Return-Path: X-Spam-DCC: paranoid 1170; Body=3 Fuz1=3 Fuz2=2 X-Spam-Checker-Version: SpamAssassin 3.1.3 (2006-06-01) on lipkowski.org X-Spam-Level: X-Spam-Status: No, score=-2.4 required=5.0 tests=BAYES_00,DNS_FROM_AHBL_RHSBL, HTML_MESSAGE,SPF_PASS,UNPARSEABLE_RELAY autolearn=no version=3.1.3 Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by paranoid.lipkowski.org (8.13.7/8.13.7) with ESMTP id u8SLPtX4005957 for ; Wed, 28 Sep 2016 23:25:55 +0200 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1bpMIm-000184-4N for rs_out_1@blacksheep.org; Wed, 28 Sep 2016 22:22:04 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1bpMIg-00017v-7M for rsgb_lf_group@blacksheep.org; Wed, 28 Sep 2016 22:21:58 +0100 Received: from omr-m012e.mx.aol.com ([204.29.186.12]) by relay1.thorcom.net with esmtps (TLSv1:DHE-RSA-AES256-SHA:256) (Exim 4.87) (envelope-from ) id 1bpMId-0003QV-FO for rsgb_lf_group@blacksheep.org; Wed, 28 Sep 2016 22:21:56 +0100 Received: from mtaomg-aag02.mx.aol.com (mtaomg-aag02.mx.aol.com [172.26.126.80]) by omr-m012e.mx.aol.com (Outbound Mail Relay) with ESMTP id 9E3E838000B1 for ; Wed, 28 Sep 2016 17:21:51 -0400 (EDT) Received: from core-acc02f.mail.aol.com (core-acc02.mail.aol.com [172.26.125.12]) by mtaomg-aag02.mx.aol.com (OMAG/Core Interface) with ESMTP id 10E3538000219 for ; Wed, 28 Sep 2016 17:21:51 -0400 (EDT) Received: from 188.192.95.60 by webprd-m58.mail.aol.com (10.74.51.137) with HTTP (WebMailUI); Wed, 28 Sep 2016 17:21:50 -0400 Date: Wed, 28 Sep 2016 17:21:50 -0400 From: Markus Vester To: rsgb_lf_group@blacksheep.org Message-Id: <15772acd0cf-3311-273e@webprd-m58.mail.aol.com> In-Reply-To: <1544518546.20160928191058@mterrier.net> MIME-Version: 1.0 X-MB-Message-Source: WebUI X-MB-Message-Type: User X-Mailer: JAS STD X-Originating-IP: [188.192.95.60] x-aol-global-disposition: G DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=mx.aol.com; s=20150623; t=1475097711; bh=6YnJX3HWNlhxPx9MkFKOWNRKDeysNZ1+E10qKkjhZ9I=; h=From:To:Subject:Message-Id:Date:MIME-Version:Content-Type; b=X4LkM0PNJtuoQ/6AD3kEeMoHjxekewmGJy+H1TJWkLjCtIyyd2N7Di7FmOm0fwRg+ lNPREvwThZkkZH8WVcIVL0NBl+Rq+8PGDFJpc7cGRpri1Kgrk3yPIdiJz1o4VRQNgb O480zy3LfM8KiknEIhinhtNHtKGF7zTrcJr0CMeQ= x-aol-sid: 3039ac1a7e5057ec346f305c X-Scan-Signature: 08189ecf0514bcba2be8490569e8d13c Subject: Re: LF: F5WK EbNaut Content-Type: multipart/alternative; boundary="----=_Part_13021_626687638.1475097710797" 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 10.1.3.11 Status: O X-Status: X-Keywords: X-UID: 8870 ------=_Part_13021_626687638.1475097710797 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Hi Michel, your signal is not weak at all, surely good enough for comfortable QRSS3 re= ading here.=20 Regarding overcurrent trip: I found that for safest operation of a class-D = PA, the antenna impedance should be presented as a series resonant circuit = to the transistors, because that will have high impedance for any out-of-re= sonance spectral components. Then during phase reversals, the current will = experience a dip rather than a peak. The impedance condition depends on the= total phase shift of the matching circuits and low pass filters, which sho= uld ideally be 0 or 180=C2=B0. However feeding into a 50-ohm loading coil t= ap (or through certain PI- or T-filters) tends to have around 90=C2=B0, tra= nsforming series resonance into parallel resonance, and presenting a short-= circuit to the PA for out-of-band exciation. Tonight there seems to be a (somewhat weaker) trace on your QRG again, are = you still sending EbNaut? Best 73, Markus (DF6NM) -----Urspr=C3=BCngliche Mitteilung-----=20 Von: Michel Brunel An: Domenico IZ7SLZ Verschickt: Mi, 28 Sept 2016 7:13 pm Betreff: Re: LF: F5WK EbNaut Hi, Big thanks to Domenico, Markus and Stefan for their successful decoding of= my EbNaut transmissions. Ebnaut decoding is not an easy task especially with weak signal. I fear my GPSDO frequency was not as accurate than expected. I had the bad= idea to use a low cost GPS antenna wich performed not as good as the professional grade antenna I used for tests at home. Th= us some jitter and phase jumps depending on GPS constellation position. As a "proof of concept" I made Loran-C records during the day using the e= bnaut setup and results are sometime good sometime not so good. The transmitter overcurrent was randomly triggered by the phase reversal.