstances.

If it's for your backyard and it's going to be a permanent installation, then I will say you should save your money. If you want it to install it on an RV, a collapsable $400 antenna investment is  probobly a good choice.

73
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N6AJR
Member

Posts: 9908




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« Reply #3 on: September 20, 2006, 11:06:19 AM »

build your own for $10 -$15

http://www.ku4ay.net/dipole.html
http://www.qsl.net/kd7rem/antdipole.htm
http://www.hamuniverse.com/multidipole.html
http://www.angelfire.com/nb/ni4l/ni4ldipole.html
http://www.arrl.org/tis/info/pdf/9611073.pdf
http://www.geocities.com/n2uhc/2banddipole.html
http://www.qsl.net/na4it/fandipole.html
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KD6IQS
Member

Posts: 3




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« Reply #4 on: May 15, 2007, 06:48:28 AM »

Hello,

Yes, I purchased one of the BB7V's.

I have several comments to make about it.

As far as assembly is concerned, it was moderately easy, however, the
screws that are provided do NOT seem to be machined well and don't
easily fit into their respective screw-holes. I had a heck of a time
getting the screws to fit all the way (especially those at the top of
the antenna). And yes, it is pretty obvious as to which screws go
to which holes.

But once I got the antenna upright and tested it out, it tunes up
VERY quickly!! My first attempt was on 20m and I doubt if the tuner
even took as long as ten seconds to get the antenna tuned.

The quick tuning seemed to be pretty consistent across the bands
I tested (75/80, 40 and 20).

Since this atenna is rated down to 2MHz, I tried tuning it on the
160m band and that's when it didn't tune up well.  So I'm not
sure how well it will perform down on 160m.

But I did get a decent contact on 75m with someone about 200 miles
from me.

All in all, I'd say this is a pretty good antenna in spite of the poor
tooling and machining of the screw-holes. It assembles easily
and tunes even more easily. I needed a vertical antenna that didn't
need radials and the BB7V came to the rescue. I just wish it weren't
so bloody expensive!!!

After I've had it a while longer and had a chance to put it through
its paces, perhaps I'll post an official review of it.
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K6YLG
Member

Posts: 3




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« Reply #5 on: March 22, 2008, 10:35:19 AM »

I couldn't agree more. It's very nicely made, tunes as advertised--and is about as useful as a dummy load. I've had the BB7V on a coax switch for a couple of months along with a G7RV Jr. short dipole in my attic. There has NEVER been a time when the dipole didn't outperform the vertical. Here I thought my new QTH has terrible reception, or maybe we'd run out of sunspots. When I bought the dipole, suddenly the bands were hopping. This thing is a beautiful piece of junk.
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N8CPA
Member

Posts: 87




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« Reply #6 on: July 17, 2008, 06:37:46 AM »

I've had mine on a 30ft. tower since October 2006. It's...adequate. It's a great TX antenna, if all you want is flat SWR, but don't expect it to hear very well. If you get one, use it for transmitting only and use a different one for receiving.  
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