Echo is caused by reflected sound, Solid walls & ceiling cause reflections, creating distortion. This is not as much a problem outside. Two items that affect audio outside are first, abundant noise, the higher the abundant noise you have the higher the PA audio needs to be. When you need to run high audio levels, the people up close it is too loud, where as the people farther away have a harder time separating the abundant noise from the PA audio. The place you set up the sound system needs to be a quiet location with low abundant noise, not next to a freeway, busy road or equipment. Second, try to locate the speakers as high as possible & as close as possible ( on a 1 story roof if possible ) If you spread the speakers out (unless they are widely separated) people located between the speakers, maybe closer to 1 than the other will receive a audio delay in one ear than the other, making understanding hard. ( sound travels slow LOL) also the PA system must have some EQ adjustment in the speakers mic as voice has a narrow dynamic range, too much dynamic range on a voice mic will amplify white noise & background audio making the voice sound distorted. If you locate the speakers high and away from the listener, the 2 or more speakers will sound more like 1. Robert
From: BVARC <[email protected]> On Behalf Of David Hold via BVARC Sent: Thursday, April 09, 2020 12:35 PM To: BRAZOS VALLEY AMATEUR RADIO CLUB <[email protected]> Cc: David Hold <[email protected]> Subject: Re: [BVARC] Fm transmitter for Easter service Good luck Hate PA. All echo and distorted and unintelligible On Thu, Apr 9, 2020 at 11:02 AM Martin Blaise via BVARC <[email protected] <mailto:[email protected]> > wrote: We are just going to have the pastor stand in the grass outside the church with an amplifier. If it is unsafe to roll down windows please let me know and I will contact the church and tell them not to do it. Thanks I had encouraged leaving parking spaces open between cars. If I am going too far on this let me know. Thanks. We won't have many cars there. On Thu, Apr 9, 2020 at 10:48 AM Gus Bernard via BVARC <[email protected] <mailto:[email protected]> > wrote: Great article, Jimmy - thanks! Gus, KG5OFB On Wed, Apr 8, 2020 at 6:14 PM Jimmy Vance via BVARC <[email protected] <mailto:[email protected]> > wrote: This is a good article that discusses the subject at hand https://thepublicsradio.org/episode/theec-radio-for-churches-during-coronavirus --jv NA5D On 4/8/2020 12:13 PM, SETX Telecom via BVARC wrote: The LEGAL limit for unlicensed operation in the FM as well as other bands is in Part 15....It is NOT based on power but a field intensity..In the FM band of 88-108, it comes CLOSE to 100mw ERP (Effective Radiated Power) but not exact. Bluetooth is usually limited to 30ft. 100mw on FM MAY get you legally 300 ft....A CB radio would cover that better but then how many of the attendees would have CBs oin their cars? Multiple FM Part15 xmtrs placed in the right spots would work IF You can find enough clear frequencies. Then you have to get the audio to them Christopher W. Boone WB5ITT Trustee, W5APX Chief Engineer, iHeartMedia New Orleans On Wed, Apr 8, 2020 at 12:01 PM john Parmalee via BVARC <[email protected] <mailto:[email protected]> > wrote: I have watched this thread and thought about it and an idea struck me. Why not use a service monitor. An IFR or equivalent will cover the FM band, I don't know it it will modulate to 75 kHz without distorting so you have to turn the receiver up a bit. I don't know what size of parking but I suggest an antenna cut to frequency up 15 or 20 feet or you might try a mobile mag mount stuck to a pipe vertical. it will be short but has a coil in the base that will extend it. Make sure it has something metal to mount to to. I defiantly think you need a run through with enough time for a redo. As far as the FCC is concerned you are a pirate station and illegal. As far as I know under part 15 you can run a low power AM transmitter but no provisions for the FM band. It is quite common though for translated audio in services and such with no enforcement action if there is no interference to anyone. Choose your frequency by listening carefully, I expect a full parking lot will be different RF wise from an empty, Get that antenna in the air, you will need the margin. Call me if I can help, let me know how it went. Good luck and may god bless your service.. John Parmalee [email protected] <mailto:[email protected]> 281-380-3811 K5VGM WI2XLJ In a message dated 3/31/2020 4:45:33 PM Central Standard Time, [email protected] <mailto:[email protected]> writes: Found this on Google; haven't verified