- FM-Broadcast station -
2006.08.10 The idea was to try to put together a working fm-stereo broadcast station on a small budget. The core component is a PC with the SAM-Broadcaster software from http://www.spacialaudio.com
AF-Signal (Audio) is then feed from PC / or microphone to a mixer, the mixer's main job is to alternate Broadcast Program material and music stored on the PC with 'live' audio from the 'Studio' microphones. It's also possible to connect other audio sourses to the mixer s.a. DAT or DVD-Player's.
Audio is tapped from the mixer's sub channels and processed by the compressor / expander / limiter and the returned to the mixer's main channel, the mixer also controles studio monitor speaker / headphones functions.
FM-Broadcast station
MPX-Board
MPX-Board SE-3+
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Audio Response .............. 20Hz-15KHz
Audio Input Impedance ....... 600 Ohms, unbalanced
Audio Input Level ........... 0 dB (1V Ueff)
Audio output Level .......... 0 dB (1V Ueff)
Easy to change if needed
Distortion .................. <0.1%
S/N ratio ................... -80 dB
Separation .................. >45 dB typ.
Pilot Frequency ............. 19 KHz
Pre-emphasis ................ 50uS or 75uS selectable via jumpers
Limiter ..................... is built-in
Output Impedance ............ 75 Ohms
Power Requirements .......... 12-18V DC stabilised / 40mA
PC Board Size ............... 100x65mm
Audio connectors ............ all RCA jacks are mounted on the board
Control ..................... On-board Stereo/Mono switch with LED indication
19KHz sync output ........... 0-5V square, TTL compatible
Power connector ............. Either coaxial power connector (+ center)
or easy to connect screw terminals
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CPU and Transmitter board
Mixer
 Studio Monitor speakers |
 Studio Microphone |
Hardware =========================================== PC-Soundcard : M-Audio Delta AP192 Compressor / Limiter : Samson S-Com Plus Equalizer : Technics SH-Z200 CPU / Transmitter board : PCS-Electronics MPX-Board : PCS-Electronics SE-3+ Mixer : Behringer EURORACK UB1204-PRO Monitor speakers : Roland EDIROL MA-10A Studio Microphone : ADK A-51 Type V ===========================================
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