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Normal HF Noise Floor By Band And Location
Are you wondering how much noise is normal? This great table created by Basu-VU2NSB lists the normal noise floor by by Band and Location. See other great articles by Basu at https://vu2nsb.com/.
Radio Frequency Interference
The links below contain useful information for identifying and locating sources of RF interference.
RFI Reference Materials - ARRL
Potential Sources of Interference - ARRL
Locating RF Interference at HF - Tom Thompson WØIVJ
Q-Codes
Common Q-Codes from ARRL
Q-signals are a system of radio shorthand as old as wireless and developed from even older telegraphy codes. Below is a link to a great list of these codes.
Q-Codes - ARRL