On Monday 24 December 2007 16:04, [email protected] wrote:
> 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?
>
I'm using an e-field antenna in HF, it's about 6 - 10 dB lossy versus an 1/2
wave dipole. The probe is a beer can.
In the earth environment the emf developed at the e-field probe is referenced
to the ground potential.
In open space the spacecraft body is the reference potential but you should
consider the [(delta voltage) over (delta space)] as function of the electric
field strength .
I think that the spacecraft to e-field_probe distance is very little, so the
emf is also little. May be that a "long tail" connected to space craft body
may help.
Some references:
(1) Christof Rohner, "Antenna Basics", Rohde&Schwarz, 1999 (search WEB with
GOOGLE)
(2) SCHWARZBECK MESS - ELEKTRONIK, "VAMP 9243 9 kHz - 30 MHz Low noise active
monopole antenna", http://www.schwarzbeck.de/Datenblatt/m9243.pdf
(3) SCHWARZBECK MESS - ELEKTRONIK, "Calibration of Vertical Monopole Antennas
(9kHz - 30 MHz)" (search WEB with GOOGLE)
73 de Claudio, ik2pii
--
Claudio Pozzi - Happy Linux User - http://www.qsl.net/ik2pii
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