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

iMac · 2nd June 2012, 12:45 PM

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

2nd June 2012, 12:45 PM	#1
iMac diyAudio Member Join Date: Sep 2005	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?

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2nd June 2012, 10:52 PM	#2
mickeymoose diyAudio Member Join Date: Nov 2008	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

2nd June 2012, 11:05 PM	#3
mickeymoose diyAudio Member Join Date: Nov 2008	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