On Wed, Apr 6, 2022 at 06:57 PM, <groups@...> wrote:
Is anyone aware of a reference that describes the fading improvements that might be had by using an elliptically polarized antenna instead of a linearly polarized antenna to receive low-angle skywave transmissions on HF? ?Most literature I read seems to focus on linear receive antennas.?
Most research / experiments of this nature have been focused on X and O wave propagation, typically using NVIS propagation on bands around 5MHz.
Some notes here
Some interesting notes on X & O wave propagation.
And also DSP applied to diversity reception and noise cancelling.
I think as an experiment, it would be fairly easy to put up a pair of crossed dipoles for 60m as inverted Vee's around a central support pole, and then with a phased 90 degree length of coax and some relay switching to swap between E-W / N-S / Clockwise / Anti-clockwise.
Regards,
Martin
