Typical Noise Floor on HF Radio Bands
Chart comparing expected HF noise levels by location type across the 80, 40, 20, 15, and 10 meter amateur bands.
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Category: Knowledge Center
Q-Codes
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.
Read moreRadio Frequency Interference
The links below contain useful information for identifying and locating sources of RF interference.
Read moreSuggested SCG Antennas — HF & VHF/UHF
SCG Ham Radio SIG presentation from April 26, 2019, reviewing HF and VHF/UHF antenna options for installations subject to community height and appearance restrictions.
Read moreThe Magic of Magnetic Loop Antennas
Bill Powell, W9WRP, explains the operating principle, tuning, selectivity, directionality, and practical advantages of magnetic loop antennas for amateur radio and space-constrained installations.
Read morePortable Backup Solar Generation Systems for Hams
Rusty, KJ6AMR, explains how to size and build portable solar backup power for amateur radio, including LiFePO4 batteries, PV panels, charge controllers, wiring, connectors, inverters, and radio duty-cycle calculations.
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