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87.7 FM with 50 mW
 
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87.7 FM with 50 mW

 
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Last Post by Anonymous 11 years ago
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 Carl Blare
(@carl-blare)
Posts: 2621
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Part 74 of the FCC Rules have provision for 50 mW FM transmitters such as this Comtek unit:

http://comtek.com/bst-25/

Such transmitters are authorized for broadcast production locations, film/video on-location, and live entertainment applications. Of the 119 possible frequencies spanning TV channels 5 & 6 this can be set for 87.7 MHz for use with FM receivers.

Atrain radio might qualify because he has a TV version of his radio show on Sstream, Bob Felmly no doubt qualifies because he does regular live broadcast productions for LPFM station WCFI, KDX would qualify because we have KDX-TV and the video production facility which was my profession from 1990 to 2000, and by generating feeds to a TV webcam everything would be set.

Contact Comtek and discuss your plans, they will guide you along.

If there is a TV station using a channel you can't use it.


 
Posted : 08/08/2015 3:13 pm
 Anonymous
(@Anonymous)
Posts: 0
 

There is a spur from a Godcaster here called The Journey.  If I could broadcast with 50 mW what if I were to do what Music Choice does and have descriptions of each song I play as the analog video?  This way I could be on that channel?  Or wait... If I had an AM transmitter upstairs on the 2nd floor I wonder if I could legally have this unit and that way I would be able to use FM.  If only that spur was not there.


 
Posted : 08/08/2015 3:42 pm
 Anonymous
(@Anonymous)
Posts: 0
 

A spur from a godcaster on 87.7 is fair game for complaint.


 
Posted : 08/08/2015 3:52 pm
 Anonymous
(@Anonymous)
Posts: 0
 

It is only suppose to transmit on 88.3 but I also hear it on 87.7.  Makes me mad but I don't know if there is a way I can transmit down there legally.  I'll have to look into this.  Oh I had to sign off 96.3 after 8PM as the temperature inversion is happening all over again.


 
Posted : 08/08/2015 4:39 pm
 Anonymous
(@Anonymous)
Posts: 0
 

Are you nearby their 50kW transmitter?


 
Posted : 08/08/2015 5:05 pm
 Anonymous
(@Anonymous)
Posts: 0
 

Hi Guys: Thats nice to know i'll have to get a good radio receiver for the feeds i been looking at the tecsun PL 880 unit to get it seems to be a good radio.

It goes pretty low on fm frequency. 

whats you opion on it ?

station8

 


 
Posted : 08/08/2015 5:52 pm
 Anonymous
(@Anonymous)
Posts: 0
 

I'm around 5 miles from it.  It is very close to Walmart.  Sometimes I get the spur worse than others.  Now Today its not as bad.  I wonder since its legal if I were to use my present transmitter and go down to 87.7 Mhz would I be taking a risk?  I'd like to find a frequency where I could transmit day and night.  Its why I thought about the Talking House AM Transmitter.  If my roomate moves out of the room upstairs I could use that room mainly for the AM transmitter.  I'd just need a feed to it.  Now if 87.7 were legal for a currect FM transmitter to go down there I'd be set.  I could program my SainSonic to go down there by switching to the Japanese FM protocol, but don't need to get busted simply for transmitting on 87.7 which by the way is blank 24/7 here and I would not have to worry about the temperature inversions.  I know I'd get more listeners down there too as its easy to find.


 
Posted : 08/08/2015 6:47 pm
 Anonymous
(@Anonymous)
Posts: 0
 

Frequencies below 88.1 are not allowed for Part 15 use.

But, acording to the information learned from the Comtek Transmitter, those lower FM channels are available for Part 74 use.

It is also frustrating to read the actual FCC Part 74 Rules for remote transmitters which say things not mentioned in the Comtek literature: Part 74 transmitters may not be used for direct broadcast to the public.

Well that's odd, because my FM transmissions under Part 15 are not intended for a public audience, so maybe I'm ready for Part 74?


