Topband: low inv-vee

[K4SAV]

If you run a NEC analysis it will show that a 160 dipole at a half 
wavelength height will blow away any vertical when the signal is 
broadside to the dipole.  The people that have tried this say it aint 
so.  At least some of the reasons are that NEC knows nothing about 160 
propagation and it knows nothing about the effect of Earth's electron 
gyrofrequency.  That varies a lot depending on where you are located on 
this earth. Analysis is nice and easy but you have to include everything 
for it to simulate the real world, and the real world on 160 is very 
complicated.

Jerry, K4SAV


On 3/28/2018 9:50 PM, Mark K3MSB wrote:
> I don't think so.  In my Electromagnetic Fields and Waves class in EE
> school (way back when dinosaurs just stopped roaming the earth and
> Constellations still graced the skies...) the prof derived the equation for
> a received signal.  The polarization terms disappeared after the first
> ionospheric bounce.
>
> 73 Mark K3MSB
>
>
> On Wed, Mar 28, 2018, 9:03 PM Steve Maki <lists at oakcom.org> wrote:
>
>> Interesting. Some say that on 160 vertical polarization rules, while on
>> 80, horizontal polarization rules (or at least *often* rules). Of course
>> polarization and angle of arrival are two different things...
>>
>> -Steve K8LX
>>
>> On 03/28/18 17:23 PM, Roger Kennedy wrote:
>>
>>> Well I've said it before and I'll doubtless say it again . . .
>>>
>>> In my experience, most DX propagation on 160m ISN'T low angle  (unlike
>> 80m
>>> when it nearly always IS.)
>>>
>>> For the past 45 years, at several different QTHs I've always used a
>>> horizontal co-ax fed halfwave dipole, only 50ft high . . . I'm sure most
>>> people would agree I put a respectable DX signal.  I've regularly worked
>> all
>>> over the world on Top band, and I've never had trouble getting through
>>> pile-ups to work Dx-peditions.
>>>
>>> Plus a dipole at 40 feet will never really be an inverted vee ! (just a
>>> horizontal antenna with drooping ends) - You'd have to have the centre at
>>> least 100ft high for it to be an inverted vee.
>>>
>>> Roger G3YRO
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