Noise?

[Joevano]

Total newbie here. I have an SDR Play1 connected to a discone at 25’ with LMR 400 to the lightening arrestor, and RG8X fed into the radio. I have noise on all bands as you can see in this pic. What is this from?

[NK7Z]

Probably a switching mode power supply... See:
https://www.nk7z.net/sdr-rfi-survey-p1/
for a bit on how to ID some of this stuff.

Also see:
https://www.nk7z.net/rfi-snapshots/

for an ever growing catalog iof RFI sources.

[g1hbe]

You won't get good signals on the HF bands from a standard discone, they are for VHF only. A long wire or dipole (depending on your circumstances) is more suitable. A low noise solution is an active loop like the Wellbrook 1530.