Return-Path: Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by klubnl.pl (8.14.4/8.14.4/Debian-8+deb8u2) with ESMTP id w06IQQqx014240 for ; Sat, 6 Jan 2018 19:26:28 +0100 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1eXt54-000469-Ex for rs_out_1@blacksheep.org; Sat, 06 Jan 2018 18:20:30 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1eXt53-000460-L1 for rsgb_lf_group@blacksheep.org; Sat, 06 Jan 2018 18:20:29 +0000 Received: from smtp-out-no.shaw.ca ([64.59.134.12]) by relay1.thorcom.net with esmtps (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.89) (envelope-from ) id 1eXt4z-0002Jw-Qi for rsgb_lf_group@blacksheep.org; Sat, 06 Jan 2018 18:20:28 +0000 Received: from cds110.dcs.int.inet ([10.0.153.158]) by shaw.ca with ESMTP id Xt4geCSjOYy1iXt4heapaI; Sat, 06 Jan 2018 11:20:08 -0700 X-DKIM-Result: Domain=shaw.ca Result=Signature OK DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=shaw.ca; s=s20150330; t=1515262808; bh=FrE4qlDqFMS6O8D83PxtNyEImnl2UbfJjkpdp6FRqLs=; h=Date:From:To:In-Reply-To:References:Subject; b=YWY7eNRM1RmePTFzRa6dIez51KwRLtO1pkN1xLDF+SqGjRl6troHqIKpomG6EHhAM k2r3KwHX+bLycQe2f9Y0TwgoeRfEsPlUCOFzdi6jwKW+zVJ5MBRVSWT1kQb3vqurcX fa0C3ZKVC3T2uvxg4TXjz3JcKL6akmlV2Et+eUsgCwjY1mfvvg0ppF3QdOFq3MDmeD fEUnwTQIQm8BMhbDv8AnP2ay/PLQC2Dczfm5t3ipgD/FHKR7YBb71Y+mwNU1EmoAxS XfC9qlzCX7hudwFSXwg/yW8VBw2+sQF9Fko6K2qCiH7SIOWxCQXA+VQQiQRlAdSXZt XbTvuajOgdi8Q== X-Authority-Analysis: v=2.2 cv=f8g4PK6M c=1 sm=1 tr=0 a=waJNmSTfdSAeIyX21TZnUA==:117 a=FKkrIqjQGGEA:10 a=d_JjZ9m1VnQA:10 a=x7bEGLp0ZPQA:10 a=gALWx8SoAAAA:8 a=F3M5lZpKAAAA:8 a=H3egs_fBkDYcCk-2SsYA:9 a=QEXdDO2ut3YA:10 a=BBn4G7cjvL4wYqDwuYIA:9 a=Jtw-uN3lLdNm0Y8V:21 a=_W_S_7VecoQA:10 a=NimQcH1vBxjHXADWa3Zj:22 a=slCku8JSH3TyizEDQ3pD:22 Date: Sat, 6 Jan 2018 11:20:06 -0700 (MST) From: JACK ASKEW To: rsgb lf group Message-ID: <1178238001.101520499.1515262806879.JavaMail.zimbra@shaw.ca> In-Reply-To: References: <4d96a9d4-5f22-7650-872b-6344e9aea8e3@abelian.org> <702563436.93043973.1515019639560.JavaMail.zimbra@shaw.ca> <1117988114.95527491.1515092735528.JavaMail.zimbra@shaw.ca> <1944603203.95803107.1515098735558.JavaMail.zimbra@shaw.ca> MIME-Version: 1.0 X-Originating-IP: [96.54.64.165, 96.54.64.165] X-Mailer: Zimbra 8.6.0_GA_1200 (ZimbraWebClient - FF57 (Win)/8.6.0_GA_1200) Thread-Topic: Todmorden receiver Thread-Index: M7CZyVArJnaQ5pCILihsag9PTZBaTA== X-CMAE-Envelope: MS4wfIwzZ18Yk/YtAQLNfpVN00R1Q5zjjfpGYkcH5256Etaf9zNsamyC24bCpFZTrTpe4NNM4dU8DTM/t4fII+Qf8q8/txcaq15jH1OsWMDGFtzZdBZB2/8X ldi0MAcHzMT30AhMj5OlchhzBZi1u6Lc1y/q4/W/UDR611EJDMo1r2tTbp2cN/NojAOw7yyXOMm2rg== X-Spam-Score: 0.0 (/) X-Spam-Report: Spam detection software, running on the system "relay1.thorcom.net", has NOT identified this incoming email as spam. The original message has been attached to this so you can view it or label similar future email. If you have any questions, see the administrator of that system for details. Content preview: Paul You are still very young in comparison to me :-) I agree I tend to spend more time going into depth learning about new technology these days. EbNaut is one good example, very complex system to learn for me but I find fascinating. I hope some day someone writes a basic book on how to get started with using it. Maybe it will encourage more to get on VLF using this method. I'm caught between building hardware or using software with a sound card etc. If I go with hardware I'm unclear how you could record the data and view several hours of it later. It comes back to using something like SL with its QRSS capabilities. I wish I had a good file that worked at 8720kHz for QRSS600 as an example. This would be a good start if nothing else. [...] Content analysis details: (0.0 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- -0.0 T_RP_MATCHES_RCVD Envelope sender domain matches handover relay domain 0.0 HTML_MESSAGE BODY: HTML included in message 0.0 T_DKIM_INVALID DKIM-Signature header exists but is not valid X-Scan-Signature: 41a44ec7f64a884bcdc566aa8432178a Subject: Re: LF: RE: Todmorden receiver Content-Type: multipart/alternative; boundary="----=_Part_101520498_1647598830.1515262806878" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: * X-Spam-Status: No, hits=1.1 required=5.0 tests=HTML_MESSAGE, MAILTO_TO_SPAM_ADDR autolearn=no version=2.63 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 ------=_Part_101520498_1647598830.1515262806878 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit Paul You are still very young in comparison to me :-) I agree I tend to spend more time going into depth learning about new technology these days. EbNaut is one good example, very complex system to learn for me but I find fascinating. I hope some day someone writes a basic book on how to get started with using it. Maybe it will encourage more to get on VLF using this method. I'm caught between building hardware or using software with a sound card etc. If I go with hardware I'm unclear how you could record the data and view several hours of it later. It comes back to using something like SL with its QRSS capabilities. I wish I had a good file that worked at 8720kHz for QRSS600 as an example. This would be a good start if nothing else. Jack Askew From: "Paul Nicholson" To: "rsgb lf group" Sent: Friday, January 5, 2018 11:33:51 PM Subject: Re: LF: RE: Todmorden receiver Receivers will be off at various times today to install that power supply upgrade and replace some random cabling with something a bit more robust. http://abelian.org/vlf/tmp/180106a.jpg The box on the left terminates the cat5 cables coming in from the E and H rx sites. It's a junction box with isolating transformers and on/off switches for each rx. It has three balanced VLF outputs and a three-channel 137kHz output. The other box is a dual 55V PSU. Nominally 48V but adjusted up to the max. I didn't want to have both rx share the same supply, hence two of everything. Decided to use a bit of extra ripple smoothing and RF filtering to make the DC bus really clean. Each rx will have to come in for replacement DC-DC converter. Then everything needs recalibrating which takes only about 2 hours now for both rx. I just hope the weather holds good. All my radio equipment and the computers that go with it, lives outside the house in a small shed. One plug isolates the shed during thunderstorms. As well as protecting the house from fires and lightning, it seems much easier to manage and limit noise and interference that way and there is much less cabling. Jack wrote: > But when you get to be 75 years old ones ability to absorb > technical complex issues gets more problematic ;-) I hope not - I'm catching you up fast. Only yesterday I was in my 30s, and a couple of days before that, my 20s! No, I don't believe that Jack. I think that when you're older it seems to take longer, perhaps because you go into things in more depth with more understanding. The youngsters just learn which buttons to push. Andy reminds us that there are other ways to receive coherent signals... my knowledge is limited to sound cards and PC software. I envy those that can build things out of PICs and DSP chips. -- Paul Nicholson -- ------=_Part_101520498_1647598830.1515262806878 Content-Type: text/html; charset=utf-8 Content-Transfer-Encoding: quoted-printable
Paul

