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Lectrosonics D4 System
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<blockquote data-quote="Karl Winkler" data-source="post: 32616" data-attributes="member: 255"><p>Re: Lectrosonics D4 System</p><p></p><p></p><p></p><p>Matt, you are correct that the D4 and M4 (Quadra) systems are not Digital Hybrid Wireless, but a completely different technology altogether. They are wide-band digital modulation, basically transmitting 2 or 4 channels of 24-bit, 48 kHz digital. There is some data compression involved, but with David Thomas in our engineering department behind it, the compression is very very good and yields very low distortion or audio artifacts. David is great at making things sound good - he was also behind the design of Digital Hybrid as well.</p><p></p><p>To Bennett's question about antennas: the FCC Part 15 rules that this device falls under specify the type of antennas and connectors we are allowed to supply with it. On top of that, we can't sell it any other way that how it was tested and certified. That said, it is possible to use other antennas, as long as you have the right adapters (<a href="http://www.rfwel.com/shop/RP-SMA-Male-BNC-Female-Adapter.html" target="_blank">http://www.rfwel.com/shop/RP-SMA-Male-BNC-Female-Adapter.html</a>) to go from RP (reverse polarity) SMA connectors to BNC. PWS makes a helical antenna covering the appropriate frequency range, but looking over their site, it is not clear which one is correct Their data sheets show it topping out at 900 MHz, but we've tested one here that covered 800 M to 1G if I remember correctly. </p><p></p><p>We make the PCA900 (<a href="http://www.lectrosonics.com/393-PCA900/View-details.html?qh=YToxOntpOjA7czo2OiJwY2E5MDAiO30%3D" target="_blank">http://www.lectrosonics.com/393-PCA900/View-details.html?qh=YToxOntpOjA7czo2OiJwY2E5MDAiO30=</a>), which is a mildly directional (think cardioid) antenna also designed for this frequency band - and it's inexpensive. Probably more important that being super-directional would be to have line of sight between transmit and receive antennas. In our tests, this system should go 1200 ft. on a clean frequency, with the supplied antennas, if that gives you any idea. Nevertheless, a helical from PWS would probably extend that range considerably.</p></blockquote><p></p>
[QUOTE="Karl Winkler, post: 32616, member: 255"] Re: Lectrosonics D4 System Matt, you are correct that the D4 and M4 (Quadra) systems are not Digital Hybrid Wireless, but a completely different technology altogether. They are wide-band digital modulation, basically transmitting 2 or 4 channels of 24-bit, 48 kHz digital. There is some data compression involved, but with David Thomas in our engineering department behind it, the compression is very very good and yields very low distortion or audio artifacts. David is great at making things sound good - he was also behind the design of Digital Hybrid as well. To Bennett's question about antennas: the FCC Part 15 rules that this device falls under specify the type of antennas and connectors we are allowed to supply with it. On top of that, we can't sell it any other way that how it was tested and certified. That said, it is possible to use other antennas, as long as you have the right adapters ([url]http://www.rfwel.com/shop/RP-SMA-Male-BNC-Female-Adapter.html[/url]) to go from RP (reverse polarity) SMA connectors to BNC. PWS makes a helical antenna covering the appropriate frequency range, but looking over their site, it is not clear which one is correct Their data sheets show it topping out at 900 MHz, but we've tested one here that covered 800 M to 1G if I remember correctly. We make the PCA900 ([url]http://www.lectrosonics.com/393-PCA900/View-details.html?qh=YToxOntpOjA7czo2OiJwY2E5MDAiO30%3D[/url]), which is a mildly directional (think cardioid) antenna also designed for this frequency band - and it's inexpensive. Probably more important that being super-directional would be to have line of sight between transmit and receive antennas. In our tests, this system should go 1200 ft. on a clean frequency, with the supplied antennas, if that gives you any idea. Nevertheless, a helical from PWS would probably extend that range considerably. [/QUOTE]
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