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Radio Road Which tuner to get and getting the most from it. Thank God, for the radio! |
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Radio Road Which tuner to get and getting the most from it. Thank God, for the radio! |
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In Reply to: RE: Best de-multiplexer to copy? - Don't bother posted by stellavox on February 29, 2008 at 11:55:38:
The board you're referring to is built around the LM4500 chip, which is a later generation MPX chip with low distortion and anti-birdie circuitry.
from this site
http://rbsfm.ej.am/joomla/index.php?option=com_content&task=view&id=53&Itemid=30
LM4500 - FM Stereo Demodulator
Written by BuSan
Tuesday, 21 November 2006
Description
"The LM4500 is an improved stereo demodulator IC offering very low audio distortion. A new demodulator technique minimizes adjacent station interference caused by subcarrier harmonics and prevents lock-up problems from pilot carrier frequency harmonics. The IC features a blend circuit which optimizes the signal-to-noise ratio under weak signal conditions by gradually combining left and right channel information."
I measured .035% distortion driven by a KT-8300 at full modulation. I designed the LM4500 board mostly for my own use, and then to supply friends who wanted it. The site for info is www.FMMPX.com
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Follow Ups
- RE: Best de-multiplexer to copy? - Don't bother - BFitz 02/29/0814:04:47 02/29/08 (4)
- Nice Job Bob - stellavox 04:12:04 03/1/08 (3)
- RE: Thanks - BFitz 08:03:10 03/1/08 (2)
- Filters - stellavox 10:58:57 03/1/08 (1)
- RE: Filters - BFitz 12:41:25 03/1/08 (0)
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