multiple transmitter

If you do a search of the Part 15 site, using "multiple transmitter", you will find many discussions about this particular issue/problem. There are a lot of considerations, and I don't think that you will get someone to show you all of them on either a video or a paper drawing.

Yes, and check with the Hamilton Rangemaster which is designed to inter-lock multiple transmitters.

Here is a link to their page on the subject.

http://www.am1000rangemaster.com/zerobeat.html

thanks....

...thanks carl!

i paid about $195 for a 0-5 watts us fm transmitter with a 1/4 wave antenna. after hooking up my laptop, dj mixer/mic i range 3-5 miles of coverage with the antenna being 30feet. then i connected a bnc to f type adapter to an ex radio station's 1/4 antenna (70feet) and my range was 8 - 10 miles. to bad i can't stay on the air!!!!

really: should this be as if i am using a multiple (3) transmitter set up broadcasting from my main (master) transmitter.

(1) part 15 us transmitter/antenna sold in a set (30ft pole) covering a 3-6 mile city. verses a (3) part 15 us transmitters covering a 8-10 mile city. FCC NEED TO UPDATE, GRANT PART 15 US TRANSMITTER COVERAGE 1-6 MILES!!!!!!!!!!!!

Your FM transmitter is quite illegal and way over permitted range

EDIT

You can get any range you want assuming you can link your transmitters properly btw.
Also those antennas are not tuned, although I suppose that doesn't matter because you can't tune a part 15 AM antenna either (not physically anyway) You'd have to use a loading coil.

The idea of placing multiple transmitters is fascinating. I actually have no problem finding locations for permission and with power. My dilemma right now is flutter, sync, etc...

Finding the "perfect" spot to put the additional trasmitter (s) is the easy part. But the perfect spot may not lend it self to power and permission. So then I have to move it a few hundred feet or even up to half a mile either way to get power and permission. Too far one way causes a gap between radius' therefore no coverage in the gap and too far the other way causes too much overlap and causes flutter and other sound issues.

Then there's the issue of the endstreamer and exstreamer - pricey, but I hear they work good.

Any more help in this area from those that have successfully linked transmitters would greatly be appreciated.

....it is a part 15 FCC US Transmitter...the antenna @ 3db may have something to do with the transmission...anyway i request for the original rubber antenna that goes..

From post #6 it sounds as if this might describe a system operating in the FM broadcast band. If so, and compliance with Part 15.239 is desired, then the signal radiated by such an unlicensed system is limited to a field strength of 250 µV/m at a distance of 3 meters from the transmit antenna (see FCC §15.239). The useful service radius for such as signal to an indoor, consumer-level FM receiver is only a few hundred feet.

As a "heads up," the FCC is fairly active at issuing citations to unlicensed operators of FM systems having coverage ranges of several miles.

...thanks guys! but i don't think y'all read my post clearly, i was amazed at how far it picked up but also stated (to bad i can't stay on the air!!!!) Note: I am operating under FCC Reg under 1 mile coverage range. Thanks for the heads up.

My goal is..to set up (5) transmitters in different locations (family members), all on the same frequency but all playing gospel music in five different styles...1. Contemporary Gospel 2. Christian Rap 3. Gospel Quartet 4.Country/Pop Gospel 5. Mixed of all 4. my research has shown me that each section would like to enjoy gospel their favorite gospel music in their area.

Each of my PC has a radio program software (SAM Broadcaster) I also have prerecorded radio drops and commercials on them. my research with FCC shows they do allow up to 5 transmitters. THIS IS GOING TO BE COOL!!!!!!! Let me hear from someone....

"FCC reg under 1 mile coverage range"

Never heard of it. Can you please elucidate? Because as far as I am aware, you can operate unlicensed in the U.S. (and Canada) only with the Part 15 regulations (in Canada - RSS210 and/or BETS), and to my knowledge there are no range limitations in any of them (on either AM or FM). And if you don't meet the rules of Part 15 (or RSS210/Bets), then you require a license.

If you are operating under Part 15 fules on the FM broadcast band, the 200 foot range limit is only a rule of thumb used by the FCC; actual range depends on a number of factors, including the receiving equipment (including the sensitivity and selectivity of the receiver, the antenna, etc.), the obstructions between the transmitting antenna and the receiving antenna, whether you're transmitting in stereo or mono, and even the weather.

Given the poor sensitivity and selectivity of most consumer level radios, 200 feet range is actually quite generous - most will be under 100 feet. But with a sensitive and selective car radio, coupled with a decent antenna, and line of sight to the transmitter, you should be able to receive a legal Part 15 signal 600 to 800 feet (maybe a city block). In Canada, where the allowed field strength on FM is 4 times that of the U.S., under such conditions I was able to receive a signal at about 1km out, with some quieting - that translates to about 3200 feet or so (and that was using a transmitter calibrated by the factory for Canadian regulations - a Decade MS-100 with a mono signal).

But it's the field strength, not the range, that is restricted in the rules.

For Part 15 broadcasting in the AM band, it either goes by field strength (but the limits there are so low to make it unusable) or power input to the final stage of the transmitter - 100 milliwatts, coupled with the 3 meter maximum to the combination of antenna feedline + length + ground wire.