I bought this transmitter off ebay at a discounted price and I can't figure out what these RDS "receivers" are supposed to do. They darn sure don't transmit RDS to a radio. I tried to contact the seller but they won't reply. Does anyone know about this?
If they are do not answer your question ASAP, don't be worry, they will answer it once start work.
Well with dialogue like that I would wonder too!!
RDS receivers..as they describe it...is not a receiver onto itself, but a feature in many FM radio receivers to display title data and stuff if a station is transmitting it.
You have to program that unit to send the RDS data and enable it from the front panel. Oh and you have to use a RDS data ENCODER in your audio chain for this to work...they seem to leave that out in their well written dialogue.
There are instructions in the product description. Good luck with the interpretation!
Gotta love them Chinese engineers. They do make "some" good stuff...but their instructions and guides are somewhat lacking in effective communication...much like their attempt at English.
Oh BTW, if I were you, I would slap an external low pass filter on that thing before attempting to use it....trust me.
Peace!
K-ROCKS RadioOne
ZeroPointRadio
AM Stereo 1670
FM Stereo 92.1
Thanks for the info RF. Now if only I could figure out how to throw RDS in the audio chain. :-) It seems to be pretty complicated with the winamp version of stereo tool and Breakaway BP.
The Chinese do make some cool stuff, but these ELE transmitters seem to have cooling issues. I'm going to cut a square under the case to mount the output final to a heatsink. For now, a CPU fan does the trick.
Wouldn't the transmitter have to accept a digital audio input in order to broadcast RDS? It seems to be analog only and I can't seem to get this to work.
No. RDS is transmitted on a sub carrier just like L-R audio and SCA audio is. The RDS sub carrier is modulated with 1.187Kb of data containing the display information.
The 57Khz sub carrier is injected into the transmitter via it's wideband input, which is the same input for MPX (38Khz sub carrier) from a stereo generator.
The transmitter merely needs to have the wide band input capability so as to be able to "see" the injected sub carrier and pass it through for amplification along with the main carrier it rides on.
Transmitters with a digital input are units built with the sub carrier generator already built in. The input simply feeds the sub carrier generator with the data. Any transmitter with a wide band input can have a variety of sub carrier generators attached to it and transmit those sub carriers on the main carrier. It is referred to as base band modulation.
Peace!
K-ROCKS RadioOne
ZeroPointRadio
AM Stereo 1670
FM Stereo 92.1
Am I correct in understanding that the wideband input is built into the 1/4 '' analog input? I was able to configure my stereo software to generate the pilot tone, but the RDS still doesn't show up on the receiver.
Make sure your sound card can sample at 96khz or higher and set it for that, otherwise it won't be able to inject the 57khz sub carrier from the software plug in.
Peace!
K-ROCKS RadioOne
ZeroPointRadio
AM Stereo 1670
FM Stereo 92.1
