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ebrown1972

Transmitter

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I re-read some of the comments. If you are having problems with low level hum on your output, try putting a choke on your power cord similar to this:

 

http://www.radioshack.com/snap-choke-core/2730069.html

 

I was hearing some low level hum and noticed when i put the transmitter on a cheap mechanical timer (so i wasn't broadcasting "dead air" all night) the hum went away. I'm sure someone on here can explain exactly why that happened and it was a nice surprise.

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I have also beat this drum for years. But ignorant people got mad at me. So I figure that not to far in the future there will be some shows shut down and selling their lights and controllers to pay for those fines. Thats fine with me and others cause we will be making a killing on cheap controllers and lights. SO go on a boast about being able to hear your show for miles. We will see who will be crying in the future about how there externial antennas and 7 watt transmitters got them in trouble. And I love the guy who is broadcasting 5 miles away with only 5mw of power. Do you people read and learn anything or just put this plug into this socket and turn it on?

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I was hearing some low level hum and noticed when i put the transmitter on a cheap mechanical timer (so i wasn't broadcasting "dead air" all night) the hum went away. I'm sure someone on here can explain exactly why that happened and it was a nice surprise.

 

You are some how getting some electromagnetic interference through your power cord which causes the hum and the timer some how clears it up a bit. You should have a barrel looking object built into your power cord, it is a ferrite ball which cleans up the signal for sensitive equipment which need clean power you will see them on cameras, monitors and other things that may flicker (or produce a hum) with a dirty power source.

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I've done this for four years now, but I'm still very much a noob. How can you regulate the signal output to avoid any legal threat?

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You have to add an attenuator to the base of the antenna. The attenuator will reduce the power coming out of the antenna.

 

A 10db attenuator will reduce the output by a factor of 10. So if the transmitter puts out .5db on low power a 10db attenuator will reduce that to .05db.

Edited by Mr. P

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Brandon, the FCC measures radiation with some equipment that most folks certainly don't have, or have access to. The rule of thumb is if you keep your transmitter on the lowest power setting, and have it radiate out about 200ft. Test this by using your car radio, drive away from your house. If you are picking up the signal more than several hundred feet away, you may want to think about using attenuator like Mr. P suggested.

 

I know some go through the hassles of creating a di or j pole antenna. I have a lot of trees and live in a rural area, and I now stick with just a rubber whip antenna. I have no problems. I am a bit out of compliance myself, but not much.

Edited by zman

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I don't want to hijack this thread but I don't know if it is OK to use a transmitter in the UK.

 

I want to use either the whole house transmitter or preferably the CZH05b.

 

I started a thread on the Blue Rooms and they say I shouldn't, but many displays in this country do and have not got in trouble.

 

http://www.blue-room.org.uk/index.php?showtopic=65405&st=0

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I purchased the Sansonic version and am very impressed with it.  I did a bunch of power/range tests with it after I got it.  For now I have it fine tuned it to give me just the right amount of range for the display, nothing more, and it has great clarity. 

 

I also did a FULL power test just to see how far I could hit it.  I could still clearly hear my transmission that day about five miles away.  (your results may be different)  It almost scared me how far it transmitted.

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According to members on the Blue Rooms, broadcasting music like this is completely illegal.

I use to live in the UK and I remember all the licensing requirements. Now I don't know if those laws are still in place now or not. The dreaded TV tax and I think there was a radio tax too back in those days. Those were for watching TV and if the radio tax was real ( I don't know), for listening to the radio. I did have the TV Tax guys come to my small place over there wanting to see my receipt for paying the TV tax...which I didn't have. Fortunately for me, the antenna wire was laying on the floor disconnected and I was watching a video. It is illegal over here to play copyrighted material over the air and it's illegal to broadcast on the FM radio without a formal FCC license. There are allowances for very small power outputs as I'm sure were already stated in this thread. I'm taking a wild guess that the UK is the same or far more controlled. If that old radio tax still exists, then you have a problem. Again, never confirmed the radio tax when I was over there, but the TV tax was real.

