[CALV-AUXCOMM] The plan as per N3IDX and N3AE

[Shawn Donley]

Jim,

The location of the coils does make a difference.   They were developed to be "add-on" to antennas already built to W9WIS's article at: 

http://www.marc.on.ca/marc/ares/documents/NVIS_2040-80_20antenna.pdf 

The coils with the # of turns and lead length specified go between the top cap and the wires that would have otherwise been mounted to the top cap.

Shawn
N3AE

 
> On April 19, 2017 at 10:27 AM Jim Montgomery via CALV-ARES <calv-ares at mailman.qth.net> wrote:
> 
> 
> 
> Hi Jim,
>  
> Fine article you posted, thanks.  I often wondered how do you calculated where to put the coils?  I see that there are close to the end of the line, but how critical is that?
>  
> Again, many thanks for the post.
>  
> 
> tnx es 73, de
> Jim
> WB3KAS
> PRGE ARES EC
> MDC SEC
> 
>  
>  
> -----Original Message-----
> From: Jim Tetlow <k3uga at comcast.net>
> To: ARES, Calvert <calv-ares at mailman.qth.net>
> Sent: Wed, Apr 19, 2017 10:13 am
> Subject: [CALV-AUXCOMM] The plan as per N3IDX and N3AE
> 
> 
> http://arrl-ohio.org/SEC/nvis/Modified%20AS-2259%20NVIS%20Antenna.pdf
> 
> 
> 
> 
> 
> Here is the original plan that was developed for this simple, but useful portable  80/40 meter antenna. The coils could be our next workshop project??? 
> It might be fun to have a couple of these bad boys for future use, as we don't seem to know where all the antennas are now!  The pvc  pipe forms are easy to get, the wire is easy, the hardware is easy.
> Surplus fiberglass tent poles (4@ < 4ft ) with a baseplate  is easy to find at any local show or ebay.
> 
> The problem I see is the footprint of the wires would be  about An 85 ft diameter circle......kinda large open area. I know if you increase the height of the mast to  > 30 feet its harder to raise and support, and it changes the angle, maybe Shawn could look at that with the antenna modeling program? Smaller footprint might make easier placement? But 30 ft may be too tall. Somewhere in my collections of stuff I have a surplus army antenna mast field kit for NVIS antenna, these are tapered poles that go together and need guying, but I think it approaches 26-30 ft tall.  
> Sent from my iPad,
> Best Regards, 73,
> Jim Tetlow______________________________________________________________
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