Spike <Aero....@mail.invalid> wrote:
> On 20/05/2019 16:58, Jeefaw K Effkay wrote:
>> On Monday, May 20, 2019 at 10:28:57 AM UTC+1, Spike wrote:
>
>>> My 'crime' was to pose a question some years ago in .antenna asking
>>> which form of wave (ground, sky, space) carried what proportion of the
>>> RF power, radiated from a short vertical rod antenna at MF/low HF. Since
>>> then some 'Award-winning MM-zeros and modern Fulls' have used this as a
>>> stick with which to beat me, despite a) not getting a sensible answer on
>>> .antenna and b) getting a sensible answer on UKRAM. The latest
>>> reference to the episode was from Class B Brian Reay only yesterday, so
>>> perhaps I should have included that as well.
>
>> I did answer that at the time. Perhaps you missed it?
>
>> When the power leaves the antenna, it has no cognizance of whether it's
>> going to be a ground wave, direct wave or sky wave.
>
>> The signal might leave the transmitting antenna at an angle of 20º. If
>> it reaches one of the F layers of the ionosphere and is refracted,
>> clearly it's a sky wave. But if a listener on a hilltop 20km away
>> receives it, it's a ground wave. Or if it's picked up by a passing
>> aircraft, it's a direct wave.
>
>> Your problem can only be considered from the viewpoint of the receiving
>> antenna, not from that of the transmitting antenna.
>
> I'm not sure that's true. As Amateurs we put up aerials to get the
> result we want. For the sake of simplicity let's pretend that verticals
> give ground wave (and a little sky wave) and horizontals give sky wave
> (and a little ground wave). Now a distant station, set up for one
> polarization or another, *will* notice a difference in received signal
> strength if the sending station changes polarization - which mean, of
> course, that the received power has changed. The difference will in the
> first instance be due to the changed distribution of power between
> ground and sky waves at the sending station due to the different
> behaviours of the two polarizations. Now, at the time of posing the
> question I was interested in a particular set-up, which is why I asked
> the question in the form that I did, namely, a short vertical rod etc
> etc., as I wanted to know where the transmitted power was going. I can't
> say that I received a sensible answer, apart from one that recognised
> the issue and offered some approximate answers. I'm sorry if I missed
> your original reply.
>
> I guess some people are struggling with this as Google doesn't provide
> an answer.
People are “struggling” to give you the answer you want, Burt, as your
question is so badly malformed as to be gibberish. HTH, OM. YFI.