You are still very young in comparison to me :-)   I = agree
I tend to spend more time going into depth learning abo= ut new
technology these days. EbNaut is one good example, very&n= bsp;
complex system to learn for me but I find fascinating. =
I hope some day someone writes a basic book on how to get
started with using it. Maybe it will encourage= more to get on
VLF using this method.<= br data-mce-bogus=3D"1">
I'm caught between building hardware or = using software with
a sound card etc. If I go with hardware I'm u= nclear how you
could record the data an= d view several hours of it later.
It comes back to using somethin= g like SL with its QRSS
capabilities. I = wish I had a good file that worked at 8720kHz
for QRSS600 as an = example. This would be a good start if nothing else.

Jack Askew

From: "Paul Nicholson" = <vlf0403@abelian.org>
To: "rsgb lf group" <rsgb_lf_group= @blacksheep.org>
Sent: Friday, January 5, 2018 11:33:51 PM
= Subject: Re: LF: RE: Todmorden receiver

Receivers will be off at various times today to insta= ll that
power supply upgrade and replace some random cabling with
som= ething a bit more robust.

  http://abelian.org/vlf/tmp/180= 106a.jpg

The box on the left terminates the cat5 cables coming in fr= om
the E and H rx sites.  It's a junction box with isolating
tra= nsformers and on/off switches for each rx.  It has three
balanced V= LF outputs and a three-channel 137kHz output.

The other box is a dua= l 55V PSU.  Nominally 48V but adjusted
up to the max. I didn't want= to have both rx share the same
supply, hence two of everything.  D= ecided to use a bit of
extra ripple smoothing and RF filtering to make t= he DC bus
really clean.

Each rx will have to come in for replacem= ent DC-DC converter.
Then everything needs recalibrating which takes onl= y about 2
hours now for both rx.   I just hope the weather holds go= od.

All my radio equipment and the computers that go with it, lives<= br>outside the house in a small shed.  One plug isolates the shed
d= uring thunderstorms.  As well as protecting the house from
fires an= d lightning, it seems much easier to manage and limit
noise and interfer= ence that way and there is much less cabling.

Jack wrote:

&nb= sp;> But when you get to be 75 years old ones ability to absorb
 = ;> technical complex issues gets more problematic ;-)

I hope not = - I'm catching you up fast.  Only yesterday I was
in my 30s, and a = couple of days before that, my 20s!

No, I don't believe that Jack. &= nbsp;I think that when you're older
it seems to take longer, perhaps bec= ause you go into things in
more depth with more understanding.  The= youngsters just
learn which buttons to push.

Andy reminds us tha= t there are other ways to receive coherent
signals...  my knowledge= is limited to sound cards and PC
software.  I envy those that can = build things out of PICs and
DSP chips.

--
Paul Nicholson
-= -
------=_Part_101520498_1647598830.1515262806878--