[BC] dbu to microvolts program
Richard Fry
rfry
Wed Apr 11 07:06:24 CDT 2007
Mark Humphrey wrote:
>However, when I convert from dBmW to voltage across 75 ohms,
>I get 1.53 mV, which is about 31 dB less than 55 mV, and I
>assumed no line loss. Am I missing something?
_____________
Mark,
No, you are not. I'll blame it some glazed neurons, but I neglected to
convert the power into watts before I solved for the voltage. I used
milliwatts, which accounts for 30 dB of the difference. The other decibel
was in a system loss cell in my spreadsheet that I had left set at 1 dB
from the last calculation I had done. That's bad.
Fixing this gives me an answer of 1.54 mV, so we now are in agreement, or
close enough. Thanks for spotting the error.
Rich
More information about the Broadcast
mailing list