Message-ID: <5713EE10.3000008@posteo.de>
Date: Sun, 17 Apr 2016 22:12:00 +0200
From: DK7FC <selberdenken@posteo.de>
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References: <57101A93.9050904@posteo.de> <8D364FDC57083E1-13C0-757EEB@webmail-vm186.sysops.aol.com> <5710A5DD.7040300@abelian.org> <5710BCBA.60901@posteo.de> <5711387D.7070600@abelian.org> <57134ADA.1020309@abelian.org> <5713EABF.70601@abelian.org>
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Subject: Re: LF: TXing on VLF again, A fan in series to the antenna?! :-)
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Status: O

Hi Paul,

Thanks.
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
> -- 
>