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Yes. Everyone needs a TV license. It is better that way because then we don't have to watch adverts on the BBC.

 

 

Apparently it is illegal to broadcast copyrighted music over FM and advertise the frequency, even on low power. I think nearly everybody on here does that.

 

Also apparently I need a PRS licence, but I'm not going to get one, as nobody I have asked on here has one.

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I have the older version of this. Going into my 4th year. So far it has been a great Transmitter.  I think my neighbors like it too cuase they don't have to listen to the music over and over and over again.

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To be courteous to the OP, for the discussion around the UK issues, you may want to start a separate thread, with a descriptive title to get more relative and pertinent input and keep this thread US based.

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Got my CZE-05b today. Put the antenna on and plugged it in and pressed the power button and nothing. Completely dead. Very frustrated considering I was looking very forward to having good reception. Ordered it from Newegg which came from China. I guess I will have to send it back and decide what I should get now.

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I am not sure if this is the same model radio as you got. But I have heard this happen several times. The problem is that the owner did not read the manual. From what I remember hearing in the past. The radio in question requires a special first time start up. Pay close attention to the manual and see if there is something you have to do the first time you power up.

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Max-Paul, I wish that were the case but my manual says nothing about a a first time start up. It only says to make sure antenna is connected before powering on. 

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That's the first time I've heard of one of these not working but MaxPaul has more knowledge. I'm not using one but hear they are pretty good. 

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There is another person commenting on this thread that has the same problem as I do. DOA

There is another person commenting on this thread that has the same problem as I do. DOA

Whoops. I didn't mean to post that twice.

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I found a different 2 amp rated power supply at home today and decided I would try that just in case the power supply with it was no good. I put the antenna in, hooked up a different power supply and guess what? It powered on.So, with that said the unit does work and the power supply that came with it is no good. I will hopefully test it out tonight and hear crystal clear reception. If anyone else runs into this issue check your power supply.

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Well, did a test of the transmitter today and wow. Great clarity and it carries a nice distance. I tested the high setting just to see and it went a good 4 blocks before I lost reception. I turned it back to the low setting and it is perfect for what I need it for. Even though the power supply was bad I am very happy with the performance. Hopefully no more static this year!!!!!!!!!!!!!!!!

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I fired mine up today for the first time. Took a few times of powering on/off and pulling the audio cord in and out. I got great clarity. Then i went and moved the transmitter and now i get a buzzing sound when in between songs... any idea why? 

 

Could it be my audio cord? I'm using the audio (transmitter) to headphone jack on my laptop.. FYI. its still there wither i turn the audio on my laptop up/down.

 

LMK your thoughts?

 

Thanks

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I fired mine up today for the first time. Took a few times of powering on/off and pulling the audio cord in and out. I got great clarity. Then i went and moved the transmitter and now i get a buzzing sound when in between songs... any idea why? 

 

Could it be my audio cord? I'm using the audio (transmitter) to headphone jack on my laptop.. FYI. its still there wither i turn the audio on my laptop up/down.

 

LMK your thoughts?

 

Thanks

Check to see if you have other electronics nearby where you moved it to -- you may be picking up interference from that.

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I fired mine up today for the first time. Took a few times of powering on/off and pulling the audio cord in and out. I got great clarity. Then i went and moved the transmitter and now i get a buzzing sound when in between songs... any idea why? 

 

Could it be my audio cord? I'm using the audio (transmitter) to headphone jack on my laptop.. FYI. its still there wither i turn the audio on my laptop up/down.

 

LMK your thoughts?

 

Thanks

Check the antenna connection and insure you didn't somehow break the ground connection on it. This will result in an AC hum coming out. I don't know what this transmitter looks like but on my EDM, the antenna is a simple RCA output connector. I dropped mine once, it failed the solder joint and caused the AC hum. I resoldered it and no problem.

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I would buy a ferrite snap choke from Radio Shack and put it on your power cord before you look at resoldering. Ensure your power cord is not close to your antenna, or your output cables. Keep them all as separated as possible.

Edited by zman

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