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Re: LF: TXing on VLF again, A fan in series to the antenna?! :-)

To: [email protected]
Subject: Re: LF: TXing on VLF again, A fan in series to the antenna?! :-)
From: DK7FC <[email protected]>
Date: Sun, 17 Apr 2016 22:12:00 +0200
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Hi Paul,

I had to shut down in the morning due to HV breakdown of the cable. No fire or similar problems ;-) However, i've made a few changes in the afternoon. One of them was putting the ferrite transformer (making 300V rms out of the voltage of the audio amplifier) on the top of the roof, so the 8.27 kHz sound is not nerving others during a working day. For that reason i wanted to re-calibrate the amperemeter. I applied an input signal to just one of the channels but the output was bridged :-( Now the PA module driver seems to be damaged. I don't want to spend to much time with it but there is no alternative except my large PA. But i like the idea of using an audio amp because it is linear and reduces harmonics when i'm transmitting 24/7. So we'll see. No transmissions tonite from me.
73, Stefan

Am 17.04.2016 21:57, schrieb Paul Nicholson:
DK7FC one hour averages in 278uHz, stepping 30 minutes.
Flux density and phase lead, by start time.

 2016-04-16_22:00:00  0.13 fT  141.8 deg
 2016-04-16_22:30:00  0.10 fT  121.1 deg
 2016-04-16_23:00:00  0.08 fT  112.3 deg
 2016-04-16_23:30:00  0.08 fT  112.3 deg
 2016-04-17_00:00:00  0.10 fT  130.0 deg
 2016-04-17_00:30:00  0.07 fT  133.5 deg
 2016-04-17_01:00:00  0.03 fT  120.3 deg
 2016-04-17_01:30:00  0.05 fT  127.0 deg
 2016-04-17_02:00:00  0.07 fT  136.1 deg
 2016-04-17_02:30:00  0.08 fT  132.6 deg
 2016-04-17_03:00:00  0.06 fT  135.8 deg
 2016-04-17_03:30:00  0.05 fT  169.8 deg
 2016-04-17_04:00:00  0.05 fT  127.4 deg
 2016-04-17_04:30:00  0.07 fT  121.1 deg
 2016-04-17_05:00:00  0.06 fT  156.9 deg
 2016-04-17_05:30:00  0.06 fT  163.7 deg
 2016-04-17_06:00:00  0.04 fT  156.6 deg

For a fair comparison of recent tx changes you
might have to tx 20:45 to 22:30.

Just experimenting now to see what symbol and message
lengths ebnaut can use.
Paul Nicholson

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