[Elecraft] Inverted L for 160 meters

[Barry LaZar]

Kevin,

     Be careful when doing these comparisons. A 1/4 wave over a ground 
plane unless it has a really good radial system may not be as efficient 
than your inverted L. What I would normally suggest is an A/B test using 
signal strength at the receiving station, but that has it flaws also, 
what's the pattern.

73,

Barry

K3NDM

On 8/25/2020 8:21 PM, kevinr wrote:
> I am hearing quite a difference between my inverted V and my 1/4 wave 
> over a ground plane.  For the last few weeks I've been hearing less 
> noise on the vertical.  Enough less to pull more ops out of the 
> noise.  When I try the inverted L I expect there to be a little more 
> noise than the vertical, but less than the doublet. Now to test that 
> hypothesis.
>
>    Kevin.  KD5ONS
>
>
> On 8/25/20 5:04 PM, David Gilbert wrote:
>>
>> 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: elecraft-bounces at mailman.qth.net 
>>> [mailto:elecraft-bounces at mailman.qth.net] 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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>>
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