----- Original Message -----

From: [email protected]

To: [email protected]

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 where we could propose a single frequency 29MHz 'SSB' receiver on a satellite.  However, as we will not be allowed a large traditional 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 decision?

 

Regards

 

David  G0MRF

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 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 Antenna for a 29?47 MHz Radio Telescope Array Ellingson, S.W.   Simonetti, J.H.   Patterson, C.D.   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, 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 consisting of 12 dual-polarized, 38 MHz-resonant dipole elements which are individually instrumented, digitized, and analyzed in an attempt to detect rare and as-yet undetected single dispersed pulses believed to be associated with certain types of astronomical explosions. This paper presents the design and demonstrated performance of ETA's dipole antennas. An inverted V-shaped design combined with a simple and inexpensive active balun yields sensitivity which is limited only by the external noise generated by the ubiquitous Galactic synchrotron emission over a range greater than the 27-49 MHz design range. The results confirm findings from a recent theoretical analysis, and the techniques described here may have applications in other problems requiring in situ evaluation of large low-frequency antennas

Happy Christmas! Vy 73 Warren