[Elecraft] P3 SVGA - measuring occupied bandwidth

[Jim Brown]

On 5/23/2018 6:47 AM, Joe Subich, W4TV wrote:
> The greater difficulty is in measuring the occupied bandwidth of very
> narrow modes (e.g. JT65, JT9, FT8, RTTY or even CW) due to the 2 KHz
> minimum span of the P3 ... a 500 Hz span would be better for measuring
> narrow modes. 

Not so difficult at all, using the methods I outlined in a previous 
post. I have successfully used it on RTTY, CW, PSK31 an a steady 
carrier. Most of that data is summarized in this Power Point pdf. Most 
of these data are from the SVGA.

http://k9yc.com/P3_Spectrum_Measurements.pdf

Note -- TXEQ in my K3s are set maximum rolloff of the 50, 100, and 200 
Hz octave bands and some rolloff of the 400 Hz band. This accounts for 
the difference in the shape of the top of the curve between my K3s and 
other rigs tested.

73, Jim K9YC