[Boatanchors] Using a SG-230 tuner on AM

[rbethman]

The reference states that you must specify what ZERO - OR - the 
reference point for calculations are based upon.

You obviously do NOT have any of the references, as the accompanying 
table goes from 6 micro-micro watts up through 6000 Watts.

It is in power.  I have given the formula, the cited reference by page, 
edition, and date.

Whether you start with a reference of 0.006 W or start at 100 W, when 
you use the formula, Log Base 10, the results are the same.

Bob - N0DGN

Gary Schafer wrote:
> That person was stating that doubling the VOLTAGE gave a 6 dB increase (4x
> power) in power.
> The person stating that when doubling the voltage is 4 times the power is
> correct. That would be 6 dB. You can look that up on a dB table that shows
> volts as a reference rather than power. Or take 20 log of the voltage rather
> than 10 log for power.
>
> Just do an easy example with ohms law. 100 volts across 50 ohms is 100
> squared divided by 50 or 10000/50 = 200 watts.
>
> Now double the 100 volts to 200 volts. 200x200 = 40000/50 = 800 watts. That
> is 4 times the power. Or expressed in dB that is a 6 dB increase.
>
> And yes when you double the voltage across a given load the current also
> doubles. You can verify that with a little math too. Just another way of
> expressing that power increases by a factor of 4x.
>
> The problem with your table that you reference is that we are NOT starting
> out with .006 watts as the reference.
>
> 73
> Gary  K4FMX
>