diyAudio - Adjustment of a Pioneer TX-9500II dB ->dBm?

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iMac	2nd June 2012 12:45 PM

Adjustment of a Pioneer TX-9500II dB ->dBm?

I have a Pioneer TX-9500II with a minor problem, the tuning meter doesn't seem to show centre frequency. With max signal read the tuning meter show offset fq. Have the SM but I stumble at ones at "output to 80dB" my signal generator only have dBm or dBuV (50Ω). Is there a way to convert dB to dBm/dBuV?

mickeymoose

2nd June 2012 10:52 PM

No, there is not. dB is a relative measurement without any reference. dBm and dBuV are relative measurements with a specific reference using the dB scale
The dBm is referenced to 1mW across a 600 Ohm load, the dBuV would be referenced as dB (gain/loss) against a uV referene (in this case an RF/IF signal)
dB by itself is not referenced to anything
E

mickeymoose

2nd June 2012 11:05 PM

Oops. I have to correct myself. In the dark days of electronics the dB was referenced to 1.73 Volts across 500 Ohms, equalling 0.006 Watts. E

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