[R-390] Help with info on a STRANGE SP-600

[Michael Murphy]

Bob,

Concerning Diversity operation at HF, R390A, SP600 or otherwise, you have
the right idea. Using two different types of antennas should work OK.

There are three ways to use Diversity at HF.

1. Simple Space Diversity - Here we need two identical antennas, that is the
same polarization, gain, and arrival angle. These could be a couple of
dipoles at 100 feet. They should be spaced out several wavelenths apart (!!)
however for diversity to really work.

2. Polarization Diversity - This setup purposely uses two different kinds of
antennas, like what you were suggesting, a Carolina Windom and an inverted
L. The antennas should not have drastically different gains, or the system
will not "vote" properly. Better choices might be a Marconi vertical or
sloper dipole and a regular dipole.

3. Arrival angle Diversity - Requires the use of a receiving antenna with
discrimination in the vertical plane. For this reason it does not appear to
be a method that is in common use for HF. With a vertically steerable array
comprising short vertical monopole or active loops, worthwhile improvements
are possible by isolating the different ionospheric mode and using them in
diversity.

This was from a paper
http://murray.newcastle.edu.au/users/staff/eemf/ELEC351/SProjects/Fitzsummon
s/elec352.htm
Composed by:
Troy Morris
Jay Fitzsummons
Tony Parezanovic of Newcastle College

Mike WB2UID

----- Original Message -----
From: "John KA1XC" <tetrode at comcast.net>
To: "R-390 reflector" <r-390 at mailman.qth.net>
Sent: Tuesday, July 20, 2004 11:06 AM
Subject: Re: [R-390] Help with info on a STRANGE SP-600


> Bob,
>  check out the Hammarlund Historian page (is that Les ?), there's a
> paragraph about the R-450/FRR-28 towards the bottom.
> http://www.hammarlund.info/sp600.html
>
> BTW looks like removing the ncr from the file name in the 3d link fixed
it.
>
> 73 ,
> John
>
>
> ----- Original Message -----
> From: "Rbethman" <rbethman at comcast.net>
> To: <R-390 at mailman.qth.net>
> Sent: Tuesday, July 20, 2004 9:46 AM
> Subject: [R-390] Help with info on a STRANGE SP-600
>
>
> > Fixed the THIRD link.  Have NO bloody idea why it didn't work.
> >
> > What's worse - I'm a computer freak!
> >
> > Try now.
> >
> > Bob
> >
> > Gang,
> >
> >     I've acquired a "peculiar" Hammarlund SP-600.
> >
> >     It is a Model J-11, s/n 9758. [No "X"]
> >
> >    Modified by Northern Radio Company for the Diversity Aspects.  NRC
> > Type 159, Model I, S/N 740.
> >
> >    Tagged Receiver, Radio R-450/FRR-28.
> >
> >         <http://home.comcast.net/~rbethman/sp600j11front.JPG>
> >         <http://home.comcast.net/~rbethman/sp600j11rear.jpg>
> >         <http://home.comcast.net/~rbethman/sp600j11data.jpg>
> >         <http://home.comcast.net/~rbethman/sp600j11.jpg>
> >
> > Bob - N0DGN
>
>
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