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SLF: Sidebands arround ZEVS in 1 mHz

To: "[email protected]" <[email protected]>
Subject: SLF: Sidebands arround ZEVS in 1 mHz
From: DK7FC <[email protected]>
Date: Tue, 18 Jun 2019 17:51:16 +0200
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These days i'm calibrating the colours and angles in my ELF...VLF spectrograms. The colour of ZEVS is now calibrated to deviate less than 3 deg. However producing a spectrogram in 1 mHZ FFT bin width, i can see sidebands of ZEVS.
Did someone else observe a similar effect?
In a first thought i would assume it is my timing system that causes the problem. But maybe it is ZEVS itselfe? Or even propagation?
73, Stefan

PS: Capture attached.

Attachment: ZEVS.png
Description: PNG image

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