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VLF: HWU dual frequency?

from [Markus Vester] [Permanent Link][Original]
To: <[email protected]>
Subject: VLF: HWU dual frequency?
From: "Markus Vester" <[email protected]>
Date: Thu, 13 Mar 2014 18:16:32 +0100
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A couple of days ago (Tue Mar 11), the high-power French Navy station came back on 21.75 kHz. This time they did not switch frequency, but continued to transmit on 18.3 kHz simultaneously. I wonder if they are using the same antenna for both carriers, which must be quite a challenge in terms of diplexer design and antenna voltage. This might give us a chance to compare diurnal propagation patterns on the two frequencies.
 
73, Markus (DF6NM)
 
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