African Satellite World and Sat Gear

[Let Love Reign]

The disease is slowly spreading!
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[Mnyash]

Looking for openbox v8 remote. Anyone having or knows how I can get? Will really appreciate.

GIDEN tokea....

 

[Mnyash]

The disease is slowly spreading!
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Hivyo iliyo na alama ya kujumulisha ni moto eh, haidukuliki?

 

[wildfish]

Hivyo iliyo na alama ya kujumulisha ni moto eh, haidukuliki?

Mnazipata kwenye nyuzi ngapi?

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[Let Love Reign]

Hivyo iliyo na alama ya kujumulisha ni moto eh, haidukuliki?

Imeanza sumbua west. (Latin america). Asa imeingia east.
Hope mchina will keep up with it.

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[X-PONDER]

The disease is slowly spreading!
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Stardust 247

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[Kijana One]

Somebody try this @57e. Good movie channels

 

[freq]

Somebody try this @57e. Good movie channels

With mchele quality​

 

[Mfetra]

Guys, is a 6 ft offset better than 6ft pf? that is for same size is offset always a better performer than pf? i think its good time we revisited this issue.

 

[freq]

Guys, is a 6 ft offset better than 6ft pf? that is for same size is offset always a better performer than pf? i think its good time we revisited this issue.

I've researched on what makes offset dishes better than pf dishes and come to think and read about it;

Think of someone shinning a torch at a wall at night... There are two ways you can do it..

One; point it directly and perpendicularly to the wall... You'll find a relatively small Perfectly Round area of illumination... If the torch is your satellite, light is your radio signal from the satellite and the wall is your dish pointing directly at the satellite (like a pf dish does). Your dish will gather relatively small amount of radio waves while pointed directly at the sat due to the small rounded area of illumination..

Scenario Two; You are pointing your torch at the wall but now at an angle say 30 degrees to the wall. You'll see the area of illumination on the wall is larger and Oval. (Like an offset dish)... So if the torch is your satellite radiating radio waves as light in this case, placing an oval dish to look at it at an angle will maximize the area of illumination, thus gathering more "light". More collection means better performance.

Of course in real world we cannot make the torch which represents our satellite to look at our dish or "wall" at an angle. What we do is tilt our "wall" or dish to look at the "torch" or satellite at an angle Called the offset angle.

Thus the birth of offset dishes which should perform better than their pf counterparts.

 

[Mnyash]

Imeanza sumbua west. (Latin america). Asa imeingia east.
Hope mchina will keep up with it.

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Haya basi, yahuzunisha lakini. Kama kawaida, mpe muda tu!

 

[Kamathig]

I've researched on what makes offset dishes better than pf dishes and come to think and read about it;

Think of someone shinning a torch at a wall at night... There are two ways you can do it..

One; point it directly and perpendicularly to the wall... You'll find a relatively small Perfectly Round area of illumination... If the torch is your satellite, light is your radio signal from the satellite and the wall is your dish pointing directly at the satellite (like a pf dish does). Your dish will gather relatively small amount of radio waves while pointed directly at the sat due to the small rounded area of illumination..

Scenario Two; You are pointing your torch at the wall but now at an angle say 30 degrees to the wall. You'll see the area of illumination on the wall is larger and Oval. (Like an offset dish)... So if the torch is your satellite radiating radio waves as light in this case, placing an oval dish to look at it at an angle will maximize the area of illumination, thus gathering more "light". More collection means better performance.

Of course in real world we cannot make the torch which represents our satellite to look at our dish or "wall" at an angle. What we do is tilt our "wall" or dish to look at the "torch" or satellite at an angle Called the offset angle.

Thus the birth of offset dishes which should perform better than their pf counterparts.

Well explained Freq!!!!

 

[freq]

Well explained Freq!!!!

Thank you

 

[Lunsat2]

I've researched on what makes offset dishes better than pf dishes and come to think and read about it;

Think of someone shinning a torch at a wall at night... There are two ways you can do it..

One; point it directly and perpendicularly to the wall... You'll find a relatively small Perfectly Round area of illumination... If the torch is your satellite, light is your radio signal from the satellite and the wall is your dish pointing directly at the satellite (like a pf dish does). Your dish will gather relatively small amount of radio waves while pointed directly at the sat due to the small rounded area of illumination..

Scenario Two; You are pointing your torch at the wall but now at an angle say 30 degrees to the wall. You'll see the area of illumination on the wall is larger and Oval. (Like an offset dish)... So if the torch is your satellite radiating radio waves as light in this case, placing an oval dish to look at it at an angle will maximize the area of illumination, thus gathering more "light". More collection means better performance.

Of course in real world we cannot make the torch which represents our satellite to look at our dish or "wall" at an angle. What we do is tilt our "wall" or dish to look at the "torch" or satellite at an angle Called the offset angle.

Thus the birth of offset dishes which should perform better than their pf counterparts.

Ummm,

I've researched on what makes offset dishes better than pf dishes and come to think and read about it;

Think of someone shinning a torch at a wall at night... There are two ways you can do it..

One; point it directly and perpendicularly to the wall... You'll find a relatively small Perfectly Round area of illumination... If the torch is your satellite, light is your radio signal from the satellite and the wall is your dish pointing directly at the satellite (like a pf dish does). Your dish will gather relatively small amount of radio waves while pointed directly at the sat due to the small rounded area of illumination..

