On Wed, 03 Sep 2003 16:33:14 GMT, "Wally" wrote this
crap:

Bobsprit claims to have made a VHF transmission of over 40nm. Given that his
antenna height is about 50 feet, that would require, for a line of sight
transmission, that the other antenna be about 800 - eight hundred - feet
above the water.

I believe that 40 miles is too close for skip, so could his transmission
have a 'terrain following' effect in the sense that the sea might act as a
ground plane?

Would anyone care to comment on the veracity of Bobsprit's claim?

You must be joking. The sea always acts as a ground plane. But a
skip is always on AM.

(Wally's answer: "Yes you are correct. I was just testing.")




Ave Imperator Bush!
Bush Was Right! Four More Years!

AM (600-1600 KHz) is a ground wave. It doesn't skip.

It travels further at night because the ionic concentrations in the Appleton
layer decrease from lack of sunlight and the solar wind.


"Horvath" wrote in message
...
On Wed, 03 Sep 2003 16:33:14 GMT, "Wally" wrote this
crap:

Bobsprit claims to have made a VHF transmission of over 40nm. Given that
his
antenna height is about 50 feet, that would require, for a line of sight
transmission, that the other antenna be about 800 - eight hundred - feet
above the water.

I believe that 40 miles is too close for skip, so could his transmission
have a 'terrain following' effect in the sense that the sea might act as
a
ground plane?

Would anyone care to comment on the veracity of Bobsprit's claim?

You must be joking. The sea always acts as a ground plane. But a
skip is always on AM.

(Wally's answer: "Yes you are correct. I was just testing.")




Ave Imperator Bush!
Bush Was Right! Four More Years!

On Thu, 04 Sep 2003 02:26:05 GMT, "Flounder" wrote
this crap:

AM (600-1600 KHz) is a ground wave. It doesn't skip.

It travels further at night because the ionic concentrations in the Appleton
layer decrease from lack of sunlight and the solar wind.

Well gee, that's a skip, isn't it?




Ave Imperator Bush!
Bush Was Right! Four More Years!

No, it's less attenuation in its normal mode of propagation. It has to do
with the decompression of the magnetosphere on the side of the earth away
from the sun..

Almost all AM radio stations transmit in the vertical polarization, the
antenna beam launch angle is low, it's difficult to get skip.

Horizontal polarized antennas (spaced properly above a ground plane) have a
launch angle that is favorable for skip.

If it was skip, there would be regions of no reception between regions of
reception. AM radio is continuous reception until it just fades out.

You can get AM wavelengths to skip, but it is not as common as in other
shorter wavelengths.

Henriech Hertz


"Horvath" wrote in message
...
On Thu, 04 Sep 2003 02:26:05 GMT, "Flounder" wrote
this crap:

AM (600-1600 KHz) is a ground wave. It doesn't skip.

It travels further at night because the ionic concentrations in the
Appleton
layer decrease from lack of sunlight and the solar wind.

Well gee, that's a skip, isn't it?




Ave Imperator Bush!
Bush Was Right! Four More Years!

So, can you explain tropo scatter?
krj

Flounder wrote:
No, it's less attenuation in its normal mode of propagation. It has to do
with the decompression of the magnetosphere on the side of the earth away
from the sun..

Almost all AM radio stations transmit in the vertical polarization, the
antenna beam launch angle is low, it's difficult to get skip.

Horizontal polarized antennas (spaced properly above a ground plane) have a
launch angle that is favorable for skip.

If it was skip, there would be regions of no reception between regions of
reception. AM radio is continuous reception until it just fades out.

You can get AM wavelengths to skip, but it is not as common as in other
shorter wavelengths.

Henriech Hertz


"Horvath" wrote in message
...

On Thu, 04 Sep 2003 02:26:05 GMT, "Flounder" wrote
this crap:


AM (600-1600 KHz) is a ground wave. It doesn't skip.

It travels further at night because the ionic concentrations in the

Appleton

layer decrease from lack of sunlight and the solar wind.

Well gee, that's a skip, isn't it?




Ave Imperator Bush!
Bush Was Right! Four More Years!

As in tropo scatter radar? Communication? Sensing? Profiling?


"Kelton Joyner" wrote in message
...
So, can you explain tropo scatter?
krj

Flounder wrote:
No, it's less attenuation in its normal mode of propagation. It has to
do
with the decompression of the magnetosphere on the side of the earth
away
from the sun..

Almost all AM radio stations transmit in the vertical polarization, the
antenna beam launch angle is low, it's difficult to get skip.

Horizontal polarized antennas (spaced properly above a ground plane)
have a
launch angle that is favorable for skip.

If it was skip, there would be regions of no reception between regions
of
reception. AM radio is continuous reception until it just fades out.

You can get AM wavelengths to skip, but it is not as common as in other
shorter wavelengths.

Henriech Hertz


"Horvath" wrote in message
...

On Thu, 04 Sep 2003 02:26:05 GMT, "Flounder" wrote
this crap:


AM (600-1600 KHz) is a ground wave. It doesn't skip.

It travels further at night because the ionic concentrations in the

Appleton

layer decrease from lack of sunlight and the solar wind.

Well gee, that's a skip, isn't it?




Ave Imperator Bush!
Bush Was Right! Four More Years!

On Thu, 04 Sep 2003 13:20:03 GMT, "Flounder" wrote
this crap:

No, it's less attenuation in its normal mode of propagation. It has to do
with the decompression of the magnetosphere on the side of the earth away
from the sun..

Actually it's the ionosphere,

Almost all AM radio stations transmit in the vertical polarization, the
antenna beam launch angle is low, it's difficult to get skip.

Were we talking about commercial AM radio? I thought we were talking
about SSB.




Ave Imperator Bush!
Bush Was Right! Four More Years!

Horvath wrote in :

On Thu, 04 Sep 2003 13:20:03 GMT, "Flounder" wrote
this crap:

No, it's less attenuation in its normal mode of propagation. It has to do
with the decompression of the magnetosphere on the side of the earth away
from the sun..

Actually it's the ionosphere,

Almost all AM radio stations transmit in the vertical polarization, the
antenna beam launch angle is low, it's difficult to get skip.

Were we talking about commercial AM radio? I thought we were talking
about SSB.

You just never seem to be on the right page, do you?

Bertie

On Thu, 04 Sep 2003 02:26:05 GMT, "Flounder" wrote
this crap:

AM (600-1600 KHz) is a ground wave. It doesn't skip.

With the proper antenna, such as a dipolar, it will.




Ave Imperator Bush!
Bush Was Right! Four More Years!

Horvath wrote in :

On Thu, 04 Sep 2003 02:26:05 GMT, "Flounder" wrote
this crap:

AM (600-1600 KHz) is a ground wave. It doesn't skip.

With the proper antenna, such as a dipolar, it will.


So that explains why you can get radio in your head so well.


Bertie