[Premium-Rx] Palomar Antennas

[Ahmet Gundes]

I have been experimenting with Loops and Short Dipoles for a few 
yars now.

My goal was basically to come up with an easy to use antenna system
which did not require much space and gave good performance as well
as tuned to the frequency of interest from a remote location.

I personally think that both Loops and Short Dipoles have very similar
performance.  The issue is to carefully design the entire system.

I checked the Palomar Loops on the web. Looks like they are intended more
for VLF and possibly have Ferrite Loops rather than Air Dielectric Loops.
I would be curious to see a circuit diagram of the Palomar Loops if 
anyone has it.

I am currently using remote tuneable short dipole and a loop easily covering
4MHz - 30MHz. However I have never tried to lower the frequency range of my
setup.  With both short dipole and loop, i can get amazing results as far
as Nulling out unwanted signals as well as local noise.  

Not to mention the added benefit of being able to change Polarization 
which is definitely a plus at higher frequencies such as on 15MHz and higher
broadcast bands ( i am mostly into bdcst listening ).  

As long as they are designe well they will perform well.  They definitely need
Low Noise Preamplifiers and would not compete with much larger antenna systems.
However they have their place and i would not do without Loops and Short Dipoles.

regards
Ahmet


> 
> Even with my relatively sensitive receiver (RF-590A with bypassed 
> preselector) I worry about weak signals from my loop below the 
> noise floor of the receiver.  Is there a good low noise preamp I 
> could use which would help?  Or would other frequencies swamp it?  
> Possibly I could insert the preamp after the receiver's 
> preselector?  Or am I simply at the limits right now?  I guess what 
> I am asking is, what is the best setup to get the really weak 
> stations when the antenna is less than perfect?
> 
> PS, the PRC-104 receiver seems more intelligible and possibly 
> slightly more sensitive, but a pain to tune around the band with.
> 
> 
> 
> 
> ----- Original Message ----- From: "Al Klase" <skywaves at webex.net>
> To: <DAVEINBHAM at aol.com>
> Cc: <premium-rx at ml.skirrow.org>
> Sent: Tuesday, August 02, 2005 6:38 PM
> Subject: Re: [Premium-Rx] Palomar Antennas
> 
> 
> > Hi Dave,
> >
> > I don't have any experience with the Palomar product, nor do you 
> > mention what bands you're working, but I have been playing with 
> > home-brew loops a fair amount in recent years.
> >
> > Unless the loop is amplified, the signals coming off the long 
> > wire will be much, much louder.  The real advantage is the loop's 
> > directional pattern, basically a figure-8, or a cardioid if it 
> > has a sense antenna (usually a short whip). This is most 
> > pronounced at medium frequencies and below.
> 
> 
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