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Re: Aw: VLF: Ebino vs Anthorn on colour-DF ;-)

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Subject: Re: Aw: VLF: Ebino vs Anthorn on colour-DF ;-)
From: Markus Vester <[email protected]>
Date: Thu, 24 Apr 2014 11:15:35 -0400 (EDT)
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Laura,
 
very well, you are a keen observer! Yes I'm aware of the 2nd order intermodulation, happening in the low current BCY58 preamp stages which are powered by a DC level present at the notebook's microphone input. There's also a strong 9 kHz beat from AM broadcast carriers. I'll need to provide some lowpass filtering at the input.
 
Compared to the E-field antenna, the loops seem to pick up a lot of 50 Hz harmonics from adjacent underground cables, but apparently less of the 16.7 Hz modulated junk from the railway line.
Best 73,
Markus

-----Ursprüngliche Mitteilung-----
Von: LZ <[email protected]>
An: rsgb_lf_group <[email protected]>
Verschickt: Do, 24 Apr 2014 3:00 pm
Betreff: Aw: VLF: Ebino vs Anthorn on colour-DF ;-)




 
Hi Markus,

You wrote:
> Watch it live: http://www.df6nm.de/vlf/vlfgrabber.htm

Looks impressive and encouraging...

May be there are spurii from EFR visible at
14 kc (down-mixed/folded)
and
9.9 kc (intermod DCF49/DCF39)?

Laura

Sent from my Watson-Watt-Phone



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