Daniele Tincani pisze:
Hello LF,
a very interesting discussion is in progress on the reflector on
ferrite rx antennas. My understanding however is that until now we
have been talking about narrow-band antennas. May I ask the experts if
a wide-band ferrite antenna could be feasible, able to (partially)
match the "panoramic" approach of SDR receivers, at least in the
LF/NDB and/or MW bands? Such an "ideal" antenna would combine some
advantages of air-cored loops with a reduced size (uhm... too "ideal"
to be real :-))
Regards
Daniele
Hello Daniele, LF
your suggestion about wide-band ferrite antenna has prompted me to
another 'experiment' which i will try to make possibly in the
forthcoming weekend. Being 'triggered' by Stefan ideas , constructions
using large ferrite antenna
yesterday i have built a simple parallel LC network followed by a
buffer/amplifier where L has been delivered by a fairly large ferrite
rod ...
The final receiving device was SDR-IQ of RFSpace.Inc So far this sdr
receiver has been used in the VLF/LF region using my air loop ( 11
turns, 1 sq. meter area, placed on my balcony)
along with the "wide-band" use of the OP27 - pse, see:
http://ik4hdq.net/doc/testi/smlloop.pdf for idea, details. scheme etc...
This setup has allowed me to successfuly receive Alpha (rsdn-20) stns,
SAQ, 137 kHz transmissions/beacons and also some air NDB's and
yesterday evening it was used for comparisons between ferrite antenna
and air loop ( dcf39 was used as signal source)
so, according to your question/idea - i simply replace my air loop by
this ferrite antena therefore will get a wide-band ferrite antena
configuration
and will do some rx'ing...
73, Piotr,sq7mpj
qth: Lodz/jo91rs/
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