with the legal code. https://learnchristmaslighting.com/what-fm-transmitter-do-i-need-for-my-christmas-light-show/ <https://learnchristmaslighting.com/what-fm-transmitter-do-i-need-for-my-christmas-light-show/> What FM Transmitter Do I Need for My Christmas Light Show? – Learn Christmas Lighting Okay, maybe they aren’t “turning the dial” quite like the old days, but if you want your display to be heard, you need an FM transmitter.. Even though setting up some large PA speakers might seem like a good idea, you’ll quickly lose the friendship of your neighbors! learnchristmaslighting.com <http://learnchristmaslighting.com> _____ From: BVARC <[email protected] <mailto:[email protected]> > on behalf of Ravi Patrick Ratnala via BVARC <[email protected] <mailto:[email protected]> > Sent: Tuesday, March 31, 2020 4:40 PM To: BRAZOS VALLEY AMATEUR RADIO CLUB <[email protected] <mailto:[email protected]> > Cc: Ravi Patrick Ratnala <[email protected] <mailto:[email protected]> > Subject: Re: [BVARC] Fm transmitter for Easter service Marty, I've read the same thing - somewhere - but I can't find anything permitting it in the regs, so I don't know if it's true. If it is, I imagine it would be for things like bluetooth devices that are designed to pump spotify from your phone through your car's radio. If so, I'd suspect that "100 feet" is a dreamy maximum, and that it would sound terrible in the real-life scenario you describe. But as always, FleaBay to the rescue: a 6-watt FM transmitter! For just a hundred bucks, you can start your very own pirate radio station anywhere on the commercial FM dial. This thing should provide nice, punchy audio to your entire church's congregation. Very, very illegal, though. https://www.ebay.com/itm/Retekess-6W-FM-Transmitter-Stereo-Station-Antenna-Wireless-Factory-Church-Home/324108794811?hash=item4b7663bbbb:g:48UAAOSwBfhcExIJ How about just setting up a PA system? 73 de N5OL On 3/31/2020 3:01 PM, Martin Blaise via BVARC wrote: I read that anything 25 milliwatts or less for 100 feet is ok On Tue, Mar 31, 2020 at 3:00 PM Alexander Park via BVARC <[email protected] <mailto:[email protected]> > wrote: I'm not sure that will be legal without an license On Tue, Mar 31, 2020, 2:09 PM Martin Blaise via BVARC <[email protected] <mailto:[email protected]> > wrote: My church would like to do a parking lot service for Easter and my pastor asked me what fm transmitter we could use to broadcast the service from the church to the cars per social distancing. Email or call me at 713-305-2148 thanks Marty ________________________________________________ Brazos Valley Amateur Radio Club BVARC mailing list [email protected] <mailto:[email protected]> http://mail.bvarc.org/mailman/listinfo/bvarc_bvarc.org ________________________________________________ Brazos Valley Amateur Radio Club BVARC mailing list [email protected] <mailto:[email protected]> http://mail.bvarc.org/mailman/listinfo/bvarc_bvarc.org ________________________________________________ Brazos Valley Amateur Radio Club BVARC mailing list [email protected] <mailto:[email protected]> http://mail.bvarc.org/mailman/listinfo/bvarc_bvarc.org <https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=emailclient&utm_term=icon> Virus-free. <https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=emailclient&utm_term=link> www.avast.com ________________________________________________ Brazos Valley Amateur Radio Club BVARC mailing list [email protected] <mailto:[email protected]> http://mail.bvarc.org/mailman/listinfo/bvarc_bvarc.org ________________________________________________ Brazos Valley Amateur Radio Club BVARC mailing list [email protected] <mailto:[email protected]> http://mail.bvarc.org/mailman/listinfo/bvarc_bvarc.org ________________________________________________ Brazos Valley Amateur Radio Club BVARC mailing list [email protected] <mailto:[email protected]> http://mail.bvarc.org/mailman/listinfo/bvarc_bvarc.org ________________________________________________ Brazos Valley Amateur Radio Club BVARC mailing list [email protected] <mailto:[email protected]> http://mail.bvarc.org/mailman/listinfo/bvarc_bvarc.org ________________________________________________ Brazos Valley Amateur Radio Club BVARC mailing list [email protected] <mailto:[email protected]> http://mail.bvarc.org/mailman/listinfo/bvarc_bvarc.org ________________________________________________ Brazos Valley Amateur Radio Club BVARC mailing list [email protected] <mailto:[email protected]> http://mail.bvarc.org/mailman/listinfo/bvarc_bvarc.org -- David Hold [email protected] <mailto:[email protected]>
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