In addition to Motorola, didn't Collins use this approach with the KWM-2? I recall the noise receiver as operating around 40 MHz, which is a peak frequency for spark plug noise.
Jack K8ZOA Ken Kopp wrote: > The initial patent for the concept of a separate "noise receiver" > detecting noise and blanking the IF system was issued to Motorola > for use in their "low band" ... 27 - 54 mHz ... 2-way radios. They > called it a "range extender", and this was the label on the control > heads that turned the feature on and off. > > 73! Ken Kopp - K0PP > [email protected] > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[email protected] > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > > ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
