Cascadia dipole?

I'm waiting on the idiots at ups to get my 955 xxx sent to my company in Chicago... I'll probably run that radio full time all the time....

 

could almost guarantee ya that........

 

OK I will.
...
OK I'm done.

OK I guess.

OK I guess you're right but what about MW/SW broadcasting which uses sky-wave propagation in order to function?

Special circumstances happen nightly then, when there is a shift in the ionosphere and propagation happening often and predictably, like listening to radio china or BBC London here as I sit in my cheap cosco chair?

Skywaves are somewhat predictable, as are ground waves - LW/MW Dx - again the reason for clear channels on the AM broadcast band so other stations can be heard that are not local.

While you are on the right page with this being Ionospheric Propagation, there is a lot to be said about how it is done and why it can be done regularly that is missed.

Well Yes and NO, Knife edge propagation if I remember right has more to do with optics and EHF/THF communications than it does with HF/VHF. If I remember right it has to do with something called Huygeys - Fresnel principle which the Fresnel–Kirchhoff diffraction formula was derived to prove that principle - I may be wrong about how that goes because it has been over 35 years since I had to talk about it in detail.

There was a lot of work done in the late 50's and early 60's on this and other propagation means (lack of a better term) for the up and coming space race. If you read John Egli work, you can see why knife edge propagation takes place, it is not in the HF range. But then I remember this all from memory because it isn't important.

HOWEVER, I think you got this 'knife edge' propagation mixed up with 'grayline' propagation, which simply happens at twilight on 15, 11 and 10 meters allowing DX conditions to become available - or as you put it opening up of the band for people.

It can be applied to Rabbi's situation, I could see it happen easily being in the right place for initiating a bounce and having a small window on the other side of the bounce to communicate at a specific time of day, every day so this happens a lot on those frequencies or at least it does for many lucky people.

Actually it is used for reliable communications within two bands.

The purpose of my posting about it has to do with the illustrating of the wave angles of departure from the antenna, not the use of NVIS on the 11 meter band - which has been done but not really with good results.

BUT as I said, LoS isn't applicable here, it is HF, not VHF or UHF.[/QUOTE]

 

My situation is strictly groundwave propagation. If it can't be duplicated at will, I generally disregard it as skywave.

 

Not according to this -

AND I have said this before, and here again, it looks like NVIS conditions exist in your claims.

 

Would NVIS be predictable and allow me to blanket my signal across a 160 mile radius of my location in a predictable manner? How would wet ground improve NVIS conditions, but not groundwave conditions?
(I have a much easier time under wet conditions than dry ones and it seems NVIS would not allow me to remain in contact for an 80 mile conversation)

 

Yes

But remember I'm talking about conditions that mimic that allows the use of a NVIS system, not the exact system. It can happen regularly (ask the military what they do) up to 200 miles or even more.

 

Wouldn't horizontal polarization be necessary for NVIS to occur?

 

I just thought of something else. If NVIS is occuring, and 4 watts barely makes it 45 miles, but using brute force and still vertically polarized to make it another 30 or so miles works consistently, how would we know NVIS and not groundwave propagation is occuring?