soundtrane Posted November 24, 2011 Report Share Posted November 24, 2011 http://rfvenue.com/diversity-fin Anyone had a closer look at these products? -vin Quote Link to comment Share on other sites More sharing options...
MatthewFreedAudio Posted November 24, 2011 Report Share Posted November 24, 2011 I played with one of these antennas a few months back. From what I remember it worked quite well and it offered both an omni pickup and a focused pickup giving you very good coverage. However, it's mounting system leaves a little something to be desired. Quote Link to comment Share on other sites More sharing options...
soundtrane Posted November 24, 2011 Author Report Share Posted November 24, 2011 This company should approach Mr. Waelder to do real-world field tests. -vin Quote Link to comment Share on other sites More sharing options...
LarryF Posted November 24, 2011 Report Share Posted November 24, 2011 Some of the claims are incorrect. It is just a dipole antenna and an LPDA co-located and rotated 90 degrees from each other. It will work just that well and no better. And probably no worse. Best Regards, Larry Fisher Quote Link to comment Share on other sites More sharing options...
soundtrane Posted November 24, 2011 Author Report Share Posted November 24, 2011 Ah.... Larry, many thanks. They also have another product that claims to undo the physical problems of helical antennas. I for one really want to get a pair of the usual helicals, but the cost and the shipping of such bulky stuff deters... I've been thinking maybe i can build it out here locally... -vin Quote Link to comment Share on other sites More sharing options...
LarryF Posted November 24, 2011 Report Share Posted November 24, 2011 Hi Vin, Ask for specs such as gain. Remember that dBi gain is always 3 dB higher than dBd gain when you are comparing. I don't see any real specs at the site and that is bothersome. There's no magic to this stuff. Big helicals work because they are big. Again: size, gain, bandwidth- pick any two. Cheers, Larry F Ah.... Larry, many thanks. They also have another product that claims to undo the physical problems of helical antennas. I for one really want to get a pair of the usual helicals, but the cost and the shipping of such bulky stuff deters... I've been thinking maybe i can build it out here locally... -vin Quote Link to comment Share on other sites More sharing options...
soundtrane Posted November 24, 2011 Author Report Share Posted November 24, 2011 Thanks again Larry, got the magic - the helicals need to be the size to work for the bandwidth we need it to work in... There seemed to be NO specs of any kind except some vague dimensions... -vin Quote Link to comment Share on other sites More sharing options...
soundtrane Posted November 25, 2011 Author Report Share Posted November 25, 2011 Received this email from the company owner Chris Regan : Hi Vin, I saw your thread on JWSound, thanks for your interest and inquiry. I have tried to register to contribute some information to the thread but I can't seem to get a confirmation link from the discussion board system! I'll keep trying, there appear to be some great resources on this board I'd love to access and participate in. We do in fact have specification packages going together on each product, they're just not ready yet. We think specifications are important, but not as important as happy customers who are solving problems using our antenna systems, so we put all our efforts there first by working closely with customers and RF experts. We are a new company and have only been on the market for a few months with this line but have had great success in selling out our first two production runs of these products. Prior to RFvenue our team developed Crowley and Tripp Microphones <http://www.protoolerblog.com/2010/07/02/review-crowley-tripp-microphones/> , which introduced new technology to ribbon microphones and was acquired by Shure in 2009 <http://www.mixonline.com/news/shure_acquires_crowleytripp_0604/> The Diversity Fin is highly effective at reducing cross linear polarization fades, namely when your mic transmitter moves from the vertical to horizontal axis and you get that PFFFT sound from your diversity receiver. Contrary to popular belief, the dipole is bi-directional- not an omni. It is not designed or marketed to be a "silver bullet" that will work flawlessly in any condition, RF just doesn't work that way, it's just another more specialized tool for the RF toolbox that works great when space is a concern and signal dropouts are an issue. This just happens to be the case for a lot of location sound applications. Similar thread to the JWSound comment is going on over at ProSoundweb. http://forums.prosoundweb.com/index.php/topic,134535.0.html For more limited range use and when you can run coax from your combiner/receiver to the area of wireless operation, the RF Spotlight can dramatically reduce the amount of farfield RF sources your system sees, giving you more channels in which to work and reducing issues related to signal interference form neighboring systems. The antenna test at the link below is a good illustration of that concept. The RF Spotlight also comes in a 216 MHz version for IFB transmit applications. Lastly, the CP Beam Antenna is really for long range, high gain requirements, but fundamentally different from other types of circularly polarized antennas due to its lightweight, collapsible design which allows for rapid deployment and stowing. For sound mixers and location pros, we have numerous dealer references who are happily selling our products, have performed rigorous field tests, and can vouch for their performance or provide customer feedback, including Gotham Sound <http://www.gothamsound.com/main.shtml> , Professional Sound Services <http://www.pro-sound.com/> , Location Sound Corp <http://www.locationsound.com/> , and Audio Department <http://audiodept.com/> to name a few. I would recommend contacting anyone of them for more information. You may also enjoy reading wireless expert Henry Cohen's application notes on Diversity Fin and RF Spotlight. Those can be downloaded and shared at the following slideshare links. http://www.slideshare.net/RFvenue/rfvenue-diversity-fin-application-notes http://www.slideshare.net/RFvenue/rfvenue-rf-spotlight-application-notes http://www.slideshare.net/RFvenue/rfvenue-rf-spotlight-antenna-test Quote Link to comment Share on other sites More sharing options...
