Re: [Elecraft_K3] K3/P3 video display on AM vs SSB
Hi Mel,toggle quoted message Show quoted text
I'm trying to understand the test conditions. Are the 100W SSB signal and the 1 kW AM signal transmitted from the same station on the same antenna? If not, then no direct comparison can be made.
I can easily believe the sidebands of the AM signal are 20 to 30 dB below the carrier. Say the audio has a 10 dB peak-to-average ratio. Right away that puts the average power of each sideband at 6 + 10 = 16 dB below the carrier, assuming 100% peak modulation.
Furthermore, if the P3 span is 20 kHz, then each display point is roughly 40 Hz wide, perhaps 1/100 of the total sideband, assuming 4 kHz audio. That's another 20 dB.
Here's something to try: Turn on peak hold on the P3 and watch the AM signal for awhile as the program content varies between music, voice announcements, ads, etc. You'll probably notice the sidebands are much flatter and higher in amplitude on the peak trace than on the real-time trace.
On 07/02/2015 12:36 PM, farrerfolks@... [Elecraft_K3] wrote: