Return-Path: Received: from mtain-mc01.r1000.mx.aol.com (mtain-mc01.r1000.mx.aol.com [172.29.96.73]) by air-dc09.mail.aol.com (v129.4) with ESMTP id MAILINDC091-86054d7beb213de; Sat, 12 Mar 2011 16:52:33 -0500 Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-mc01.r1000.mx.aol.com (Internet Inbound) with ESMTP id A99F53800008B; Sat, 12 Mar 2011 16:52:31 -0500 (EST) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1PyWix-00085z-Dt for rs_out_1@blacksheep.org; Sat, 12 Mar 2011 21:51:47 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1PyWiw-00085q-TF for rsgb_lf_group@blacksheep.org; Sat, 12 Mar 2011 21:51:46 +0000 Received: from cavuit02.kulnet.kuleuven.be ([134.58.240.44]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1PyWiu-0007JR-7X for rsgb_lf_group@blacksheep.org; Sat, 12 Mar 2011 21:51:46 +0000 Received: from smtps01.kuleuven.be (smtpshost01.kulnet.kuleuven.be [134.58.240.74]) by cavuit02.kulnet.kuleuven.be (Postfix) with ESMTP id C9FB551C001 for ; Sat, 12 Mar 2011 22:51:36 +0100 (CET) Received: from ICTS-S-HUB-N1.luna.kuleuven.be (icts-s-hub-n1.luna.kuleuven.be [10.112.9.11]) by smtps01.kuleuven.be (Postfix) with ESMTP id CDFFB31E702 for ; Sat, 12 Mar 2011 22:51:36 +0100 (CET) Received: from ICTS-S-EXC2-CA.luna.kuleuven.be ([10.112.11.13]) by ICTS-S-HUB-N1.luna.kuleuven.be ([10.112.9.11]) with mapi; Sat, 12 Mar 2011 22:51:36 +0100 X-Kuleuven: This mail passed the K.U.Leuven mailcluster From: Rik Strobbe To: "rsgb_lf_group@blacksheep.org" Date: Sat, 12 Mar 2011 22:48:22 +0100 Thread-Topic: LF: DK7FC on 137715 Thread-Index: Acvg+aJuI07yaWkjTQmZCAMloVH3twABZLsX Message-ID: References: <20213.4bee0777.3aad274e@aol.com>,<4D7BE035.2050107@iup.uni-heidelberg.de> In-Reply-To: <4D7BE035.2050107@iup.uni-heidelberg.de> Accept-Language: nl-NL, nl-BE Content-Language: nl-BE X-MS-Has-Attach: X-MS-TNEF-Correlator: acceptlanguage: nl-NL, nl-BE MIME-Version: 1.0 X-KULeuven-Information: Katholieke Universiteit Leuven X-KULeuven-Scanned: Found to be clean X-KULeuven-Envelope-From: rik.strobbe@fys.kuleuven.be X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,HTML_MESSAGE=0.001 Subject: RE: LF: DK7FC on 137715 Content-Type: multipart/alternative; boundary="_000_BF4A524700075746A6467658DFC7102C88B2129D15ICTSSEXC2CAlu_" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.5 required=5.0 tests=HTML_20_30,HTML_MESSAGE, TO_ADDRESS_EQ_REAL 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 x-aol-global-disposition: G x-aol-sid: 3039ac1d60494d7beb1f3246 X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none X-Mailer: Unknown (No Version) --_000_BF4A524700075746A6467658DFC7102C88B2129D15ICTSSEXC2CAlu_ Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Hello Stefan, good audible signal here with my 500kHz antenna. Only 10 Ohm loss is a dream, I never managed to get losses below 100 Ohm= on 137kHz. Running a "decent power" into that antenna should give you a good signal= all over Europe (and maybe beyond). 73, Rik ON7YD - OR7T ________________________________ Van: owner-rsgb_lf_group@blacksheep.org [owner-rsgb_lf_group@blacksheep.or= g] namens Stefan Sch=E4fer [schaefer@iup.uni-heidelberg.de] Verzonden: zaterdag 12 maart 2011 22:05 Aan: rsgb_lf_group@blacksheep.org Onderwerp: Re: LF: DK7FC on 137715 Thank you Nicolas, Tony and Markus! Yes, today i have resonated my new "office antenna" with a suitable coil. Some data about the system: Wire about 90 long and 25m (average) up. The overall losses seem to be 10= Ohm although the coil is just out of 0.75 sq mm loudspeaker cable. The sy= stem is exactly resonated and matched to 50 Ohm. So i get 2 A antenna curr= ent at about 40 W :-) Markus dis some field strength measurements and we estimated an antenna ef= ficiency of about 1%. The todays tests and QSOs were done with 40 W TX power out of a 12V class= E PA. It is all a very loose construction in the shack, just for testing. I will= make a better coil. Currently i am using my DDS VFO at 137.715 kHz with= a DFCW shift of 1 Hz. I can remote control the whole TX! So i do not have to stay all the time= in the institute but can do QSOs from anywhere where i find a internet co= nnection :-) I just can't change the frequency but i am working on a TX co= nverter and then use SpecLab for TXing. Currently i am using Rik's QRS pro= gramm which works excellent! The resonated antenna is lifting the grabber RX signal by 20 dB without af= fecting the SNR as it seems. I will check if the TX antenna is rather suit= able as a RX antenna as well. Currently i can see S57A answering on my call. I can see it on OE3GHBs gra= bber but not on mine :-( Hopefully conds will become better in the late ev= ening... Tnx to DF6NM for the first and HB9ASB for the second QSO on this antenna!= HB9ASB is my first contact on 137 kHz in HB9, mni tnx!! :-) 73, Stefan/DK7FC PS: Now you are all on VLF and i am coming back to LF. Isn't it funny? :-) Am 12.03.2011 20:45, schrieb F4DTL@aol.com: Nice signal here Stefan... F4DTL Nicolas JN18FP RX : Icom IC7400 Ant: Wellbrook LFL 1010 http://lfistes.erst.azerttyu.net/ --_000_BF4A524700075746A6467658DFC7102C88B2129D15ICTSSEXC2CAlu_ Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Hello Stefan,
 
good audible signal here w= ith my 500kHz antenna.
Only 10 Ohm loss is a dream, I never= managed to get losses below 100 Ohm on 137kHz.
Running a "decent power"= into that antenna should give you a good signal all over Europe (and mayb= e beyond).
 
73, Rik  ON7YD - OR7T
 
Van: owner-rsgb_= lf_group@blacksheep.org [owner-rsgb_lf_group@blacksheep.org] namens Stefan= Sch=E4fer [schaefer@iup.uni-heidelberg.de]
Verzonden: zaterdag 12 maart 2011 22:05
Aan: rsgb_lf_group@blacksheep.org
Onderwerp: Re: LF: DK7FC on 137715

Thank you Nicolas, Tony and Markus!

Yes, today i have resonated my new "office antenna" with a suita= ble coil.

Some data about the system:

Wire about 90 long and 25m (average) up. The overall losses seem to be 10= Ohm although the coil is just out of 0.75 sq mm loudspeaker cable. The sy= stem is exactly resonated and matched to 50 Ohm. So i get 2 A antenna curr= ent at about 40 W :-)
Markus dis some field strength measurements and we estimated an antenna ef= ficiency of about 1%.

The todays tests and QSOs were done with 40 W TX power out of a 12V class= E PA.

It is all a very loose construction in the shack, just for testing. I will= make a better coil. Currently i am using my DDS VFO at 137.715 kHz with= a DFCW shift of 1 Hz.

I can remote control the whole TX! So i do not have to stay all the time= in the institute but can do QSOs from anywhere where i find a internet co= nnection :-) I just can't change the frequency but i am working on a TX co= nverter and then use SpecLab for TXing. Currently i am using Rik's QRS programm which works excellent!

The resonated antenna is lifting the grabber RX signal by 20 dB without af= fecting the SNR as it seems. I will check if the TX antenna is rather suit= able as a RX antenna as well.

Currently i can see S57A answering on my call. I can see it on OE3GHBs gra= bber but not on mine :-( Hopefully conds will become better in the late ev= ening...

Tnx to DF6NM for the first and HB9ASB for the second QSO on this antenna!= HB9ASB is my first contact on 137 kHz in HB9, mni tnx!! :-)

73, Stefan/DK7FC

PS: Now you are all on VLF and i am coming back to LF. Isn't it funny? :-)=



Am 12.03.2011 20:45, schrieb F4DTL@aol.com:
Nice signal here Stefan...
 
F4DTL Nicolas JN18FP RX : Icom IC7400
Ant: Wellbrook LFL 1010

http://lfi= stes.erst.azerttyu.net/
--_000_BF4A524700075746A6467658DFC7102C88B2129D15ICTSSEXC2CAlu_--