 
Posted : 09/08/2015 5:14 am
 Anonymous
(@Anonymous)
Posts: 0
 

This could be how Belkin and Scoche are skirting around the part 15 rules here and are allowed to sell their transmitters that go down to 87.7 Mhz. It has such a short range that your lucky to make it 6 inches from the antenna of a car Radio to be heard in Stereo. The Belkin is a real piece of garbage. But if you could get out and you said “Your Rocking with The Legacy give us a call on the Rockline” then you'd be considered a station and you'd get busted for transmitting on 87.7 Mhz. Well to me it doesn't matter what you do if your signal reaches 800 feet it don't matter if you play music or yell ga ga goo goo and bang on frying pans all day into the mic and send it over the air the signal will cause the same amount of interference period. Now to my second thought as to why the FCC may not want you to broadcast on 87.7 or 87.9 Mhz. Though Channel 6 over the air TV may not be there you still have Cable TV which still uses analog 2-6 and thus would be prone to your transmitter causing interference which in turn would cause you to get a NOUO very fast. See the color burst signal is a bit past the audio of 87.7 Mhz. I can't remember exactly where but for that matter it could be 87.9 which is what I suspect. I had to be careful when I had my transmitter in Michigan not to transmit too close to channel 6 as when I transmitted on 88.1 I saw rainbow colors on my TV and the neighbors down the street. It was not long that I moved it to 88.3 Mhz and I still had to be careful with that as well. My memory now is coming back to me from years ago when I chose my blank frequency. 88.3 Mhz also was too close to my Rock station in Canada that I could receive when conditions were just right. Album Rockers would also listen to that frequency so I had to be sure Friday nights and Weekends the station was not receivable or my friends did call and ask me to stop transmitting till the other station could not be received for I was scratching them. I couldn't transmit on 88.1 or I'd interfere with Channel 6 and Mom and Dad would scream at me “What are you doing?” So now I remember why will never get those frequencies ever forget the idea. Sounded good till my memory came back and reminded me how stupid I was the first time I did it in Michigan. I was just lucky I had good friends looking out for me. I learned from my mistake thank God I didn't do it ever again. And for those who got complaints for being on 87.9 Mhz I bet that was why possibly I don't know but just possibly why people wanted to taqke your station down. Maybe they just didn't want to be nice and say “Move off the frequency your killing my channel 6 on cable!”


 
Posted : 09/08/2015 1:12 pm
 Anonymous
(@Anonymous)
Posts: 0
 

Ga Ga Goo Goo CLANG CLANG CLANG CLANG!


 
Posted : 09/08/2015 1:30 pm
 Anonymous
(@Anonymous)
Posts: 0
 

That the Schoche will do easily 900 feet with no mods, just the audio cable and whatever path that cord takes to make a resonating antenna. Albeit a mismatched antenna that tiny $9 transmitter makes a very listenable signal.

And yes, i have tried it at 87.7 and still 900 feet give or take.
Whether that is legal or not was not my concern at the time, i just wanted to see the thing perform down there below 88.1 mhz. I am still impressed with such a little device.

Legal or not.


 
Posted : 09/08/2015 3:23 pm
 Anonymous
(@Anonymous)
Posts: 0
 

What modle Scoche are we talking about?  Did you use an extended audio cable?  Interesting.  About the same distance the SainSonic does on High power.  I'd love to see that as a back up transmitter. 


 
Posted : 09/08/2015 4:20 pm
 Anonymous
(@Anonymous)
Posts: 0
 

I'd like to hear a station like The Lagasy mentioned, with clanging fry pans and other weird noises, that's really punk! I've really heard a few stations like that in the past, don't know if they were school, pirates or what, down at the bottom of FM.

I haven't heard any lately, but have run new age nature sound files, and have one that's nothing but a frog croaking for 30 minutes, and have plated that, wondering what someone must be thinking, if anyone was listening in. You announced yours Carl, I just played it in the list, just so someone would say, what is this station, who the hello are these people?

The frog seemed to go on forever, and I thought of skipping out of it, but you know, maybe it was good for thinking and to prove a point, about how you may not always get your favorite music every tim, an appreciation of what you do hear from the contrast of a frog croaking for a half hour before the music or talk starts again.

Maybe I have more frog listeners now.


 
Posted : 09/08/2015 6:47 pm
 Anonymous
(@Anonymous)
Posts: 0
 

There was a youtube video where they tested a transmitter and used an app that made the croaking frog over and over to show how far the transmitter went but didn't want youtube to mute the video because of copyright.  I'm sure if anyone was listening they wondered why a station would play a frog.  Actually there was a licensed station that played jungle sounds while they were changing from WLNZ (The Lazer to WAPE.  Their new slogan was Ape 92.1.  Now this went on for a day or two.  Every once in a while they would say their call sign and went right back to the jungle sounds.  I guess they were recording the tests or something I don't know.  But it is a good way to test your transmitter and put the range results on Youtube without getting blocked.  However to test the Stereo you'd have to have a frog in one channel and maybe ape sounds in the other.  Just a thought.


 
Posted : 09/08/2015 7:55 pm
 Anonymous
(@Anonymous)
Posts: 0
 

Though I am not the moderator, these conversations are drifting into Pirate radio.


 
Posted : 10/08/2015 3:25 am
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