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Legend
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154 Posts
Discussion Starter · #1 ·
I've got a significant problem with rainfade at my house. The weird thing is that all of my signal strengths are in the 98ish range, but still I'll get rainfade even when it isn't raining very hard at all.

I'm just guessing here, but is it possible that the SWIM is doing the automatic gain control thing and is throwing off the numbers?
 

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Mentor
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Big summer time thunder boomers or cloud cover alone affects this in the summer time, not so much of a problem in winter months or late fall early spring, plus we had giant solar flares this week too ,just look a the northen lights they a spectacular.
 

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Dad
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6,606 Posts
Make sure your 98 readings are from the 99c, 103ca and 103cb sat screens. 98 is high for these SATS, but all those readings should be 90+. Those are the HD SATS and go down before the SD SATS.

If you are not 90 or above on a good weather day, you need a dish alignment.
 

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Mr. FixAnything
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Combat Medic said:
I've got a significant problem with rainfade at my house. The weird thing is that all of my signal strengths are in the 98ish range, but still I'll get rainfade even when it isn't raining very hard at all.

I'm just guessing here, but is it possible that the SWIM is doing the automatic gain control thing and is throwing off the numbers?
The numbers on your TV screen (signal level) are SNR, not a level [dB/dBmV/dBuv]. So gain of the amplifier/switch with it will not affect reading not to increase values for sure.
 

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Super Moderator
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P Smith said:
The numbers on your TV screen (signal level) are SNR, not a level [dB/dBmV/dBuv]. So gain of the amplifier/switch with it will not affect reading not to increase values for sure.
You're correct, but the wording might be better:
The TV screen numbers come from the SNR [or CNR], which is measured in dB, but displayed as a percentage.
The SNR isn't affected by loss or gain from the LNB to the receiver, and would only be when the loss is so great that it would be well below the receiver's minimum level.
 

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Legend
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Discussion Starter · #6 ·
veryoldschool said:
You're correct, but the wording might be better:
The TV screen numbers come from the SNR [or CNR], which is measured in dB, but displayed as a percentage.
The SNR isn't affected by loss or gain from the LNB to the receiver, and would only be when the loss is so great that it would be well below the receiver's minimum level.
That makes perfect sense. Thank you.
 

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As Tiny implied, it is the total amount of water in the path from the satellite to your dish that causes rain fade. It might not be raining at all at your house, but there still could be significant cloud cover in the LOS. We had some thunderheads recently that were more than 55,000 feet high. Clouds that high can be ten miles away from you and still be in the LOS path.
 
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