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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 off frequency might be heard as undesired leakage. Ultimate rejection of one hundred twenty dB will not show leakage until roughly S9 + 60 dB. Receiver performance tests have been taken on present, popular receivers and transceivers.

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