AGC threshold, the purpose beneath which audios falls off quite linearly with signal, is listed in microvolts across the antenna enter . Also listed is the drop in audio-output degree on the AGC threshold, as in comparison with a 5 mV (usually S9 + 40 dB) signal. Tests had been made utilizing a 500- or 600-Hz CW filter, when available.
Dynamic-vary measurements had been made utilizing two equal-strength take a look at signals 2 kHz aside to approximate a “actual-life” pile up, plus then extra regular 20 kHz spacing. A few radios needed to be tested at 50 or a hundred kHz because of synthesizer noise. Some units, due to limitations within the i-f filters or board layouts, had extreme take a look at-sign leakage, requiring shut-in measurements be made at 3- or 4-kHz spacing.
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This shows whether or not indicators two to four filter bandwidths … Read More