Return-Path: Received: from rly-da05.mx.aol.com (rly-da05.mail.aol.com [172.19.129.79]) by air-da05.mail.aol.com (v121.4) with ESMTP id MAILINDA052-a6e476fd2702fd; Mon, 24 Dec 2007 10:38:37 -0500 Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by rly-da05.mx.aol.com (v121.4) with ESMTP id MAILRELAYINDA056-a6e476fd2702fd; Mon, 24 Dec 2007 10:38:26 -0500 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1J6pNj-0005Ai-7E for rs_out_1@blacksheep.org; Mon, 24 Dec 2007 15:38:19 +0000 Received: from [193.82.116.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1J6pNi-0005AZ-Hn for rsgb_lf_group@blacksheep.org; Mon, 24 Dec 2007 15:38:18 +0000 Received: from qmta10.westchester.pa.mail.comcast.net ([76.96.62.17]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1J6pNe-0007Cx-Ub for rsgb_lf_group@blacksheep.org; Mon, 24 Dec 2007 15:38:18 +0000 Received: from OMTA04.westchester.pa.mail.comcast.net ([76.96.62.35]) by QMTA10.westchester.pa.mail.comcast.net with comcast id UdZF1Y00T0ldTLk5A09Z00; Mon, 24 Dec 2007 15:37:48 +0000 Received: from WarrenPC ([24.91.18.115]) by OMTA04.westchester.pa.mail.comcast.net with comcast id Ufdf1Y0032Uxt083Q00000; Mon, 24 Dec 2007 15:37:44 +0000 X-Authority-Analysis: v=1.0 c=1 a=Sv5m3IQ-AAAA:8 a=u5wn2L2PEFNjMSdAXMcA:9 a=Sjn73R5TIndVVXibxey2lWlmBTgA:4 a=U8Ie8EnqySEA:10 a=wk6s2zzMB60A:10 a=oltf0pfCdT4A:10 a=wCIym9mdt_1w6LwCn48A:9 a=JNqGKuIlerhOE0QiNq4A:7 a=Djpsti1YTr3dbeK5ZS9QvNIK3YEA:4 a=AfD3MYMu9mQA:10 Message-ID: From: "K2ORS" To: References: In-Reply-To: Date: Mon, 24 Dec 2007 10:37:41 -0500 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Windows Mail 6.0.6000.16480 X-MimeOLE: Produced By Microsoft MimeOLE V6.0.6000.16545 X-Karma: 0: X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,HTML_MESSAGE=0.001 Subject: LF: Re: E-field probes. Content-Type: multipart/alternative; boundary="----=_NextPart_000_0710_01C84619.06203580" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.6 required=5.0 tests=HTML_20_30,HTML_MESSAGE, MISSING_OUTLOOK_NAME 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-IP: 193.82.116.20 X-AOL-SCOLL-AUTHENTICATION: listenair ; SPF_helo : n X-AOL-SCOLL-AUTHENTICATION: listenair ; SPF_822_from : ? ------=_NextPart_000_0710_01C84619.06203580 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Dave A while back I came across an interesting HF/VHF active antenna design= by the Naval Research Laboratory which has dual polarization and is intend= ed for radio astronomy applications: http://www.ursi.org/Proceedings/ProcGA05/pdf/J03-P.15(0981).pdf Also check the following paper: Design and Evaluation of an Active Antenna for a 29-47 MHz Radio Telescope A= rray Ellingson, S.W. Simonetti, J.H. Patterson, C.D. =20 Dept. of Electr. & Comput. Eng., Virginia Polytech. Inst. & State Univ.; This paper appears in: Antennas and Propagation, IEEE Transactions on Publication Date: March 2007 Volume: 55, Issue: 3, Part 2 On page(s): 826-831 Location: St. Petersburg, Russia,=20 ISSN: 0018-926X INSPEC Accession Number: 9357586 Digital Object Identifier: 10.1109/TAP.2007.891866 Posted online: 2007-03-12 12:44:43.0 Abstract The eight-meter-wavelength transient array (ETA) is a new radio telescope co= nsisting of 12 dual-polarized, 38 MHz-resonant dipole elements which are ind= ividually instrumented, digitized, and analyzed in an attempt to detect rare= and as-yet undetected single dispersed pulses believed to be associated wit= h certain types of astronomical explosions. This paper presents the design a= nd demonstrated performance of ETA's dipole antennas. An inverted V-shaped d= esign combined with a simple and inexpensive active balun yields sensitivity= which is limited only by the external noise generated by the ubiquitous Gal= actic synchrotron emission over a range greater than the 27-49 MHz design ra= nge. The results confirm findings from a recent theoretical analysis, and th= e techniques described here may have applications in other problems requirin= g in situ evaluation of large low-frequency antennas=20 Happy Christmas! Vy 73 Warren ----- Original Message -----=20 From: G0MRF@aol.com=20 To: rsgb_lf_group@blacksheep.org=20 Sent: Monday, December 24, 2007 10:04 AM Subject: LF: E-field probes. Seasons greetings all. Does anyone know if the e-field probe can be adatped to HF frequencies? Some of you will know I am a member of Amsat and we have an opportunity wh= ere we could propose a single frequency 29MHz 'SSB' receiver on a satellite.= However, as we will not be allowed a large traditional antenna. I wondere= d if I could propose an e-field probe for 29MHz. Is there any data / design information anywhere which may help make a deci= sion? Regards David G0MRF ------=_NextPart_000_0710_01C84619.06203580 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Dave
 
