¿ªÔÆÌåÓýKent, The red wire is just a wire acting as a antenna for injecting some signal into the circuit. The speaker is just hooked up to the BitX40 in normal fashion using the onboard audio amplifier. You could use a simple RF generator and a probe to do the same thing. ?Farhan is just using stray RF noise to test the different stages. Joel Caulkins KB6QVI On Dec 26, 2016, at 4:52 AM, Kent Vanderploeg kvanderploeg@... [BITX20] <BITX20@...> wrote:
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