[TenTec] OT: Question to the group -tuner and dipoles

[Darrell Bellerive]

A couple more good reads:

http://www.seed-solutions.com/gregordy/Amateur%20Radio/Experimentation/Vee/YagiModel.htm

http://www.w8ji.com/nvis_n_v_i_s_antenna.htm

In the first article above, W8WWV found the maximum vertical gain with a 
dipole 1/2 wavelength above the ground with a reflector wire 39 feet 
down from the antenna. Too bad as most of us can't even consider a 
dipole 131 feet off of the ground!

73, Darrell VE7IU


On 16-07-18 02:28 PM, Jim Brown wrote:
> RIGHT!
>
> The usefulness of very low antennas for short distance work is a MYTH.
>
> Slide 19 in this link shows that an 80M dipole  produces maximum 
> radiation at high angles (70 degrees) at 60 ft, and that raising it to 
> 90 feet loses only about 1 dB at high angles.
>
> http://k9yc.com/VertOrHorizontal-Slides.pdf
>
> I won't question that the very low antenna described might be quieter 
> than a high one -- in any given QTH it may be, but it is a LOUSY TX 
> antenna for ANY distance or angle.
>
> 73, Jim K9YC
>
> On Mon,7/18/2016 1:26 PM, Darrell Bellerive wrote:
>> That may work well for receiving, but for transmitting the ground 
>> losses at such a low height would be substantial. QRP with 100 watts. 
>> :-)
>>
>> 73, Darrell VE7IU
>>
>> On 16-07-18 01:08 PM, Stuart Rohre wrote:
>>> Working at 1/8 wave above soil, brings as signal to noise gain, in 
>>> that "skip static" from Summer thunderstorms is greatly attenuated 
>>> or not picked up at all.
>>>
>>> NVIS brought back 80m to usefulness for Field Days due to the 
>>> reduced noise floor when the antenna was 5 to 6 feet off ground with 
>>> a reflector at grass top level. (after mowing).
>>>
>>> -Stuart Rohre
>>> K5KVH
>>
>
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-- 
Darrell Bellerive
VE7IU