Scenario Two; You are pointing your torch at the wall but now at an angle say 30 degrees to the wall. You'll see the area of illumination on the wall is larger and Oval. (Like an offset dish)... So if the torch is your satellite radiating radio waves as light in this case, placing an oval dish to look at it at an angle will maximize the area of illumination, thus gathering more "light". More collection means better performance.

Of course in real world we cannot make the torch which represents our satellite to look at our dish or "wall" at an angle. What we do is tilt our "wall" or dish to look at the "torch" or satellite at an angle Called the offset angle.

Thus the birth of offset dishes which should perform better than their pf counterparts.

Ummm, I am not convince. The oval illumination on the wall is measurably of a larger surface area than the circular illumination. But for dishes we are talking of same dimensions. The question remains why should one shape gather more signal than a different shape of equivalent surface area? To me the offset should actually collect less signal than prime focus. Don't laugh yet. Imagine a beam of parallel rays of light. Imagine three mirrors of same size lying in the path of this beam, one at 90 degree, one at 45 degrees and one at zero degrees. Which one will reflect more light?

 

[freq]

Imagine a beam of parallel rays of light. Imagine three mirrors of same size lying in the path of this beam, one at 90 degree, one at 45 degrees and one at zero degrees. Which one will reflect more light?

you see there's a specific angle you must set your dish to collect most signal. The optimum angle You don't just tilt it t any angle. The optimum tilting Angle is depends on the manufacturer. Depending on dish size etc. Eg. 22° . Meaning if you're aiming at 7w, point at 7w but tilt your dish by 22,° for maximum gain... Too much tilting and you miss it for that particular model of dish

so if you're setting your "mirror" which in our case is the dish at zero degrees tilt instead of 45. You're doing it wrong. Its like trying to find nilesat while pointing your dish at azam position.

 

[freq]

But for dishes we are talking of same dimensions.

Nope oval offset dishes are larger by surface area.. a 120cm offset measures 120cm on one side and 135cm on the longer side... If it were a pf dish, it would have a 120cm.diameter all round

 

[freq]

Ummm,


Ummm, I am not convince. The oval illumination on the wall is measurably of a larger surface area than the circular illumination. But for dishes we are talking of same dimensions. The question remains why should one shape gather more signal than a different shape of equivalent surface area? To me the offset should actually collect less signal than prime focus. Don't laugh yet. Imagine a beam of parallel rays of light. Imagine three mirrors of same size lying in the path of this beam, one at 90 degree, one at 45 degrees and one at zero degrees. Which one will reflect more light?

Think of it in terms of area of illumination

Again imagine reading a book using a small phone torch at night... If you point directly at the book at 90, deg. You'll have a very small area illuminated for you to read. But if you tilt your torch or your book. You'll see a wider section of the page.

Because the book is reflecting more.light into your eyes...

By the way your eyes is the LNB in this case. Your brain is the decoder.

The signal could be encrypted if the text you're reading is Arabic and your brain can't decode it.

 

[Lunsat2]

Nope oval offset dishes are larger by surface area.. a 120cm offset measures 120cm on one side and 135cm on the longer side... If it were a pf dish, it would have a 120cm.diameter all round

If the offset is bigger in surface area in addition to the lnb not obstructing signal I get the difference in gain.

 

[Lunsat2]

you see there's a specific angle you must set your dish to collect most signal. The optimum angle You don't just tilt it t any angle. The optimum tilting Angle is depends on the manufacturer. Depending on dish size etc. Eg. 22° . Meaning if you're aiming at 7w, point at 7w but tilt your dish by 22,° for maximum gain... Too much tilting and you miss it for that particular model of dish

so if you're setting your "mirror" which in our case is the dish at zero degrees tilt instead of 45. You're doing it wrong. Its like trying to find nilesat while pointing your dish at azam position.

Freq, do a simple experiment. Get a school note book with lines and select say five lines. These are your signal lines. Draw a line across them at 90 degrees from the bottom line to the top line. That's your PF dish. Now draw another line of same length at any degree angle you deem optimal. Thats your Offset dish. Comeback and tell me which one is crossing more signal lines. You can't get more signal without increasing the dish size. Infact the dish has to be bigger to get the same signal the greater the offset angle.

 

[freq]

If the offset is bigger in surface area in addition to the lnb not obstructing signal I get the difference in gain.

Freq, do a simple experiment. Get a school note book with lines and select say five lines. These are your signal lines. Draw a line across them at 90 degrees from the bottom line to the top line. That's your PF dish. Now draw another line of same length at any degree angle you deem optimal. Thats your Offset dish. Comeback and tell me which one is crossing more signal lines. You can't get more signal without increasing the dish size. Infact the dish has to be bigger to get the same signal the greater the offset angle.

Sorry I didn't get it..

Think in three dimension.

If the offset is bigger in surface area in addition to the lnb not obstructing signal I get the difference in gain.

Yes.. the whole point is offsets achieve larger reflecting/illuminated surface area without unnecessary bulkiness... Thus more efficient.

The extra size is added at the exact part its needed.. not all round.

Offset dishes also avoid assembly errors because it comes in few; normally as a single ir two pieces. so there are fewer installation imperfections

Then there's ground noise that's caused by lnb looking at the ground especially for near horizon satellites... In an offset dish, the lnb will actually look upwards if trained at a sat near horizon thus avoiding ground noise.. this could be an advantage if you're hunting measat in Kenya for example

It's a big issue in mzungu countries where the equator (home of satellites) is always near horizon. Thus ground noise is a big issue while hunting.

And there's the issue of lnb blocking the signal which offset dish eliminates