Engineer's Corner

Engineer's Corner
9:23 am
Wed August 14, 2013

TheEC: Air Conditioning at 102.7FM

The indoor half of the new split-unit A/C.
Credit Aaron Read

Air conditioning.  Cool heaven for those who have it, blazing hell for those who don't.  It didn't used to be terribly common in broadcast engineering, but it's become moreso in the last ten years.  The reason is that, more and more, audio processors, RDS encoders, audio encoders/decoders, studio/transmitter links, remote control systems, and even the transmitters themselves, have all become increasingly "computer-like" with IC's, hard disk drives, power supplies, electrolytic capacitors and the like.   All things that fail quickly when operated in temperatures above 80 or so, and the warmer it gets, the faster they fail!

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Engineer's Corner
7:56 pm
Wed July 24, 2013

TheEC: "Normal Accidents"

Jack Lemmon in The China Syndrome

Most people have heard of the "Three Mile Island" nuclear power plant accident of 1979.  But it's famous among engineers for being a "normal accident", in that there wasn't any one thing that nearly caused a meltdown of catastrophic proportions...it was a series of little things inside a highly complex system that all happened as part of "normal" operations.   None of which, by themselves, was terribly problematic.  But they all happened at once, and that was a problem.

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Engineer's Corner
1:26 pm
Fri July 12, 2013

TheEC: Phantom Power

A typical phantom power circuit.

BOO!  This time on the Engineer’s Corner, we’ll talk about PHANTOM POWER.   Usually not as ghoulish as one might expect, phantom power has to do with microphones.   Specifically, some microphones have active circuitry inside them.   That means they need power to operate, but it’s unwieldy to run a separate power cord and audio microphone cable.   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.

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.  

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Engineer's Corner
10:55 am
Tue June 11, 2013

TheEC: Time Delay

A radio tuned to WRNI 102.7's HD digital signal.
Credit Aaron Read

This time on the ENGINEER’S CORNER we go back in time – none of Doc Brown’s famous DeLoreans needed!  Actually, it’s about TIME DELAY, specifically, the time delay on 102.7FM in Narragansett.

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Engineer's Corner
8:50 am
Tue February 12, 2013

TheEC: Zombies and EAS

“This is not a test, the dead are rising from the grave.”

Not quite what was spoken, nor quite a real alert, this weekend nonetheless saw KRTV-TV in Great Falls issue a LAE (Local Area Emergency) alert for several counties in Montana, and spread as far as WLW in Chicago.   The LAE was, yes, a zombie alert, with an audio component that said: “the bodies of the dead are rising from their graves and attacking the living. Do not attempt to apprehend or approach these bodies as they are considered extremely dangerous.”

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Engineer's Corner
10:00 am
Tue February 5, 2013

TheEC: Satellite Dishes and Snow

Credit Aaron Read

  Oh the weather outside is frightful…

Actually, this winter we haven’t seen too much snow.  Nevertheless, snow is something of a chore for us at RIPR, because it builds up on our SATELLITE DISH, which blocks the satellite signal.  Specifically, our NPR and BBC signal, and that means when it snows = dead air on RIPR!

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Engineer's Corner
2:34 pm
Tue January 1, 2013

TheEC: Lightbulbs!

One of the incandescent track lights at RIPR.
Credit Aaron Read

It’s a Star in the East!   It’s shiny Christmas lights!  It’s a slightly-silly, holiday-themed ENGINEERS CORNER on LIGHTBULBS!

Here at RIPR, our offices and studios in 1 Union Station were designed in 1999, and designed to look like our original owner’s studios, WBUR.   Their studios were designed and built in the salad days of the dot-com era: 1995.   So to say that incandescent track lighting is a big part of our lighting scheme, is an understatement.

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Engineers Corner
10:47 am
Tue November 20, 2012

TheEC: Emergency Generator Power

Kohler generator. Simple, unassuming looks - but it can be a lifesaver!

Providence, RI – This week on the Engineer's Corner we talk about power. Not so much "fight the" as "emergency backup"! In fact, this week we're installing a new power generator for our 88.1FM (WELH) transmitter facility. You might've noticed we had issues with a lack of reliable power for almost three days during Hurricane Sandy; we had a generator but it just didn't have the features and capacity we needed.

So in advance of winter storms, falling trees, rime ice and downed power lines, we're putting in a Kohler RES14a propane generator with three 100lb tanks. Yes, the same company that makes excellent faucets for your kitchen, also makes excellent generators, believe it or not.

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Engineers Corner
10:42 am
Tue November 6, 2012

TheEC: Multi-band Audio Processing

An Omnia 6 FM processor, also used on WRNI 102.7FM

Providence, RI – Audio purists refer to it as the scourge of music, but AUDIO PROCESSING is a critical part of any radio station's transmitter. An audio processor typically accomplishes several goals:

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