Was it a sweeping "ray gun" type sound? If so, 99% chance it was CODAR. It's throughout HF and wrecks various bands, including Ham bands. Did you get a small recording? Kurt ----- Original Message ----- : 28.0155 MHz : 24.9010 MHz : 21.0230 MHz : 18.0918 MHz : 10.1222 MHz : Any one else hearing these pulses, and ideas to what they may be?