= Bpsk modulation is performed synchronously by exclusive OR gates, between = the D flip-flop and the MOS drivers. Phase reversal is like changing the fr= equency for a very short time, which leads to a current pike due to the hig= h Q of the LF antenna. Decision was taken to bypass the overcurrent detecti= on. The good way to do bpsk modulation is with a suitable DDS such as AD9852.= =20 I found the antenna performs poorly at LF since the radials are burried in= a sandy soil, as time goes on. No big deal for ebnaut though. A lot of things to improve for my next LF campaign,=20 73, Michel - f5wk/P=20 -----Urspr=C3=BCngliche Mitteilung-----=20 Von: DK7FC An: rsgb_lf_group Verschickt: Mi, 28 Sept 2016 2:42 pm Betreff: Re: LF: F5WK EbNaut Hi LF,=20 I tried the 20 UTC transmission (didn't thry the others) and got a nice de= code, see attachment. Congrats to the successful transmission. I will join in too in some time :-= ) 73, Stefan Von: Markus Vester An: rsgb_lf_group Verschickt: Mi, 28 Sept 2016 12:33 pm Betreff: Re: LF: F5WK EbNaut Also very nice decodes here:=20 2016-09-27 "F5WK IN99EF" start Eb/N0 (db) UT symbol carrier=20 16:15:01 8.5 17.4 (aborted after 9 min) 16:45:01 71.1 22.2 17:00:01 17.7 20.3 17:30:01 17.7 21.3 18:00:01 nil (aborted after 2 min) 18:30:01 17.7 21.7 19:00:01 71.1 21.4 19:30:01 17.7 23.1 20:00:01 17.7 23 20:30:02 71.1 23.9 (1 sec later) 21:00:01 10.4 14.1 21:30:01 16.7 20.7 22:00:01 14.7 15.8 Michel's transmissions are also well visible as blue dashes in the daily gr= abber archive: http://df6nm.bplaced.net/LF/archive/2016/20160927.jpg http://df6nm.bplaced.net/LF/archive/2016/20160926.jpg Best 73, Markus (DF6NM) Le mercredi 28 septembre 2016 =C3=A0 11:08:55, Domenico =C3=A9crivait : Hello LF, EbNaut test signals from Michel F5WK/P in Normandy has been received also= here in JN80NU (QRB =3D 1700 km). This is the list of my decodes: DATE TIME UT Time OFFSET [s] EbN0[dB] Carrier E= bN0[dB] Rk 26-09-2016 21:30 0 0.9 = 1.9 0 =20 message:F5WK JN18HP ---------------------------------------------------------------------------= --------------------------------------------------- 27-09-2016 18:30 1 5.6 = 6.7 0 =20 27-09-2016 19:00 1 7.8 = 9.0 0 =20 27-09-2016 19:30 1 5.1 = 5.8 0 =20 27-09-2016 20:00 1 6.1 = 6.7 0 =20 27-09-2016 20:30 1 6.5 = 6.7 0 =20 27-09-2016 21:00 1 NIL 27-09-2016 21:30 1 3.7 = 4.6 0 =20 27-09-2016 22:00 1 3.0 = 4.4 0 =20 message: F5WK IN99EF receiver in use: JRC NCR-92M with 10 MHz GPDO with 7m passive whip antenna. Congratulation Michel for your EbNaut nice going; can you describe your set= up ? 73, Domenico IZ7SLZ On 27 September 2016 at 00:22, Markus Vester wrote: Michel F5WK is running EbNaut tonight! He's got a strong and stable Signal,= and the 21 UT sequence produced a successful decode here. Thanks to Michel for the test transmissions, and to Domenico IZ7SLZ for ki= ndly passing on the Information. Best 73, Markus (DF6NM) ---------- Forwarded message ---------- From: "Michel Brunel" Date: 26 Sep 2016 18:41 Subject: Re: Need some help ! To: "Domenico IZ7SLZ" Cc:=20 Hi Domenico, I'm now ready to transmit an ebnaut test at UTC 18:00:00 - 137489.999179 Hz - message length 11 - Coding 8K19A - symbol period 1.0 - duration 13:20:00 Estimated ERP: 100 mW=20 Michel - f5wk/P -- ------=_Part_13021_626687638.1475097710797 Content-Type: text/html; charset=utf-8 Content-Transfer-Encoding: quoted-printable
Hi Michel,

