Roelof - I can confirm its like adding a 50dB attenuator to HF and long range MF/LF signals here. Very fast onset and slooooooooowwwwwer recovery- thats typically from just outside of the Auroral Oval (depending on how South its moved) but inside the Oval say at 83N its like being in a partially mirrored fish bowl with a large diode effect. You can often still hear DX MF and LF signals at very very low levels but (mostly) the noise levels are really low - so low Ive taken front ends apart to find the problem.
Laurence KL7 L
> To:
[email protected]> Date: Thu, 3 Oct 2013 20:00:51 +0200
> From:
[email protected]> Subject: Re: LF: No TA on MF :-(
>
> Hello Stefan,
>
> I study propagation of Canadian NDB's in the range 200 - 520 kHz by means
> of a PERSEUS spectrum recoding from 200 - 600 kHz. This recording runs
> every night.
