high frequency

Hello, I'm being attacked daily by an electromagnetic pulse, feels like a sharp knife stabs to the brain in an instant. Law enforcement can't even comprehend it when I report it to them. 🫤 This EM weapon has been publicly documented as "Havana Syndrome". What is so strange is that there is...

First of all: I'm a complete beginner :oops: I want to listen to the shortwave bands with my RTL-SDR dongle (V4). I only want to receive - not transmit. The simplest setup is supposed to be a long wire antenna. I wanted to order a few meters of copper wire for this. Now I have a few questions...

Hi all, ive ran into an interesting issue with my Xiegu G90 HF transceiver, the quick run down is at any point where VSWR is high through any antenna, the radio will transmit clear audio, but when VSWR is low or perfect even, the audio comes out like a cyclic buzzing sound, the Receiver used is...

Very good conditions recently for Rx the NOAA HF transmissions, especially on 33m (9110 kHz). Some of the maps in the last few weeks are the best I've ever received. For those interested in giving it a try - here is the transmitter schedule. I find (here in New Hampshire) Boston the best, then...

This is a most interesting low power HF system using 954 FCC licensed frequencies. It is a derivation of a Harris waveform and protocol. http://www.hysky.com Does anyone have a recording of the HF signal? Is there a list on RadioReference of the FM stations they use to broadcast their...

Could anyone suggest a low profile mobile HF antenna? I am especially interested in the 39-42MHz range, but also want the antenna to be discreet. Any suggestions welcomed.