your signal is not weak a= t all, surely good enough for comfortable QRSS3 reading here. 

= Regarding overcurrent trip: I found that for safest operation of = a class-D PA, the antenna impedance should be presented as a seri= es resonant circuit to the transistors, because that will have high impedan= ce for any out-of-resonance spectral components. Then during phase rev= ersals, the current will experience a dip rather than a peak. The impedance=  condition depends on the total phase shift of the matching circuits a= nd low pass filters, which should ideally be 0 or 180=C2=B0. However feedin= g into a 50-ohm loading coil tap (or through certain PI- or T-filters) tend= s to have around 90=C2=B0, transforming series resonance into parallel= resonance, and presenting a short-circuit to the PA for out-of-band exciat= ion.

Tonight there seems to be a (somewhat weaker) trace o= n your QRG again, are you still sending EbNaut?

Best 73,
Markus&n= bsp;(DF6NM)



-----Ursp= r=C3=BCngliche Mitteilung-----
Von: Michel Brunel <f5wk= @mterrier.net>
An: Domenico IZ7SLZ <rsgb_lf_group@bla= cksheep.org>
Verschickt: Mi, 28 Sept 2016 7:13 pm
Betreff: Re: LF: F5WK EbNaut

Hi,
Big thanks to Domenico, Markus and Stefan for their successful decoding of = my EbNaut transmissions.
Ebnaut decoding is not an easy task especially with weak signal.

I fear my GPSDO frequency was not as accurate than expected. I had the bad = idea to use a low cost GPS antenna wich performed
not as good as the professional grade antenna I used for tests at home. Thu= s some jitter and phase jumps depending on GPS constellation position.
As a "proof of concept" I made Loran-C records during the day  using t= he ebnaut setup and results are sometime  good sometime not so good.
The transmitter overcurrent was randomly  triggered by the phase rever= sal. Bpsk modulation is performed synchronously by exclusive OR gates, betw= een the D flip-flop and the MOS drivers. Phase reversal is like changing th= e frequency for a very short time, which leads to a current pike due to the= high Q of the LF antenna. Decision was taken to bypass the overcurrent det= ection.
The good way to do bpsk modulation is with a suitable DDS such as AD9852.&n= bsp;

I found the antenna performs poorly at LF since the radials are burried in = a sandy soil, as time goes on. No big deal for ebnaut though.

