Does smoke haze affect VHF/UHF propagation?

[VK4WDM]

Hi Wayne

I dont know what frequency your working on there, but smoke probably has some effect of diffraction and scattering due to the differing densities of the smoke compared to normal troposphere, becoming greater as the frequency increases, to a point where it would almost completely be scattered or reflected at microwave frequencies.

BoM rain radars can plot smoke on the rain radar screen when its severe enough and thus must be a reflection of the signal back to the receiver.

Hello Leigh

The down-links from the satellites are 145 MHz and the up-links are 435 MHz.  They are in low orbit and I often work them when they are only 2 degrees or so above the horizon ( south coast of VK5 for instance) so the signals are traveling a long way through smoky atmosphere to get to and from the satellite.

Wayne VK4WDM