Does anyone see similar "humps"? I need to know what might be causing this?
The noise source may, or may not be in your home. I typically go to an Elecraft K3 on battery (to completely shut down the LAN) in order to systematically find any in-home noise source.
I am puzzled. Where to go from here? Is this a Flex problem? Is it that the noise floor on the K3 is that much higher? Both the K3 and the 6700 show a -120 db noise floor at 18 Mhz. There is a 20 db noise rise on the 6700 spectrum display from noise floor to hump peak. I am seeing essentially the same noise floor level on the K3's Nap3 spectrum, but NO hump.
I see similar results. I am using my K3 with a SDR-IQ receiver, tapped from the 8 MHz I.F. The Flex 6700's panadapter is significantly more sensitive. It's not that the noise floor of the K3 is higher, but the panadpater is not as sensitive as that in the 6700.
On the K3, tune in to where you would see the humps on the 6700. Put the K3 in wide AM mode and listen for hum as you slowly sweep the VFO through the hump. You may be able to hear the switch-mode hum but not see it on the K3. This was happening to me last week on 80m. Couldn't see the humps on the K3/SDR-IQ but could hear the hum on noise peaks. The 6700 detected it both with hum in the audio and the panadapter.
Thanks for the comments and suggestions received thus far.
I have turned off every device in the house but the humps remain. My closest neighbor is 1/2 miles away, so I can't believe it is from them. What about power company, could this be some of their doing?