| Author |
Message |
    
707
| | Posted on Wednesday, October 02, 2002 - 11:47 am: | 
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mobile beam
OK....they must be kidding.... Anybody want to take technical potshots?
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Tech833
| | Posted on Wednesday, October 02, 2002 - 12:16 pm: |
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No need. They did it themselves quite nicely. |
bruce
| | Posted on Wednesday, October 02, 2002 - 2:59 pm: |
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guys i just went up to their site and have only one comment YOU GOT TO BE KIDDING! |
bruce
| | Posted on Wednesday, October 02, 2002 - 3:05 pm: |
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We had a guy in st pete years ago who had a 20 elm 1296 yagy with a rotor on his truck and he worked around the state with it he was a rf engineer who loved to tinker with antennas and would come unglued if he saw this! Im willing to bet most on this forum are too smart to fall for them anyway .....hard to belive that there are people out there who make a liven selling ANTENNA SNAKE OIL! |
Capncrunch
| | Posted on Wednesday, October 02, 2002 - 5:46 pm: |
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i have talked to a few people with these stargun mobile beams and the ones i talked to praised them said they worked excellent i have not tried them though and at the amount of $$$$ one guy said he had invested in his stargun i dont think i ever would 1 guy told me he had $300 and another told me he had almost $600 in his stargun ant. coax and mount thats just a little to much i think,i also bet it didnt work any better than the solarcon on my truck,have any of you seen the predator 10k flat side antenna?i know someone that uses 1 and you can tell a good bit of differance when he switches to it from the vert. when talking to him on cross country skip |
bruce
| | Posted on Wednesday, October 02, 2002 - 7:15 pm: |
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capncrunch
Yagi and uda were 2 sharp guys if that kinda antenna realy worked they would have made it 75 years ago.... Backin 78-80 Dr Lawson did a serious of reports in Ham Radio that are classic no where did he ever even think that shrinking elements to a small percentage of normal size would result in proformance of any kind at all in short ....They need to SHOW ME. |
Honkytonkman593
| | Posted on Wednesday, October 02, 2002 - 7:47 pm: |
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well i have run the stargunn 9-1 and 9-2 with the beam kits and yes they run a minimum of 300 dollars for the antenna set up. i liked them and they worked great even if you dont believe me. but they dont handle driving around very well. at least at highway speeds. i guess i dont see what you dont believe in the stargunn set up? oh well. |
Znut
| | Posted on Wednesday, October 02, 2002 - 8:01 pm: |
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Can I take my 2 meter beam and mount it under and have my very own stargun? I bet it recieves the weather band real well! The total length of all the metal parts on the "beam" part may not even be a 1/8 wave if resonant at all. |
707
| | Posted on Wednesday, October 02, 2002 - 8:39 pm: |
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The Stargun website cites a best case gain of 4.24db. That's if EVERYTHING is PERFECT. That is just a bit over a half S unit, no? I would be interested to see a shootout between a big rig running co-phased Firesticks and one running the "Stargun".
Then again...look at the Isotron antenna. It looks strange, but is supposedly as effective as a half-wave dipole.(Rayfield also makes an 11m version of the Isotron, which is not in the web catalog)
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Taz
| | Posted on Wednesday, October 02, 2002 - 9:43 pm: |
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Tech833,
What type of beam is that? what kind of gain is really expected from it? |
Antennadude
| | Posted on Wednesday, October 02, 2002 - 9:53 pm: |
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707 is right. Take a look at the Isotron. You can mount up to three of them on one mast and hook them up to a switch box and have a great set of "beams"
The Isotron works well indoors also, in an attic etc. |
2600
| | Posted on Thursday, October 03, 2002 - 1:33 am: |
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Right, they re-wrote Maxwell's equations and forgot to tell anybody. Just goes to show that anything will radiate, so long as you can figure out how to FEED it. I didn't see any references to a commercial-quality, calibrated lab antenna range. That kind of measurement I can believe, but I don't anticipate we'll be seeing that from these guys. Kinda reminds me of what Richard Feynman used to call "Cargo Cult Science". During WWII, primitive occupants of remote south-sea islands would be amazed at the sudden construction of a harbor and airstrip. Lots of really cool cargo would arrive constantly by ship and air. When the war ended, the military bugged out, leaving the air strip. The natives would start to miss all that cool cargo, so one of them would take the halves of a coconut and make "earphones" and sit in the radio hut, jabbering into a palm frond. Another one would go out on the airstrip and wave the loadmaster's paddles around, but no planes, no ships would come. They were going through all the right motions, but no result, and no good explanation why.
Like P.T. Barnum said, "Theres one born every minute".
73 |
Capncrunch
| | Posted on Thursday, October 03, 2002 - 7:16 am: |
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whatever works for yourself i guess
i just cant see spending $300-$500 on a mobile antenna i have talked 8o+ miles straight out on a 5ft broadstick fiberglass antenna{with a little help} and that is cheaper than the mount for one of these starguns and i doubt they will do much if any better |
Antennadude
| | Posted on Thursday, October 03, 2002 - 11:50 am: |
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Go to the Isotron site . All the info you need is there!! Maybe we should get 707 to get one and test it!! Or anyone that has the know how to!!
I will even pay for the antenna for the test!! |
Phineas
| | Posted on Thursday, October 03, 2002 - 3:28 pm: |
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4.24 db gain? For 300 dollars? With a coil? ...huh
Aint no way. At best those antennas may change the radiation pattern, but that is not gain.. I will bet those antennas are very broadbanded though. Now, with a 3:1 balun, I could build a REAL beam that would fit on top of a van with the driven element being a 1/4 wave folded dipole with a capacitor. Maybe I should build one for 20 dollars and sell it for 300 dollars? What do you think?
Phineas |
bullet151
| | Posted on Friday, October 04, 2002 - 2:03 am: |
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build it someone will buy it! |
Crossbones_748
| | Posted on Sunday, October 13, 2002 - 2:06 pm: |
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I have tested a couple of the Stargun antennas. I have copied one of their beam antennas just as an experiment. Although it did a good job, it wasn't worth the trouble and expense of building it. I can't honestly compare the performance of the Stargun to mine because the antenna was not an "exact" copy. It is a good idea but in my opinion, a good dual antenna set up is cheaper, easier to tune, and more practicle.
The vertical mobiles performed very well. They weren't very eaisy to tune. After I completely disassembled the antennas and cleaned the corrosion, they did well. I am not giving Stargun a bad report. I am not going to say anything bad about any antenna builder. The Stargun antennas that I tested were fine antennas. It is a different story if you send them an e-mail and need a quick reply.
David |
fdirsh
| | Posted on Sunday, October 13, 2002 - 4:08 pm: |
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JoGunn use to make a mobile beam. Never saw any of them in use. |
lil-bump
| | Posted on Friday, October 18, 2002 - 12:35 pm: |
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I'm a stargun fan, but not for his mobile beams. But the Big Bopper kicks butt!!! |