     A while back I came across an interesting=20 HF/VHF  active antenna design by the Naval Research  Laboratory wh= ich=20 has dual polarization and is intended for radio astronomy applications:
 
http://www.ursi.org/Proceedings/ProcGA05/pdf/J03-P.15(0981).pdf
 
Also check the following paper:

Design and Evaluation of an Active Anten= na for=20 a 29=9647 MHz Radio Telescope Array
Ellingson, S.W.   Simonetti,=20 J.H.   Patterson, C.D.  
Dept. of Electr. & Comp= ut.=20 Eng., Virginia Polytech. Inst. & State Univ.;

This paper appears in: Antennas and Propagation, IEEE Transactions=20 on
Publication Date: March 2007
Volume: 55,  Issue: 3, Part 2
On page(s): 826-831
Location: St. Petersb= urg,=20 Russia,
ISSN: 0018-926X
INSPEC Accession Number: 9357586
Digital=20 Object Identifier: 10.1109/TAP.2007.891866
Posted online: 2007-03-12=20 12:44:43.0

Abstract
The eight-meter-wavel= ength transient=20 array (ETA) is a new radio telescope consisting of 12 dual-polarized, 38=20 MHz-resonant dipole elements which are individually instrumented, digitized,= and=20 analyzed in an attempt to detect rare and as-yet undetected single dispersed= =20 pulses believed to be associated with certain types of astronomical explosio= ns.=20 This paper presents the design and demonstrated performance of ETA's dipole=20 antennas. An inverted V-shaped design combined with a simple and inexpensive= =20 active balun yields sensitivity which is limited only by the external noise=20 generated by the ubiquitous Galactic synchrotron emission over a range great= er=20 than the 27-49 MHz design range. The results confirm findings from a recent=20 theoretical analysis, and the techniques described here may have application= s in=20 other problems requiring in situ evaluation of large low-frequency antennas=20
 
 
Happy Christmas!
Vy 73 Warren
 
 
 
----- Original Message -----
G0MRF@aol.com <= /DIV>
Sent: Monday, December 24, 2007 10:= 04=20 AM
Subject: LF: E-field probes.

Seasons greetings all.
 
Does anyone know if the e-field probe can be adatped to HF=20 frequencies?
 
Some of you will know I am a member of Amsat and we have an opportuni= ty=20 where we could propose a single frequency 29MHz 'SSB' receiver on a=20 satellite.  However, as we will not be allowed a large traditional=20 antenna.  I wondered if I could propose an e-field probe for 29MHz.
 
Is there any data / design information anywhere which may help make a= =20 decision?
 
Regards
 
David  G0MRF
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