Roy Lewallen wrote:
Thanks to all who responded. I see I've been misusing "ground wave" for
a long time, in place of "surface wave". And my apology to those I've
questioned about "ground wave" propagation at VHF/UHF. According to
correct usage, it does indeed exist -- just not with a surface wave
component.

Likewise, my apologies to anyone whom I've misled.

But I apologise with fingers crossed behind my back!

The IEEE Dictionary mavens have produced a very HF-centric definition of
"ground wave", by defining it to include all modes of propagation except
"sky wave"; where "sky" is exclusively defined as "ionospheric".

This definition completely ignores all the non-ionospheric VHF/UHF
propagation modes that don't involve the ground at all.

Since a misleading definition is worse than no definition at all, the
best policy for the term "ground wave" is to label it "Broken - Do Not
Use".


--
73 from Ian G3SEK 'In Practice' columnist for RadCom (RSGB)
http://www.ifwtech.co.uk/g3sek

Ian, G3SEK wrote:
"The IEEE Dictionary mavens have produced a very HF-cebtric definition
of "ground wave"."

Regretable. Seems clear that a ground wave would require interaction
with the ground. According to Terman it does. On page 803 of his 1955
edition, Terman says:

"The "ground wave" (also sometimes called surface wave) can exist when
the transmitting and receiving antennas are close to the surface of the
earth and are vertically polarized. This wave, supported at its lower
edge by the presence of the ground, is of practical importance at
broadcast and lower frequencies."

The ground wave requires the earth to participate in its propagation and
the earth gives the ground wave a continuation beyond the line-of-sight
without atmospheric or ionospheric intervention.

Best regards, Richard Harrison, KB5WZI

Ian White, G3SEK wrote:
The IEEE Dictionary mavens have produced a very HF-centric definition of
"ground wave", by defining it to include all modes of propagation except
"sky wave"; where "sky" is exclusively defined as "ionospheric".

"sky wave - a radio wave propagated obliquely toward, and returned from,
the ionosphere."

Apparently, if it's not returned from the ionosphere, it's not a
sky wave. That implies that the stars are not in the sky. :-)
--
73, Cecil http://www.qsl.net/w5dxp



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