Re: Why use a purpose built repeater box as a repeater rather than a transmitter, receiver, and controller tied (lashed) together?
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Adam Farson? VA7OJ? gives an interesting? method? of? phase noise testing of? HF? receivers? with his? NPR method? .
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The Basics: Every amateur radio station should be provided with the following minimal test equipment: A frequency-measuring instrument accurate to within 10 Hz.
www.ab4oj.com
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What is the standard method to measure phase noise? Most measurement?systems have pretty wide skirts that seem to be phase noise generated by themself, not actual phase noise from the transmitter.
Would this idea work: Characterize a notch filter, calibrate the notch filter to zero it out so it is a flat line with the notch filter in place, and then transmit through the notch filter tuned for the transmit frequency?
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Not unless you're talking about the PLL G.E. exciter.? In the offset frequency range of 12 kHz to 3 MHz a Kenwood TK-880 mobile has lower phase noise, as much as 20 dB lower at some offsets.
Bob NO6B
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