Hi Luis,
Am 31.07.2016 16:55, schrieb VIGILANT Luis Fernández:
Which capacitors do you plan to use to add those 1760pF ?
That one that i found in my junk box:
https://dl.dropboxusercontent.com/u/19882028/ULF/20160801_190228.jpg
I will see where i find the resonance. 2 nF is the measured value. If i
need a bit less, i will switch another one with a higher C in series.
That one can have a lower rated voltage then. For 1.76 nF i would need
14.67 nF in series to the 2 nF C. That one can have 800V only, if the
total voltage is 6.5 kV. The 2 nF type may not be ideal for RF
applications but at such a low frequency and just 12% of the rated
voltage i do not expect problems. I will see if the resonance moves away
at 6.5 kV :-)
You will soon see a 6 dB stronger signal on my grabber, probably this week.
I plan to add the VLF monitor in my remote (2nd QTH) at 7Km in Albir IM98wx
Not a perfect clean enviroment for low bands, but population is much reduced in
winter
so the man made noise sources too. I have a 5m mast for the miniwhip and would
be able
to hang a squared (diamond shaped) loop there oriented to central Europe
Yes, the idea is to keep a permanent grabber and be useful for you, Markus or
the Italian group
working at VLF and beyond. A remote Rx at 7Km has proved to be a very useful
tool for me so far
and the plan is to keep it running
Fine. I'm looking forward to your results. Leaving a trace in your
location is not unrealistic, at least on 8.27 kHz!
73, Stefan
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