BH1417 Stereo PLL FM Transmitter

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This is the latest BH1417 FM Transmitter design from RHOM that includes a lot of features in one small package. It comes with pre-emphasis, limiter so that the music can be transmitted at the same audio level, stereo encoder for stereo transmission, low pass filter that blocks any audio signals above 15KHz to prevent any RF interference, PLL circuit that provides rock solid frequency transmission (no more frequency drift), FM oscillator and RF output buffer.

There are 14 possible transmission frequencies with 200KHz increments that users can select with a 4-DIP switch. Lower band frequencies start from 88.7 up to 89.9 MHz, and upper band frequencies start from 107.7 up to 108.9 MHz.

BH1417 can be supplied with 4 - 6 voltage and consumes only around 30mA, providing 20mW output RF power. BH1417 provides 40dB channel separation which is pretty good, although older BA1404 FM Transmitter chip provides slightly better 45dB channel separation.

Read More Source:
http://electronics-diy.com/BH1417_PLL_Stereo_FM_Transmitter.php
Thank you.

This entry was posted on Tuesday, December 18th, 2007 at 7:28 pm and is filed under RF-Radio Frequency, fm transmitter. You can follow any responses to this entry through the RSS 2.0 feed. You can leave a response, or trackback from your own site.