![]() ![]() R8600 Pre Amp OFF, Squelch OFF, Audio Power meter REF set to 0 dB with no signal present: 130 dBm, 0.07 uV, broke squelch with scratchy audio. R8600 Pre Amp ON, Squelch set to 30% (just killed static): 118 dBm, 0.28 uV, broke squelch with usable but somewhat scratchy audio. R8600 Pre Amp OFF, Squelch set to 30% (just killed static): I set the audio power meter software REFERENCE to 0 dB (raw number was about -36 dB) with Squelch OFF and no RF signal input to the R8600. I took the audio out of the R8600 directly to the line input of the sound card. HP 8640B set to: 124.000 MHz, Internal AM modulation, 1000 Hz, 30% modulation. R8600 was set to: 124.000 MHz, AM mode, Default FIL 1, AGC OFF, Pre Amp was tried both ON and OFF, NB, NR, ATT, IP+, NOTCH all OFF. So, what follows may not be a true 10 dB S+N/N measurement, but should be somewhat close. I do have a HP 8640B and a software audio power meter (on the soundcard of one of my machines). So I really had not checked out the R8600 in AM and VHF. I never really use my R8600 on VHF air band more than extremely causally, just occasionally going to the local airport Unicom. Click to expand.Reading this thread concerned me a bit.
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