Spectrum of a continuous carrier from an IC7800.
The serial number is 0301012 and the output power 200W.
The sideband noise is only a few dB above the internal
noise floor of the WSE/Linrad system so a second measurement
was made with the carrier moved outside the visible window
where the Linrad/WSE system can tolerate much stronger signals.
Everything the same as above except that the transmit frequency
is changed from 14.125 MHz to 14.175 MHz and the attenuation
is 20 dB smaller.
A comparison shows that the noise of the Linrad/WSE system
contributes by about 1 dB in figure 1. In figure 2 it
does not contribute at all.