LarryF Posted November 25, 2011 Report Share Posted November 25, 2011 Hi Vin, No real world antenna is truly omni directional but a quarter wave whip or a dipole antenna is about as close as they come. Typically they are referred to as omni directional. Certainly, with the dipole and/or quarter wave in the vertical plane, you can go 360 degrees around the antenna while on the face of the earth, which is good enough for most users. I completely disagree about the specs and happy customers comment. Measurement of a new product is job number 2 right after the first prototype is made. Then if measurements backup the conception of the product, then try it out on the customer. Measuring antennas is not trivial but either is designing them. I have no idea if the design is good or bad, but the first thing I would look for is specifications rather than advertising copy. Best, Larry Fisher Quote Link to comment Share on other sites More sharing options...
soundtrane Posted November 25, 2011 Author Report Share Posted November 25, 2011 <I completely disagree about the specs and happy customers comment.> Larry, me too. I think Chris Regan is reading this thread. I hope he understands where we come from. Using SNA dipoles and PSC Sharkfins apart from the regular whips, and of course the usual whips on the Lectro Tx, I am yet to hear any PFFT in four years of operation. The product that really interests me is the collapsible helical antenna. But of course, looking at the cost of this one, I am once again tempted to attempt a fabrication of a helical at home... -vin Quote Link to comment Share on other sites More sharing options...
LarryF Posted November 26, 2011 Report Share Posted November 26, 2011 Hi Vin and Chris, A collapsible helical is a very ingenious idea and so is the spotlight concept. I just would prefer to see specs on the "gain" antennas before committing. The spotlight is not as critical since it is deliberately meant to receive signals from a small area. Cheers, Larry F Quote Link to comment Share on other sites More sharing options...
soundtrane Posted January 28, 2012 Author Report Share Posted January 28, 2012 Just got a mail from Chris Regan of the rfvenue company: Hi Vinod, I came across your email in my inbox from a while back just wanted to follow up with you with some specifications for the RFvenue line. I recall a forum discussion requesting specs but I couldn't remember where! http://www.slideshar...-specifications http://www.slideshar...-specifications http://www.slideshar...-specifications Hope all is well and best regards, Chris Regan Quote Link to comment Share on other sites More sharing options...
Boomboom Posted January 28, 2012 Report Share Posted January 28, 2012 The second one (sharkfin-dipole combo) : My guess is that the dipole part covers only a portion of what's in the specs (the bandwidth), while the shark fin covers it all. So when out of that dipole bandwidth, there's no "diversity" per se whatsoever, ain't it ? Quote Link to comment Share on other sites More sharing options...
soundtrane Posted January 28, 2012 Author Report Share Posted January 28, 2012 Chris Regan - chris@RFvenue.com Quote Link to comment Share on other sites More sharing options...
Tyler Faison Posted January 29, 2012 Report Share Posted January 29, 2012 I actually did a write-up on my experience with the Diversity Fin. I'm a satisfied customer, though I've never known the specs of the thing. Just a real world experience. http://texassoundguy.blogspot.com/2012/01/new-player-diversity-fin-from-rf-venue.html Quote Link to comment Share on other sites More sharing options...
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