--- In ultralightdx@..., "farmerik" <farmerik@> wrote:

I was using the ferrite rod from you last night, and comparing it to

the 2 foot air core. I noticed the dB S/N numbers are Much higher on the
ferrite, and the dBu numbers are much, much higher on the air core. As
the numbers tell, the high signal strength does not help much if the
noise is higher too.

This is a problem with unbalanced air-core antennas. They tend to act as
loops and random-length pieces of wire. They are more susceptible to
picking up noise. A balanced air-core loop is very quiet.

73,

Jim, KR1S
http://kr1s.kearman.com/ <http://kr1s.kearman.com/>
http://qrp.kearman.com/ <http://qrp.kearman.com/>