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Re: LF: Test signal on 5.33 kHz

To: [email protected]
Subject: Re: LF: Test signal on 5.33 kHz
From: DK7FC <[email protected]>
Date: Mon, 08 Aug 2016 11:13:30 +0200
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Hello Uwe,

Yes since yesterday 14 UTC i am back on 2970 Hz. And the signal is about 5 dB stronger now, as you can see on my remote grabber.
The antenna current is not stable (but the phase is!), the parallel C seems to have a high temperature coefficient. You can see a slow peak in the antenna current during sunrise and sunset. This is when the resonance is pasing 2970 Hz :-)
In the coming days i like to install my transductor to control the resonance frequency to compensate the drift. However the phase meter does not work properly on 2970 Hz. I will investigate...

A new portable 30 km experiment is in preparation....

Ah BTW i consider to leave 2970 Hz and move to 2970.0025000 Hz. It may be a better frequency to detect my signal from a simple carrier. Or maybe i just do QSY during this experiment because Renato Romero is running a 1.26 uHz spectrogram on 2970.0000 Hz which takes about 2 weeks if restarted :-)

73, Stefan

Am 07.08.2016 22:38, schrieb [email protected]:

impressive work, Stefan.

Are you back on 2970Hz now?

yesterday at 0830UTC lightning destroyed  the soundcard and the LT1028 of the active abtenna.
but QRV agn, ahm SL acquisition status at times: 34%.




Von: DK7FC <[email protected]>
Gesendet: 07.08.2016 14:32
An: <[email protected]>
Betreff: Re: LF: Test signal on 5.33 kHz
The experiment was stopped at 12:25 UTC.
The loading coil holds the high voltage. Now i will order another 2 kg
of 0.4mm wire to add more turns...

73, Stefan

Am 07.08.2016 12:20, schrieb DK7FC:
> Hi VLF,
> Since 10:08 UTC i'm running a test transmission on 5330 Hz. About 240
> mA antenna current leads to 12 kV across the D.U.T., my new loading
> coil which is intended for 2970 Hz. So far the inductance seems to be
> 1.9 H.
> I want to check if it actually holds the high voltage as to my
> estimation before i continue to add more turns. The estimation is that
> each winding stack has to hold 5 kV. I will then end up somewhere
> between 30 and 40 kV at 2970 Hz...
> An image:
> If someone wants to check if the signal is detectable in some
> distance....
> The signal will be on the air for at least one hour.
> 73, Stefan
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