[SOC] A question for you

[D.J.J. Ring, Jr.]

How slick is that, Tom.  I've been refusing to do odd dB conversions that I
don't remember because I have no access to a logarithm table.

2 dB = 1.259*(1.259) = 1.585 times 200 =   217.0

Now what do I do with my Picket Circular Slide Rule and Chemical Rubber
Corp log tables from skool?

Even old goats learn something new.

73
David N1EA



On Thu, Aug 28, 2014 at 2:50 PM, Thomas Spencer <tbspencer at windstream.net>
wrote:

> Let's skip the formula for a moment. Each db increase has a multiplier
> value
> of 1.259. So applying that to your problem 200x(1.259x1.259)=317.0162. Each
> 3 db is approximately a doubling of the power (1.259x1.259x1.259). For
> power
> increase multiply , for power decreases divide. I hope that sheds some
> light
> on the problem.
>
> Tom AK4NY
>
> -----Original Message-----
> From: SOC [mailto:soc-bounces at mailman.qth.net] On Behalf Of Randel
> Livingood
> Sent: Thursday, August 28, 2014 1:54 PM
> To: Operators' Club Second Class
> Subject: [SOC] A question for you
>
> I am beating my brains out trying to figure out Effective Radiated Power.
> The formula appears to be:
>
> ERP= Transmitter power X 10 (+- antenna gain/10)
>
> the example given is 200 w transmitter output with an overall gain of 2db.
> So if my thinking is correct it would look something like this:
>
> 200x10x 2/10
>
> The answer given is that the output is 317 watts.  Can anybody help me see
> the light?
>
> Randel
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