[TenTec] 17 Meter Antenna

[Don KO7i]

One point 500/MHz =1/2 wavelength 
I would hate for someone to think that is all the wire they need to use for a delta loop. 
Using the 1/4 wave 75 ohm transmission line is vital.
73 Don KO7I 

Sent from my iPad

> On Nov 22, 2014, at 11:09 PM, Rick - DJ0IP / NJ0IP <Rick at DJ0IP.de> wrote:
> 
> Reed, a 17m vertical delta loop (no a lazy loop) is what I'm talking about,
> and you need only about 20 ft. of width for it.  It takes up less space than
> a dipole.  The point is at the top of the single pole and the horizontal
> wire is at the bottom.  The feedpoint is 1/4 wavelength down either leg from
> the point.  Use a quarter wavelength matching stub of RG-59 or RG-11.  The
> 50 Ohms the rest of the way.
> 
> Here is a picture of my 40m vertical delta loop:
> http://www.dj0ip.de/my-favorite-antennas/my-favorite-40m/ 
> Just scale it down to size for 17m.
> The exact length of the sides and horizontal wire are not critical, but the
> sides must be at least 1/4 wavelength long.
> 
> You'll maybe notice that the quarter wavelength of wire above the feedpoint
> on my 40m loop looks just a little long.
> It is longer than a calculated quarter wavelength if when using a dipole
> formula (468/f).  That's because there is no "End Effect" present in a loop.
> Use 500 instead of 468 (or "250" for a quarter wavelength) when calculating
> where to place the feedpoint.
> 
> 73 - Rick, DJ0IP
> (Nr. Frankfurt am Main)
> 
> 
> -----Original Message-----
> From: TenTec [mailto:tentec-bounces at contesting.com] On Behalf Of Reed
> Sent: Sunday, November 23, 2014 12:05 AM
> To: tentec at contesting.com
> Subject: [TenTec] 17 Meter Antenna
> 
> Yeah Rick I have heard good things about the delta loop.  I don't know if I
> have the real estate for one, but will look into it. I have 2 portable
> magnetic loop antennas that work really well for their size, but they are
> not designed for wet WX.  Low noise is one great advantage of any loop
> antenna.
> 
> Thanks!
> Reed  W4JZ
> 
>> Reed, try a full wave delta loop,
>> Horizontal segment on the bottom
>> Fed in one corner with 1/4 wavelength of 75 Ohm coax, then fed to the 
>> shack with 50 Ohm coax.
>> You'll knock em dead with that!
> 
>> 73 - Rick, DJ0IP
>> (Nr. Frankfurt am Main)
> 
> 
>> Thinking about building a Moxon. Easy to build &
>> inexpensive.   Anyone here used one before?
> 
>> 73,
>> Reed  W4JZ
> 
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