LCARA HAM Radio: Part 2 - COMPACtenna Distance and Obstruction Testing!!!!
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- Опубліковано 29 лип 2021
- Welcome to the Lake Cumberland Amateur Radio Association Club's UA-cam Channel.
KY4BDP takes the COMPACtenna for a spin with some simple real world tests to see how it compares with the Comet and a stubby no-name antenna.
compactenna.com/
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#LCARA #hamradio - Наука та технологія
It needs a cork stopper in the top to make filling with snake oil easier.
^^ this
Brian, nice testing and thanks for the video. Though I think the antenna you are saying is a 1/8 wave is at least a 1/4 wave. It’s hard to tell in the video but it looks at least ~19” tall, if not more. Especially if the coiled part of the whip was straight. But maybe video footage does not impart proper visual perspective.
My buddy just ordered one pf these antennas for GMRS. Cant wait to see his results as well.
Cool!
I just came across your Part 2 testing here, Brian.
This is a very nicely done evaluation and video.
The far distance test (30 miles) was exacting enough to demonstrate the differential, albeit not large, in LOS (Line-Of-Sight) gain between the three antennas.
You then tested in the obstructed environment which is what amateur radio and LMR (Land Mobile Radio - Commercial & Government) communications experience most of the time. In your NLOS (Non-Line-Of-Sight) test among buildings you showed the slight improvement that the short metal whip had over the very tall antenna. Even though the very tall antenna has vertical spatial diversity capture in the multi-path environment, the broader and higher elevation coordinate pattern of the short whip allows utilization of reflected and diffracted signals over buildings.
And in that obstructed location, the tiny COMPACtenna Science & Technology almost equaled the larger antennas due to its strong and diverse magnetic and electric near field components, and elliptically polarized EM far field propagation.
When one is in even more highly obstructed spots/areas such as in valleys or among buildings where the standard technology antennas have very little & noisy to no signal at various locations while strong in others, the COMPACtenna technology benefits can be even further seen, where there is in fact comparatively usable/readable signal in the otherwise 'null' spots/areas. This translates to reduced flutter (analog) and better throughput (digital-data), and even increased 'reliable range' in many obstructed environments.
Thank you, Brian and LCARA.
Dr. Jack, N8NDL
Dr. Jack Nilsson, Inventor - Antennas, EM & Energy
Mine will be here on the 6th of October 2021, yes in two days. In Florida there is no LOS. Maybe I'll make a video.
The quarter wave probably has a higher take off angle than the comet does
Great video
Thanks!
I think what you were calling an 1/8 wave antenna is actually a quarter wave.
Unfortunately I can’t get behind this antenna like you guys are. I purchased the Tri band Compactenna about a year ago and have bought more mounts than the price of the antenna trying to get it to have good SWR. On my vehicle it gets lousy SWR unless I’m using the $15 Amazon mount with it sticking out sideways at a 90 degree angle from my vehicle. Nobody in their right mind would drive around with an antenna like that. Dr Jack was all ears on some previous You Tube comments until I asked for my money back and then you could hear crickets chirping. I will say that the antenna does greatly reduce nulls in the received signals so it has that going for it. SWR above 2:1 is unacceptable in my opinion. Every other antenna that I’ve tried on my vehicle has had very good SWR except for the Compactenna. I don’t really feel like you should have to buy a vehicle to get a good match with an antenna, you should buy an antenna to get a good match with a vehicle. Why every other antenna works fine on my vehicle from an SWR standpoint and not the Compactenna is beyond me. If you buy one of these antennas I highly suggest that you test it quickly and be sure that you can return it to the vendor that your bought if from because Dr Jack isn’t going to stand behind it. Let him stick his reps by having them deal with the return so you don’t get Stu k with it. It’s a great concept folks but not for every vehicle. Test it quick and return it if you are not co completely satisfied. By the way that $15 Amazon mount that they are using has such a high center conductor that it flattens out the center conductor of the antenna unlike any mount that I’ve ever seen. No mount should be that far out of tolerance. I’m not bitter about this just want to add some additional facts so that you have the full picture. Buyer beware as they say. Thanks for putting the video together and providing another opinion.
What vehicle did you try it on?
Hey Biran, I realize this video is a year old so sorry for the late comment. I recently got the same Compactenna and I am wondering where you got the mag mount for it. I have mine on a mag mount but the base is 3" and I am looking for something more streamline. Thanks in advance! KD2TTX
Dr. Jack recommends a mag base on his website, but it was the cheapest on Amazon at the time. Thanks for watching!
The Comet is a much better value and a better antenna any way you look at it.
That’s right