Chuck Rippel saw this new antenna and posted it. It is very
interesting, tho' expensive. Chuck sez:
Saw an ad in WorldRadio Magazine for this new directional antenna made
by National RF in San Diego, CA. Using a series of plug-ins, including
one that can be user defined, the antenna will cover from about 10 khz
through 2mHz.
<http://www.nationalrf.com/type_nlf-2.htm>http://www.nationalrf.com/type_nlf-2.htm
Chuck Rippel
Chesapeake, VA
Bill Bowers and I did a lot of experimenting with ferrite rod
antennas about a decade ago, building up to the locally famous
Monster, which was 3" diameter and 8 feet long. With all of that
ferrite, I think it weighed something like 600 plus pounds.
Basically, what we found out was that the gain of the antenna is
proportional to its size of ferrite.... you just can't beat the laws
of physics here, bigger is better AND the sharpness of the null is
directly proportional to the slenderness of the ferrite. The National
RF antenna sports a 17" long rod, making it - potentially - one of
the finest of its type ever produced commercially. I sure would like
to read a thorough review by an experienced MWaver. This may be one
of the first antenna products created to meet the renewed interest in
the ham community for 500 kHz. DXing.
Anybody got one of these beauties yet??
John B.
Stillwater, Oklahoma, USA
Rcvrs: WiNRADiO 313e, Eton e1, NRD-535(kiwa-mods)
Antennas: 700' NE/SW mini-Bev, Wellbrook Phased Array (pre-production version)
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