Topband: "Artificial" Propagation...?

[Arthur Delibert]

As I remember the earlier project, it was an effort in the early or mid 1960s to create perpetual worldwide twilight by shooting millions of tiny copper needles into the upper atmosphere.   I remember reading at the time that they became magnetized and stuck together for that reason.  In any event, instead of dispersing, they orbitted for awhile as a large clump. --Art Delibert, KB3FJO
 > From: n7rt at cox.net
> To: k9la at frontier.com; topband at contesting.com
> Date: Sat, 10 Mar 2012 21:13:45 -0700
> Subject: Re: Topband: "Artificial" Propagation...?
> 
> Carl,
> I thought someone, maybe NASA tried this many years ago and their folley was 
> that the universal gravitational force equation did in the whole project 
> because once 2 particles attach to one another that doubles the mass. After 
> that, a 3rd joins the double, and then a 4th, and so on until you have this 
> big bunch needles doing nothing but orbiting the Earth.
> I don't see that this is any different.
> 73 Hardy N7RT
> 
> 
> ----- Original Message ----- 
> From: <k9la at frontier.com>
> To: <topband at contesting.com>
> Sent: Saturday, March 10, 2012 7:10 PM
> Subject: Re: Topband: "Artificial" Propagation...?
> 
> 
> >> But more importantly, 100 km is too
> >> low to provide much help to us
> >> Topbanders. This is far below the E
> >> and F layers of the ionosphere that
> >> we rely on for DX.
> >
> > The peak of the nighttime E region is around 110 km, so 100 km is not too 
> > far below the E region. The lower E region is also where most absorption 
> > at night occurs on 160m.
> >
> > More to the point, refraction is inversely proportional to the square of 
> > the frequency. An electromagnetic wave at 1.8 MHz bends more and doesn't 
> > get as high into the ionosphere as our HF (3-30 MHz) energy.
> >
> > At night, with the E region critical frequency around 0.4 MHz, energy at 
> > elevation angles lower than about 5 degrees is refracted back to Earth by 
> > the E region.
> >
> > Thus the E region may be more important than we normally think.
> >
> > Carl K9LA
> > _______________________________________________
> > UR RST IS ... ... ..9 QSB QSB - hw? BK 
> 
> _______________________________________________
> UR RST IS ... ... ..9 QSB QSB - hw? BK