A lot of things to improve for my next LF campaign, 

73,
Michel - f5wk/P 

-----Urspr=C3=BCngliche Mitteilung----- Von: DK7FC <selberdenken@posteo.de>
An: rsgb_lf_grou= p <rsgb_lf_group@blacksheep.org>
Verschickt: Mi, 28 S= ept 2016 2:42 pm
Betreff: Re: LF: F5WK EbNaut

Hi LF,

I tried the 2= 0 UTC transmission (didn't thry the others) and got a nice decode, see atta= chment.
Congrats to the successful transmission. I will jo= in in too in some time :-)

73, Stefan

Von: Markus Vester <markusvester@aol.com&g= t;
An: rsgb_lf_group <rsgb_lf_group@blacksheep.org>Verschickt: Mi, 28 Sept 2016 12:33 pm
Betref= f: Re: LF: F5WK EbNaut

Also very nice decodes he= re:

2016-09-27  "F5WK IN99EF"

start    &nb= sp;    Eb/N0 (db)
 UT &n= bsp;     symbol carrier 
=
16:15:01   8.5   17.4 (aborted after 9= min)
16:45:01  71.1   22.2
= 17:00:01  17.7   20.3
17:30:01  17.7&nb= sp;  21.3
18:00:01      nil&n= bsp;        (aborted after 2 min)
18:30:01  17.7   21.7
19:00:01&nbs= p; 71.1   21.4
19:30:01  17.7   23= .1
20:00:01  17.7   23
20:30= :02  71.1   23.9 (1 sec later)
21:00:01 = ; 10.4   14.1
21:30:01  16.7   20.= 7
22:00:01  14.7   15.8

Michel's transmissions are also well visible as = blue dashes in the daily grabber archive:
http://df6nm.bplaced.net/LF/archive/2016/20160927.jpg
http://df6nm.bplaced.net/LF/archive/2016/20160926= .jpg

Best 73,
Markus (DF6NM)



Le mercredi 28 septembre 2016 =C3=A0 11:08:55, Domenico =C3=A9crivait :
 

 Hello LF,

EbNaut test signals from Michel F5WK/P in Normandy  has been received = also here in JN80NU (QRB =3D 1700 km).
This is the list of my decodes:

DATE           TIME UT   &nbs= p; Time OFFSET [s]       EbN0[dB]        = ; Carrier EbN0[dB]     Rk
26-09-2016     21:30            = ; 0                     &= nbsp;       0.9             &n= bsp;          1.9         &nbs= p;       0     
 message:F5WK JN18HP
-----------------------------------------------------------------------= -------------------------------------------------------
27-09-2016     18:30             1 =                      = ;      5.6               =           6.7           &= nbsp;     0  
27-09-2016     19:00             1 =                      = ;      7.8               =           9.0           &= nbsp;     0     
27-09-2016     19:30             1 =                      = ;      5.1               =           5.8           &= nbsp;     0  
27-09-2016     20:00             1 =                      = ;      6.1               =           6.7           &= nbsp;     0  
27-09-2016     20:30             1 =                      = ;      6.5               =           6.7           &= nbsp;     0  
27-09-2016     21:00             1 =                      = ;     NIL
27-09-2016     21:30             1 =                      = ;      3.7               =           4.6           &= nbsp;     0  
27-09-2016     22:00             1 =                      = ;      3.0               =           4.4           &= nbsp;     0  
 message: F5WK IN99EF

receiver in use: JRC NCR-92M with 10 MHz GPDO with 7m passive whip ante= nna.

Congratulation Michel for your EbNaut nice going; can you describe your= setup ?
73, Domenico IZ7SLZ





On 27 September 2016 at 00:22, Markus Vester <markusvester@aol.com> wrote:
Michel = F5WK is running EbNaut tonight! He's got a strong and stable Signal, and th= e 21 UT sequence produced a successful decode here.

Thanks to Michel for the test transmissions, and to Domenico IZ7SLZ for kin= dly passing on the Information.

Best 73,
Markus (DF6NM)

---------- Forwarded message ----------
From: "Michel Brunel" <f5wk@mterrier.net>
Date: 26 Sep 2016 18:41
Subject: Re: Need some help !
To: "Domenico IZ7SLZ" <iz7slz.domenico@gmail.com>
Cc: 

Hi  Domenico,

I'm now ready to transmit an ebnaut test at UTC 18:00:00
- 137489.999179 Hz
- message length 11
- Coding  8K19A
- symbol period 1.0
- duration  13:20:00

Estimated ERP: 100 mW 

Michel - f5wk/P




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