FM Stereo Encoder MultiPLEXER BroadCAST PCB (PIRA) ReDesign/Edit from moutoulos ...
This stereo encoder is a halfway between analogue and digital processing. It combines the best from both domains to provide
high-quality and easy to build device. The sampling frequency used in
this stereo encoder is 97 times (!!!) higher than the pilot
tone frequency. This makes very easy to reject all spectral residues around the sampling frequency without affecting the main
signal characteristics. Using of a micro-controller allows to build
this stereo encoder with reduced part count and get excellent
results in real operation.
This stereo encoder advisedly does not contain any preemphasis circuit. Remember the key fact: a compressor/limiter/clipper
device must be always present between the preemphasis circuit and the stereo encoder or modulator. Only this configuration
ensures loud sound without exceeding the maximum frequency deviation limit (75 kHz). The stereo encoder is designed to
provide really good sound. This always needs to use the compressor/limiter/clipper device where the preemphasis is precisely
assured.
Supply voltage: ---------------------------------------- 9-16V (Stab) Quiescent supply current (12 V): --------------------------- 34 mA Audio 19 kHz rejection: -------------------------------------- 40 dB Channel separation at 1 kHz: ------------------------------- >55 dB Subcarrier rejection: ----------------------------------------- >60 dB Pilot sampling frequency: --------------- 1.843 MHz (19 kHz x 97) Subcarrier sampling frequency: ----- 1.843 MHz (38 kHz x 48.5) Pilot sync. output: ------------------------------------------------ TTL Max. audio input voltage: ----------------------- 5Vpp (1.75 V rms) Pilot tone level: ----------------------- Linear Adjustable 0-0.5Vpp Output voltage gain: ----------------------- Linear Adjustable 0-1.5 Audio input impedance: -------------------------------- 2000 Ohm RDS input impedance: ---------------------------------- 1000 Ohm MPX output impedance: --------------------------------- 500 Ohm Pilot sync. output impedance: ------------------------ 10000 Ohm Signal-to-noise ratio: --------------------------------------- >70 dB
Read Before Buy-Bid: I don't sell instruction for this project, only PCB. From the day order under normal circumstances, shipping takes approximately 10-14 business days.
This is one piece. More pieces (quantities) it is possible, but contact me first.
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On Jul-02-13 at 23:44:38 PDT, seller added the following information:
