[Antennas] Dipole Height

[JK]

Someone gave me 150 feet of Heliax  AVA7-50 1-5/8" coax. I think that 
will be lower loss than LMR-400 or RG-213.


Jay NE2Q


On Thu, Sep 17, 2015 at 10:42 AM, Ray, W4BYG wrote:

> I don't think I agree with this suggestion.
>
> At 40 meters typical RG-8 cables losses are much less for 90' to 100' 
> of cable, than the significant gain in low angel of radiation that 
> would occur with the higher installation.  RG-8 cable loss at 7.2 MHz 
> for 100' at a VSWR of 1:5 to 1 are about 1/2 db.  See:
>
> http://www.kc7hxc.us/links/radio/Coax%20Calc/Coax%20Calculator.html
>
> With antenna height of 7' AGL most of your energy is NVIS and going 
> straight up and down warming the clouds and worms.  At 90', most of 
> your energy is going out on the horizon at good angles where it should 
> be, for DX contacts.
>
> Big difference!
>
> 73,
> Ray, W4BYG
>
>
> On 9/17/2015 10:05 AM, David Robbins wrote:
>> once you factor in the extra loss for the feedline needed to get it 
>> up that high the improvement will be negligible.
>>
>>
>> Sep 17, 2015 09:34:15 AM, jkolin at optonline.net wrote:
>>
>>
>> Hey Ray,
>>
>>
>> Will my 40 meter dipole work better for DX at 90 feet above ground
>> instead of 7 feet above?
>>
>>
>> Jay...NE2Q
>>
>>
>>
>>
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>
>
> -- 
> I'm no longer young enough to know everything!
>
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