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[129.206.22.206]) by mx.google.com with ESMTPSA id wj8sm3028543lbb.34.2014.10.03.13.34.12 for (version=TLSv1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Fri, 03 Oct 2014 13:34:13 -0700 (PDT) From: DK7FC <73dk7fc@googlemail.com> X-Google-Original-From: DK7FC <73dk7fc@gmail.com> Message-ID: <542F0842.7030304@gmail.com> Date: Fri, 03 Oct 2014 22:34:10 +0200 User-Agent: Mozilla/5.0 (Windows; U; Windows NT 6.1; de; rv:1.9.1.8) Gecko/20100227 Thunderbird/3.0.3 MIME-Version: 1.0 To: rsgb_lf_group@blacksheep.org References: <54281B0D.4040202@gmail.com> <1FEF5D3CDFAF4F5D9A31B0134D133FCF@White> <54296984.7080607@gmail.com> <542EFB24.5010300@iup.uni-heidelberg.de> <542F038A.1000804@freenet.de> In-Reply-To: <542F038A.1000804@freenet.de> X-Scan-Signature: 9be3f060697a097db7a337109fbeece1 Subject: Re: LF: ZEVS RX ant question, now success Content-Type: multipart/alternative; boundary="------------020803070406030909030406" X-SA-Exim-Scanned: Yes Sender: owner-rsgb_lf_group@blacksheep.org Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group X-SA-Exim-Rcpt-To: rs_out_1@blacksheep.org X-SA-Exim-Scanned: No; SAEximRunCond expanded to false X-Scanned-By: MIMEDefang 2.56 on 10.1.3.10 Status: O X-Status: X-Keywords: X-UID: 598 This is a multi-part message in MIME format. --------------020803070406030909030406 Content-Type: text/plain; charset=ISO-8859-15; format=flowed Content-Transfer-Encoding: 8bit Thanks Wolf, Yes, a good idea. I will try to catch it :-) But how do i know that it is the US mains instead of a 60 Hz monitor? Is the 60 Hz from the mains more stable? I will work on the circuit and continue tomorrow. Also i am curious about experiments near 2 kHz, now that i have a relatively clean RX site. I think about grounding the far end of my inv-L and run some 10A near 2 kHz. This vertical loop would have about 2100 m^2 beaming N/S. A RX loop could show some variation of the SNR due to the earth/ionosphere resonator... 73, Stefan Am 03.10.2014 22:14, schrieb wolf_dl4yhf: > Hi Stefan, > > The 82 Hz signal looks good... you may even catch a glimpse of "DX" > from the US and their 60 Hz mains with that setup. > It's several dB down on ZEVS but sometimes good copy here, on an > active E-field probe out in the woods (far away from old PC monitors > which sometimes operated near 60 Hz). > > 73, > Wolf DL4YHF . > > Am 03.10.2014 21:38, schrieb Stefan Schäfer: >> Hi VLF, >> >> This evening i received ZEVS for the first time in the garden :-) >> >> I used nearly the same circuit than in my email below. However, i >> found that the J310 was damaged! Remembers me on the old discussion >> if protecting diodes are necessary or not :-) But this is a large >> antenna, compared to an active E probe like the PA0RDT-antenna... >> Now i've replaced the JFET and added two 4148 protecting diodes on >> the gate against ground and plus. >> Reception looks much better now: >> 0...24kHz: >> https://dl.dropboxusercontent.com/u/19882028/VLF/wide_500msperdiv_732mHzFFT_garden3rd.png >> 0...4 kHz: >> https://dl.dropboxusercontent.com/u/19882028/VLF/0...4kHz_500msperdiv_732mHzFFT_garden3rd.png >> 0...500 Hz: >> https://dl.dropboxusercontent.com/u/19882028/VLF/0...500Hz_500msperdiv_732mHzFFT_garden3rd.png >> ZEVS in 7.6 mHz, 40 sec scroll rate: >> https://dl.dropboxusercontent.com/u/19882028/VLF/ZEVS_1st.png >> >> It looks like i need some more gain on the lower frequencies. Will >> modify the circuit a bit... >> >> 73, Stefan/DK7FC > --------------020803070406030909030406 Content-Type: text/html; charset=ISO-8859-15 Content-Transfer-Encoding: 8bit Thanks Wolf,

Yes, a good idea. I will try to catch it :-) But how do i know that it is the US mains instead of a 60 Hz monitor? Is the 60 Hz from the mains more stable?
I will work on the circuit and continue tomorrow.
Also i am curious about experiments near 2 kHz, now that i have a relatively clean RX site. I think about grounding the far end of my inv-L and run some 10A near 2 kHz. This vertical loop would have about 2100 m^2 beaming N/S. A RX loop could show some variation of the SNR due to the earth/ionosphere resonator...

73, Stefan


Am 03.10.2014 22:14, schrieb wolf_dl4yhf:
Hi Stefan,

The 82 Hz signal looks good... you may even catch a glimpse of "DX" from the US and their 60 Hz mains with that setup.
It's several dB down on ZEVS but sometimes good copy here, on an active E-field probe out in the woods (far away from old PC monitors which sometimes operated near 60 Hz).

73,
  Wolf  DL4YHF .

Am 03.10.2014 21:38, schrieb Stefan Schäfer:
Hi VLF,

This evening i received ZEVS for the first time in the garden :-)

I used nearly the same circuit than in my email below. However, i found that the J310 was damaged! Remembers me on the old discussion if protecting diodes are necessary or not :-) But this is a large antenna, compared to an active E probe like the PA0RDT-antenna...
Now i've replaced the JFET and added two 4148 protecting diodes on the gate against ground and plus.
Reception looks much better now:
0...24kHz: https://dl.dropboxusercontent.com/u/19882028/VLF/wide_500msperdiv_732mHzFFT_garden3rd.png
0...4 kHz: https://dl.dropboxusercontent.com/u/19882028/VLF/0...4kHz_500msperdiv_732mHzFFT_garden3rd.png
0...500 Hz: https://dl.dropboxusercontent.com/u/19882028/VLF/0...500Hz_500msperdiv_732mHzFFT_garden3rd.png
ZEVS in 7.6 mHz, 40 sec scroll rate: https://dl.dropboxusercontent.com/u/19882028/VLF/ZEVS_1st.png

It looks like i need some more gain on the lower frequencies. Will modify the circuit a bit...

73, Stefan/DK7FC

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