![]() ![]() bias level, & the configuration of the RF output stage(s). Maximum PEP is now determined by the collector voltage of the modulator, your audio, D.C. While the transformer multiplied voltage, the Darlington Configuration functions mainly as a current amplifier. The trade-off for achieving wideband frequency response, the radio will now make less power than before you started. With enough experimenting you can get Positive Peak Expansion/Negative Peak Compression type results, without a P.C. You'd have to get a little creative and work in some type of discreet feedback between the Audio source, Regulator & preamp/AMC. This way you wouldn't need to add any additional switching circuits for the audio chain, it's all there. If you wanted to stay (very) mobile you could modify the stock mic pre-amp (Goldfinger style) and simply use the 4 Pin Mic jack, You MUST employ some form of processing/limiting if you intend to bypass the Mic Pre-Amp (AMC/feedback circuit). The frequency spectrum of your audio signal will determine how wide you're transmitting.Īfter the Series Pass Modulator is installed, "Carrier Control" will be in your hands! Let's remove the audio bottleneck and Install a solid state modulator (darlington configuration used here). Modulation transformer is an obvious audio bandwidth choke-point or bottleneck when Hi-Fi experimenting. In high-level modulated radios such as Cobra 19/25/29's the "communications grade" ![]() Too long, didn't read: Discussion of series pass modulator modification, not a "how to". Wideband Audio Modification W/ Controlled Carrier Solid State "Ultra Modulation" Series Pass Modulator
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