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WTB : LPAM Part 15 Transmitter BCB
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Peter Wieck wrote: On Aug 26, 6:10*pm, Syl wrote: Peter Wieck a écrit : For the money, and if you can get to Kutztown, I will have a consignment of SSTRAN AMT3000 units. $80, including all taxes and with the SMT chip already installed. Peter, That transmitter is NOT FCC part 15 compliant for what I know. This would be misleading as the OP requests a part 15 transmitter BCB. From the website: · Legal to use in the US, no FCC license required · Fully compliant with FCC Part 15 regulations · 100 mW input power · 100% Modulation · 20Hz to 20kHz ±1 dB Audio Response · Very Low Distortion · Adjustable Audio Compressor/Limiter This is a misleading statement, the SSTRAN AMT3000 does not include a limiter, manufacturers claims not withstanding. A traditional limiter as used with AM transmitters controls the modulation peaks, either by a clipping operation, or with a high speed peak activated AGC amplifier, the SSTRAN AMT3000 includes neither of these circuits. The so called "Compressor/Limiter" used in the SSTRAN AMT3000 is an RMS controlled AGC amplifier with a knee in its compression curve. The RMS control means that it doesn't pay any attention to the peak levels that cause over modulation. SSTRAN calls it a "Limiter" because of the knee in the compression curve, but it fails to operate as expected of a limiter to prevent over modulation. -- Regards, John Byrns Surf my web pages at, http://fmamradios.com/ |
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