Brenda Ann Dyer wrote:
Our AFN-TV satellite dish looks pretty much at the horizon to see the bird
they use here. Under normal circumstances, we get a good solid signal with
a level of about 89 and a quality of 9 or 10. When it rains hard, that can
drop to 60 and 3 or 4.. and sometimes it goes out completely. It's funny
sometimes that there can be no rain here locally, but raining hard in the
distance between the dish and the bird, and we'll lose the signal
completely. I think the only thing with water penetration is Richard L.

Yes and, as such, a bigger dish would rectify the problem.

--
Now Playing: 000. Lenny Kravitz - [Mama Said #04] It Ain`t Over `Til It`s
Over [211kbps m4a]

Stephen M.H. Lawrence wrote:
"Richard L." wrote:
| If you're getting weather-related drop-outs, it means your dish
| installation is inadequate -- not big enough, not pointing in the
| right direction, or suffering from water penetration.
|
| --
| Richard L.

Wrongo, Limey-boy!

Study the physics of microwave propagation,
paying particular attention to moisture attenuation,
then get back with the group when you're up to speed.

More excuses from digital shills: It seems like they've got
an answer for everything!

Does the same thing with Ku-band analog. And *doesn't* happen with
C-band digital. (our most critical link at work is Ku-band digital; we
have a C-band digital hot standby)

You can't eliminate the dropouts completely but increasing the gain of
the system *will* improve the situation. When the signal fades due to
rain attenuation, a higher-gain system will keep the signal above the
noise threshold longer.
--
Doug Smith W9WI
Pleasant View (Nashville), TN EM66
http://www.w9wi.com

Richard L. wrote:

(snip)

Gaaahhh!

My sincere apologies, Richard. Forgive me for
an all - too - obvious case of mistaken identity!

From the "FWIW" Department: Your intellect is
clearly superior to that of "DAB sounds worse than FM."

(and now you know that Alzheimer's can start
quite young)

73,

Steve Lawrence
Burnsville, Minnesota

"Stephen M.H. Lawrence" wrote in message
om...
Richard L. wrote:

(snip)

Gaaahhh!

My sincere apologies, Richard. Forgive me for
an all - too - obvious case of mistaken identity!

From the "FWIW" Department: Your intellect is
clearly superior to that of "DAB sounds worse than FM."

(and now you know that Alzheimer's can start
quite young)

73,

Steve Lawrence
Burnsville, Minnesota

Probly from all those trout you ate. That mercury ya know )

--
73 and good DXing.
Brian
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
A lot of radios and 100' of rusty wire!
Zumbrota, Southern MN
Brian's Radio Universe
http://webpages.charter.net/brianehill/

In article ,
Doug Smith W9WI wrote:

Stephen M.H. Lawrence wrote:
"Richard L." wrote:
| If you're getting weather-related drop-outs, it means your dish
| installation is inadequate -- not big enough, not pointing in the
| right direction, or suffering from water penetration.
|
| --
| Richard L.

Wrongo, Limey-boy!

Study the physics of microwave propagation,
paying particular attention to moisture attenuation,
then get back with the group when you're up to speed.

More excuses from digital shills: It seems like they've got
an answer for everything!

Does the same thing with Ku-band analog. And *doesn't* happen with
C-band digital. (our most critical link at work is Ku-band digital; we
have a C-band digital hot standby)

You can't eliminate the dropouts completely but increasing the gain of
the system *will* improve the situation. When the signal fades due to
rain attenuation, a higher-gain system will keep the signal above the
noise threshold longer.

Rain is not the only problem for satellites. How about when they line up
with the Sun? Doesn't that also cause problems?

--
Telamon
Ventura, California

"Telamon" wrote in message
...
Rain is not the only problem for satellites. How about when they line up
with the Sun? Doesn't that also cause problems?



Indeed it does... and this is one of the times of the year that this happens
in the northern hemisphere. It also affects uplinks, though not so badly.
Having a larger dish doesn't necessarily help in this case, since it tends
to amplify the noise along with the signal.

Doug Smith W9WI wrote:
Does the same thing with Ku-band analog. And *doesn't* happen with
C-band digital. (our most critical link at work is Ku-band digital; we
have a C-band digital hot standby)

Why operate within Ku-band at all, if the C-band link is more reliable?

--
Now Playing: something else

Brenda Ann Dyer wrote:

"Telamon" wrote in message
...
Rain is not the only problem for satellites. How about when they line up
with the Sun? Doesn't that also cause problems?


Indeed it does... and this is one of the times of the year that this happens
in the northern hemisphere. It also affects uplinks, though not so badly.
Having a larger dish doesn't necessarily help in this case, since it tends
to amplify the noise along with the signal.

Since geosyncronous satellites are located in relatively stationary
orbits above the equator, solar interference can only happen when the
position of the sun is also near the (celestial) equator. This happens
near the equinoxes in March and September. The sun is currently nearing
the June solstice point (+23/deg above the equator) which puts it well
above the apparent positions of geosyncronous satellites.


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Telamon wrote:
Rain is not the only problem for satellites. How about when they line up
with the Sun? Doesn't that also cause problems?

True. That's not unique to Ku-band; it happens at C-band too. (and of
course both analog and digital)
--
Doug Smith W9WI
Pleasant View (Nashville), TN EM66
http://www.w9wi.com

craigm wrote:
Look at the size of the dishes to answer your question.

Why operate within Ku-band at all, if the C-band link is more reliable?

Well, not really, because our Ku-band dish is the same size as the C-band...

My understanding is that Ku-band transponder rental is cheaper. One
C-band feed backs up several different Ku feeds.
--
Doug Smith W9WI
Pleasant View (Nashville), TN EM66
http://www.w9wi.com