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Wireless FM Transmitter

M

MarioMania

I just want to ask the people who know's e-skipping on FM..

I have like a Semi Powerful FM Transmitter that goes up to 1,000 feet on a good Radio

Will it be possible to get a skip out of it?? on like 87.7 FM

Thanks
 
You'd need more than 1000' to get up into the e-layer of the ionosphere.
 
Would Trope be a possibility, K? If I have my physics somewhat in order, Trope comes much lower than 1000 feet. (I guess a tornado would be the ultimate display of trope, hi).

I'd be a bit hesitant to suggest that somebody bicycle around with a portable during a tornado, but foggy nights? Stagnant afternoons? Might they tend to give WMAR-FM a bit of distance?
 
Tropo tends to hurt the weaker signals and help the stronger signals. If there's tropo your part 15 will go maybe 10 feet till a station 100 miles away or more blasts in.

A powerful pirate station on 87.7 in Boston was heard in Georgia this summer on e-skip. I have also DXed that same pirate via tropo in New Jersey.

My 100 watt college FM station was heard in Louisiana this summer during an e-skip. I was on the air during that e-skip opening and identified the station every 2 minutes (even in the middle of a song) and gave out the phone number. And got a call from a DXer in Louisiana.

If you want to shoot skip yourself, try CB or get a ham license.
 
Nick's right. There an LP station located about 7 or 8 miles from where i live. During the evening, they play these cool old time radio shows and I try to listen. However, even the slightest tropo brings in normally out of range signals from south of Chicago AND from the Grand Rapids, MI market. The channel becomes a mess and the little LP station becomes VERY tough to listen to, despite being much closer than the others.

Your wireless FM transmitter probably doesn't have enough radiated power to be bounced through a tropospheric duct. It's not just antenna height that's involved; you need at least a little juice too. Low power and part 15 transmitters are almost always overwhelmed under such conditions.
 
Thanks all for replying

The Wireless FM Transmitter from China..I got 4 of them

for like $5

From my house on my DX-380 on 87.7

2,426 Ft weak..but I hear it
 
Mario, may I ask where you got them. Was it ebay? I might be interested in picking one up too - they sound pretty effective. Better than the offerings in your local electronics store.
 
I got it on eaby..but

The last 3 I got.. it didn't go to far, I got lucky with the first one I got..I want to hack a UHF/VHF Transformer to put in the unit..so I could hook up a external antanna

1 problem..I might lose the reception or I might make it to Powerful making it boom all the way up to a mile
 
Be SUPER careful at what FM transmitters you buy from eBay. Anything made by HLLY is out of the question. They're often much too powerful and can land you in some serious FCCing hot water.

Your best bet is a C. Crane FMT. It gets GREAT coverage on most radios. Doesn't go under 88.3 or above 107.7 MHz and the best you can hope for is 1,000 feet (under DX - EVERYTHING varies.)
 
Cheap Brands From China = Bad.
C Crane = Good.

I use a C Crane and get about 1,117 feet Max. Of Those 1,117 Feet only about 300 of those give you clear reception on any radio. about 500-700 for Home Theaters, the rest is for DX radio's and Car Radios.
But in all that 79 houses is pretty darned cool :)
 
