Tom Visser Posted July 29, 2015 Report Share Posted July 29, 2015 I had several custom dipole antennas made, haven't done formal tests yet, but interested to find out the benefit, if any. Shown are some B25 in use and a B21 next to some Lectro B21 antennas. Quote Link to comment Share on other sites More sharing options...
Philip Perkins Posted July 29, 2015 Report Share Posted July 29, 2015 Do you think just that diff in length will buy you noticably more range or consistency ? I await your results with interest. p Quote Link to comment Share on other sites More sharing options...
Tom Visser Posted July 29, 2015 Author Report Share Posted July 29, 2015 Just an informal run - took a little walk around the neighborhood. TRX-900LA @ 25mW, placed in a corner of my house with lots of appliances, chargers, wires, i.e. a bad RF spot. 2 separate QRX-100 were running, one with 1/4 wave whips and other with dipoles. Walking down the alley across the street from my house, it seemed that the 1/4 wave whips started to show RF blips / red LEDs first, but with diversity tuning, still kept "online" while the dipoles were more consistently showing 2 green markers. I started getting hits on the 1/4 wave whips and then maybe 10% to 20% the distance later, started getting hits on the dipoles. It's certainly not night and day difference in performance, but shows some improvement when mounted directly to the QRX. I suspect, that if placed on a micplexer or other device with amplification, that the dipoles would show even better performance over whips as the signal to noise ratio of the dipoles should be better than the 1/4 wave whips. Will try to do something soon with quantitative measurements. Quote Link to comment Share on other sites More sharing options...
Bertolomi Posted July 29, 2015 Report Share Posted July 29, 2015 Did you build them like in this video??? Quote Link to comment Share on other sites More sharing options...
Tom Visser Posted July 29, 2015 Author Report Share Posted July 29, 2015 I found a guy who was making similar antennas for other radio gear, contacted him, and had him make me some with my desired center frequency tuning. I don't know the exact construction method, but the part where the ground plane shield element would go has a nice semi-rigid tube, so the antenna keeps its shape and gives enough heft and strength without becoming overly bulky. The part between the tube and SMA, a very short section, is flexible and of course the positive antenna element is flexible too. I had 6 antennas done for $65 shipped from the Ukraine, which is where my man "Oleksandr" is from. I don't want to publicly list his email, but message me and I'll PM you it. He was quick and when I told him I wanted special color heat shrink he was agreeable to doing custom work. They didn't have brown shrink for my B21 antennas at his market, but used "stone red" instead. I will definitely use him again for future antenna needs, the quality so far meets my expectations. Quote Link to comment Share on other sites More sharing options...
Tom Visser Posted July 29, 2015 Author Report Share Posted July 29, 2015 (edited) He agreed to have his contact publicly listed - Alezandr from Kharkov Ukraine. http://baliv2.wix.com/fpv-antennas baliv@email.ua Edited May 14, 2016 by Tom Visser changed contact info Quote Link to comment Share on other sites More sharing options...
Tom Visser Posted May 14, 2016 Author Report Share Posted May 14, 2016 Just wanted to update this thread as Alexandr's email changed slightly... baliv@email.ua Just email him what you need and he accepts paypal. shown below are 4 more antennas in B25 (this time all black shrink with little green caps) and also a pair of Zaxnet antennas with a specified center frequency of 2.439 GHz. All this for $66 shipped from Belarus to Hawaii (don't hold me to this as I may have received a courtesy price break). Quote Link to comment Share on other sites More sharing options...
soundtrane Posted May 14, 2016 Report Share Posted May 14, 2016 On 7/29/2015 at 1:41 AM, Tom Visser said: He agreed to have his contact publicly listed - Alezandr from Kharkov Ukraine. http://baliv2.wix.com/fpv-antennas baliv@email.ua there are a bunch of guys from out there - masters at what they do. this guy seems to be one of them. Quote Link to comment Share on other sites More sharing options...
RPSharman Posted May 14, 2016 Report Share Posted May 14, 2016 Nice! Quote Link to comment Share on other sites More sharing options...
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