Really have to know the impedance. Assuming the standard 600 ohm audio
impedance, calculate the voltage that would be 1 milliwatt. That voltage is
zero dBm.
Take it from there.
----- Original Message -----
From: "Mark Erbaugh" <mark@microenh.com>
To: <tentec@contesting.com>
Sent: Friday, July 25, 2003 21:40
Subject: [TenTec] 5 mV = -67 dBm
> According to the specs on my Pegasus, the microphone input is 5mV or -67
> dBm. Could someone explain the relationship between mV and dBm?
>
> I just acquired a closeout Radio Shack mixer. The line output is 2V. Would
> it be possible to use a simple resistor voltage divider to bring the
voltage
> down to a level suitable for mic input to the Pegasus? If so, what would
be
> the recommended values? Or is there a better circuit?
>
> 73,
> Mark
>
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