WOW!!! 79 Houses for a wireless FM Transmitter? AMAZING!!! Where I am, I would only get about 5 houses with clear reception, 11 to 21 houses for Home Theaters, and 54 houses for DX and Car Radios.
Incidentally, several years ago my dad was experimenting with one of the Ramsey FM transmitter kits (don't remember which one) and an FM dipole transmitting antenna (don't remember the details on that either but I think it was 1/2 or 1/4 wave and I think I remember it being enclosed in PVC pipe). Upon plotting the DX/Car radio range on a Google Maps image screenshotted and imported into GIMP, I do remember that range was probably about where the signal would be sinking into the noise on a walkman with the headphone antenna fully extended. We went with FM, as we were trying to provide spanish translation for bible studies / church services at the time, and the AM system we tried (one of the Ramsey kits, and a 4 foot or so (i think untuned) loop antenna) was barely getting halfway across the ~70-150-person congregation before it was seriously hampered by static, or, at night, co-channel interference (Dad said the antenna was tuned for the middle of the band, IIRC). I wonder now if we could have gotten better range by setting up a proper AM antenna system? Unfortunately though, setting up a ground radial system was completely out of the question.
If I was going to set up a wireless transmit system now (of course it would NOT be on FM), I'd be hoping for a static-free signal range on a typical walkman / portable comparable to what I've heard the range for some part 15 AMs quoted (for example pegging the RSSI(dBu),SNR(dB) meter at 63,25 at about 1 mile - a 1kW station 8.3 miles from me, reads about 57,25 at night), within about 100 feet or so I'd want it to be strong enough to overload my Tecsun PL-380, and within about 5 feet I would like it to overload a crystal set which has an antenna that is at most a 2-3" loopstick, loop, or wire (whichever of those 3 would be the least sensitive).
 
I have used the C-Crane transmitter also. For me, it sends out a stereo signal for about five-ten houses around my house. In the car, I have tracked the signal for two streets. It is fun to think that anyone would pick it up and listen, but I doubt it, unless you put it on and leave it on for 24-48hrs or more. You need somebody to be tuning their dial manually to come across your signal to stop and spend time to listen to it. But the fantasy is there. I know, I play OLDIES from the 50's-thru the 70's on a regular basis and in my car -- on my daily commute to and from work. I used to hear alot of people doing the FM transmitter thing in Las Vegas about two years ago. You'd be driving down the road and hear music on a blank channel. Then, you would turn or they would and the signal would drop off.
 
Bongwater said:
Be SUPER careful at what FM transmitters you buy from eBay. Anything made by HLLY is out of the question. They're often much too powerful and can land you in some serious FCCing hot water.

Your best bet is a C. Crane FMT. It gets GREAT coverage on most radios. Doesn't go under 88.3 or above 107.7 MHz and the best you can hope for is 1,000 feet (under DX - EVERYTHING varies.)
Click to expand...

The FCC doesn't seem to do that anymore. There are pirates that have been on for years without being visited, let alone busted.

Part 15 is 250 mv/m at 3 meters. It should go a quarter mile at most with a sensitive radio on a clear channel.
 
I have my own Pirate Station in my house only using my Laptop & my Wireless FM Transmitter on 87.7 or 88.1...

The one that's the 88.1 is the weak one, It doesn't go as far at the front
 
OK, I use a wireless FM transmitter, to broadcast whatever I'm streaming on my computer, to our household radios and...beyond.

Here's what I use ~> http://cgi.ebay.ca/FM-TRANSMITTER-2...er_MP3_Player_Accessories&hash=item5add14ba91

Actually, I have 2, which cost me $12 CDN each, delivered to my door. One I run (with supplied 12 volt adopter), with my MP3 player, in the car. The other I have hooked up to my computer, upstairs on the 2nd floor of our home, which gets its power through a ($1, not supplied) USB cable.

I did a little test, while running an errand this morning, to see how far the signal carries. I used both the odometer on my car and the Draftlogic distance calculator (http://www.daftlogic.com/projects-google-maps-distance-calculator.htm), to come up with some figures...not very scientific, I suppose, but interesting none the less. I was streaming London's Classic FM and had the transmitter set at 87.9.

Clear signal between 500 metres (odometer) and 615 metres (Draftlogic), absolute limit for audible signal, between 1800 metres (odometer) and 2100 metres (Draftlogic).

Is it the best thing out there? Perhaps not, but for $12, I'm certainly not complaining!

~BG
 
That should be about the limit for legal part 15. You could get an illegal pirate transmitter for a dime a dozen on eBay. If you got as little as $300 you can have a station that covers 10 miles.
 
On my walkman it dosen't go more then 400 feet..But that's at the house where I live..

That's with hills

But at my brothers house it goes father


In my brothers Radio in his truck from my brother house on my black one

It went up to 2,000 feet

Not even my DX-380 picked it up, I don't know if FM Radios in Cars has better Antannas
 
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