Why Did I Start Testing Radios (page 2)?
•20 kHz Dynamic Range test showed that in a multi-conversion radio it was only testing the radio’s front
end
•If the first IF was 6 - 20 kHz wide, be it at 5 MHz, 9
MHz
or 45 - 70 MHz, the radio would overload in a pile up.
or 45 - 70 MHz, the radio would overload in a pile up.
•20 kHz test
showed no hint of the problem
•Solution: Place test signals close together so they pass through 1st
IF Filter " the
Next Amplifier " Mixer
•Close-in dynamic range numbers were ALWAYS drastically
worse than the wide-spaced numbers & correctly approximated a CW pileup
