Geoff said "A noise gate placed in the signal path can be a source of IMD products, even when it is not active.
IMHO a separate noise receiver which can be tuned over a limited frequency range above the band in use to avoid "real" signals, whose output inhibits LO drive when noise is present, plus the required delay in the signal path, is a useful recipe for a noise blanker." That's why shutting the LO off is such a nice way to blank. Except for the expected result of blanking itself, there's no new circuitry and no additional IMD when the LO is running. I had an idea of doing another noise receiver, also TRF, that tuned HF and thought I could combine the blanking pulses from both noise receivers. But ran out of steam and never tried to do it. W7AAZ ______________________________________________________________ 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
