Search results

So what do you suggest is the angle of radiation of a horizontal dipole at different heights? Yes it does differ antenna to antenna. We must compare apples to apples. We have to start with a reference point. A horizontal dipole and its ground gain seems like a very good starting point to me. I...

This is 11m not 80m or 160m. I am aware of ground gain from for example a horizontal dipole but that is high angle. Statistically nothing DX wise comes in more than 18 degrees on 11m and most at 5 and 9 degrees on 10/11m. So having gain at 28/29 degrees is pure wasted energy. Possibly it may...

Arrl " when an electromag wave enters the ionophere it couples into two characteristic waves. The ordinary and extraordinary wave....thus the use of horiz or vert polarized antenna on hf is a moot with respect to polarization as one or the other or both characteristic waves will propagate"

I am interested in seeing one study where this was proved. This must be critically important if it is true. I don't believe horizontal (sorry I wrote vertical) is better for DXing. It will be pure luck what comes down and works best, be it vertical or horizontal. Not to mention that there...

Link just goes to definition of word empirical.

Allow me to reboot that post.. welcome to the forum. Salt mine will be WAY below the surface effects of ground on the RF fields. On a hill you will achieve a lower angle of radiation with any antenna due to the ground reflections being positively affected when hitting your main lobe again. Read...

"Any manufacturer or owner of antennas advises against vertical polarization on DX" A load of rubbish. 250kms sounds about right for your line of sight/direct wave height ASL. I have a lot of hilltop experiences.

I wish you all the best too.I probably have a lot of CBer left in me. I like a basic yet thorough approach. 9 times out of 10 that works just as well as a more complicated and expensive way. In fairness we need to deduct coil/balun winding/core losses from any other non resonant / non close to...

Matching is unquestionably in the category of loss, unless it is a 1/4 wave without need of a coil or an LC match. I do understand everything you have said and do not directly see pattern gain as the direct opposite of a coil or LC loss. However if you can get pattern gain, it is worth taking as...

ATU's - often coveted, you would be forgiven for thinking they are perfect and even desirable devices given statements such as : "It'll match a bit of wet string" Losses ? Rarely ever spoken of. From what I can gleen it seems you lose around 1dB on an average expected match. Of course this is a...

You are probably not going to want the antenna touching any leaves or branches... there is that to consider. The best plan would surely be right at the top as high above the top of the tree somehow in the clear. Had a scan through this, odd looking antenna.

Fellow radio enthusiast, I wish you well.

I consider it often. However it is quite difficult for DXers because on any given day there may be better or worse conditions and paths for any given angles. The ideal is having a nice wide spread of angles up to around 30 degrees with the best antenna you can use on the day. It is difficult to...

I also have thought this about modelling.. it would be nice for example to model sloping ground and its possible influences. I am skimming this at the moment due to lack of time. I do know that the faster a slope off gradient on a hill the better the influence on lower angle radiation. This in...

Hi The DB... I still need to read through more of the above when time permits but spotted your question. Well.... no near or far field ground reflections for a start and it is like having an antenna in an infinite void. I imagine it was because some antennas have greater influence from ground...

I must say I did think current cannot exist without volts so it seems they are interdependent for either to exist. I think The DB basically meant for the purpose of antennas current centre's seem generally to be given greater weight than voltage in any kind of imagery and seemingly that includes...

Thanks I will give this a second and third read.. but it seems well explained.

I think there will have to be an acceptance of this out of phase radiation being represented in this way (despite it being part of one and the same sine wave). It seems to be just how modelling software does it. Here is a 5/8 wave animated GIF showing the out of phase portion of a 5/8 wave...

I can understand there are 2 current centres of opposing polarity but they are not out of phase as out of phase implies 2 separate sine waves with a 180 degree phase shift. They are opposing polarities of the same single sine wave. I would have thought.

Something I notice is that the sine wave on the gif only goes 1/2 way up each 1/4 wave element when volts peak at the ends of the dipole... so with a full wave maybe the component that cancels is somehow in the second 1/4 of each element. I am totally clutching at straws now though.