Re: Inverted L for 160 meters

Posted by David Gilbert-2 on Aug 26, 2020; 12:04am
URL: http://elecraft.85.s1.nabble.com/Inverted-L-for-160-meters-tp7664325p7664331.html


Pretty sure there are some significant pattern differences between ANY
horizontal antenna and a vertical one on 160m ...  at least at heights
practical for amateur radio purposes.

That's probably why.

Dave  AB7E


On 8/25/2020 4:49 PM, Lyn Norstad wrote:

> Good gracious.  Why does everyone overthink 160m?  OK, maybe just because it's fun.  I get that.
>
> But as to operation, I have one (1) antenna, and it is a 360 foot EDZ (dipole) cut for 3.5 MHz.  It's great on all bands, 160 - 6m.  No radials needed.
>
> Specifically I worked 47 of the 50 states in one 24 hour period on 160m (holdouts were AK, HI and NV - all picked up within a day or two).
>
> I could 'splain more, if anyone is interested.
>
> 73
> Lyn, W0LEN
>
>
>
> -----Original Message-----
> From: [hidden email] [mailto:[hidden email]] On Behalf Of kevinr
> Sent: Tuesday, August 25, 2020 6:24 PM
> To: Elecraft Reflector
> Subject: [Elecraft] Inverted L for 160 meters
>
>   From what I can find, and what I can calculate, five wires, each ~130
> feet long, could make a nice inverted L for 160 meters.  One leg for the
> vertical and horizontal portion of the antenna.  Four legs for the
> counterpoise (ground plane).  There are many broken wire antennas stored
> in my shed which are fodder for the radials. Do all of the legs for the
> counterpoise need to be 1/4 wavelength or can I substitute some shorter
> lengths?  The feedpoint should somewhere above 50 ohms impedance.  As I
> add more radials that number will reach 50 ohms asymptotically.
>
> I can get the vertical part up to 70 or 80 feet above ground with the
> rest of it horizontal.  Most of the radiation should take place from the
> vertical part since it is closer to the feed point.  But there should be
> some effect from the direction of the horizontal portion.  How strongly
> does the direction of the horizontal portion effect the radiation
> pattern of the antenna system?  My property allows me to point it from
> 300 degrees around to 200 degrees so I have plenty of options.  Between
> 200 and 300 degrees there is a road used by loggers, and the folks
> maintaining the towers at the top of this mountain.  They can break any
> antenna lower than 80 feet above ground.  Spar poles and cranes clear
> out any dead limbs across the road.
>
> Inquiring minds...
>
> Kevin.  KD5ONS
>
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