[Elecraft] [XG-2] A little help with math

[Don Wilhelm]

Ken,

I believe those units are already dBm - nothing else makes sense, and 
there is a missing minus sign on the last one.  +81.5 dBm would be a 
very large signal - 141.3 kilowatts into 50 ohms - minus 81.50 dBm does 
make sense.

If you want a handy tool for dB calculations, you may want to download 
the mini dB calculator by DL5SWB.  Google for the website.

73,
Don W3FPR

Ken Bessler wrote:
>  Here's a quote from a 2006 post W3AB made:
> =============================================
> A while ago someone asked a question about the above. I
> didn't see a reply so I just built a XG2 and checked it with 
> a HP 8562A spectrum analyzer, the DUT connected directly 
> into the SA without any cable. I repeated the measurements 
> three times over the course of 1 hour. They didn't change      
>       
> Frequencies in MHz and the Po in dBm.      
>       
> 80M - 03.579 = 03.57910 @ -75.00 & -106.3      
> 40M - 07.040 = 07.04015 @ -73.67 & -106.0      
> 20M - 14.060 = 14.05982 @ -73.50 & -105 8      
> 3 X 40M = 21.12052 @ -85.33      
> 4 X 40M = 28.16077 @ -93.67      
> 2 X 20M = 28.11962 @ 81.50      
> =============================================
>  
>
> I hate to admit it but I'm having trouble with those last 3
> values (-85.33, -93.67 & 81.50). Are they Po in mV? Can 
> anyone convert those to -dBm for me? I tried to e-mail W3AB
> but it's bouncing. Help? Thanks!
>
>
> 73's de Ken KG0WX - Kadiddlehopper #11808, 
>         Flying Pigs #-1055, Grid EM17ip
>
>  
>  
>  
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