[BC] dbu to microvolt program

[Peter Moncure]

(RF reliably stated:)
>
> But any radiated or conducted voltage, once known, can be converted 
> from units of volts to X dB with respect to that value, at that point 
> of measurement.  They are just different forms of the same number. So 
> the simple equations I posted earlier will be valid.
>
> There is an equation that relates the amount of voltage at a point in 
> a conducted circuit to the amount of arriving field at the antenna 
> that it will take to generate that voltage.  That does include 
> consideration of the frequency (plus more).
Perhaps part of the confusion is the omission of the /M part of dB?, 
which is usually dB?/M, or decibels above a microvolt per meter, which 
is "in the air" and independent of an antenna.  dBm, OTOH, is measured 
at the Rx terminals and is therefore through an antenna and line of 
characteristic impedance.  So dB? to dBm conversions have a frequency 
term.  Note that the US treaty with Canada, which uses dBW, also lacks 
the formal precision--their term should also be dBW/M.  This treaty was 
a very poor one for the interests of the USA, and I have often wondered 
about the possibility of overturning/replacing it on those grounds.

-- 
Peter Moncure, VP RadioSoft
706.754.2725 -2745 FAX
PMoncure at RadioSoft.com
...a Customer Friendly Company