power http://ripr.org en TheEC: West River Runs High Through 1290 http://ripr.org/post/theec-west-river-runs-high-through-1290 <p>As many of you know, RIPR owns and maintains the 1290AM site on the Providence/North Providence town line. &nbsp;Our NPR satellite downlink is there, and we lease the frequency to our friends at <a href="http://www.lprri.org">Latino Public Radio</a>.</p><p>In the past, the site was largely a pond (Whipple Pond) with Douglas Ave forming part of a dam in the eastern corner. &nbsp; After the torrential rains of 2010, the dam broke and the pond drained. &nbsp;Now the West River flows freely through the site.</p> Mon, 31 Mar 2014 14:41:24 +0000 Aaron Read 31289 at http://ripr.org TheEC: West River Runs High Through 1290 TheEC: 91.5 is Back On the Air http://ripr.org/post/theec-915-back-air <p>As of Tuesday November 12th, WCVY is back on the air in limited fashion.&nbsp;&nbsp; As you know, WCVY <a href="http://ripr.org/post/why-wcvy-was-air-few-days">suffered catastrophic damage to its equipment and facility from a roof leak during a thunderstorm in August</a>.&nbsp;&nbsp; The entire space had to be gutted to the concrete walls, and new electrical wiring and drywall installed.&nbsp; Much of the transmitter gear either took direct water damage (e.g. electricity shorting out) or took indirect water damage (e.g. rust and other corrosion), and eventually a lot of it failed completely.</p><p></p><p>We have put a temporary setup in place with a donated 30 watt transmitter on loan (with the <a href="http://en.wikipedia.org/wiki/Antenna_gain">antenna array's gain</a> factor of 2.1, it's really more like <strong>63 watts</strong> of <a href="http://en.wikipedia.org/wiki/Effective_radiated_power#FM_example">Effective Radiated Power</a>), and a special radio that's tuned to 102.7FM (there's a high-gain FM antenna on the rooftop tower) and puts out the <a href="http://en.wikipedia.org/wiki/File:RDS_vs_DirectBand_FM-spectrum2.svg">composite signal</a> directly into the new transmitter.&nbsp;&nbsp; This effectively makes 91.5 into a "repeater" of 102.7FM.</p><p> Tue, 12 Nov 2013 18:43:01 +0000 Aaron Read 24695 at http://ripr.org TheEC: 91.5 is Back On the Air TheEC: Phantom Power http://ripr.org/post/theec-phantom-power <p><strong>BOO!&nbsp;</strong> This time on the Engineer’s Corner, we’ll talk about PHANTOM POWER.&nbsp;&nbsp; Usually not as ghoulish as one might expect, phantom power has to do with microphones.&nbsp;&nbsp; Specifically, some microphones have active circuitry inside them.&nbsp;&nbsp; That means they need power to operate, but it’s unwieldy to run a separate power cord and audio microphone cable.&nbsp;&nbsp; So a phantom circuit is used to provide DC power on the same three wires (positive/hot, negative/cold, and ground) out to the microphone that the audio from the mic also uses.</p><p>A phantom circuit is one of those nifty things in electronics that looks, to the layman, like it can’t possibly work...but it does anyway.&nbsp;&nbsp; Fri, 12 Jul 2013 17:26:02 +0000 Aaron Read 18326 at http://ripr.org TheEC: Phantom Power