As with any technological change, there are many myths, past truths or part truths that get repeated endlessly and out of context by those frightened or challenged by the change. Software defined rad
http://www.ab4oj.com/test/main.html#NPR gives unbiased account of the behaviour of 16-bit ADC under strong signals! There is only one input to ADC IC and even a single strong signal close to overflow
Not nearly as unbiased, not nearly correct, as it purports to be. The Noise Power Ratio Test is especially problematic -- the level of the test signal is not a constant, but is adjusted to depend on
test signal is not a constant, but is adjusted to depend on characteristics of the radio being tested. HF is noisy and overcrowded by powerful broadcasting signals and over_the_horizon radars. Semic
Mark, I thought for a long time that a carrier as a steady signal but in the case of ADC it overflows only at the short peaks and it can often be tolerated! Weak signal can be detected by human opera
Hi Mario, My experience during many experiments is that weak signals just around or above the noise level, totally disappear on many DSP based receivers as soon as you switch from carrier to modulate
The NPR test is flawed because of its reference MDS. MDS is measured using a STEADY carrier. As soon as you modulate a weak signal carrier, it disappears in the band noise of most DSP based receivers
Unbiased? Have you taken a look at his Icom fanboy pages? http://www.ab4oj.com/icom/main.html It's like saying Rush Limbaugh or Rachel Maddow has a new page giving "unbiased" reviews of the president
N9AA wrote: Unbiased? Have you taken a look at his Icom fanboy pages? Scott, I checked AB4OJ NPR pages again and now I notice deep bias against Kenwood as none of their radios was tested! I am sure t
The fundamental idea of the NPR test is a VERY good one -- properly done, NOT with a sliding reference level, is to expose the contribution of spurs and phase noise. It is the "sliding reference leve
"There are many very nice things about SDRs, but they have two Achillies' Heels -- 1) dynamic range of their input stage is not great enough for most contesting . . . "#1 can be eliminated for overlo