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Relationship- Signal strength, SNR, AGC

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Old 03-31-2008, 02:07 PM   #1
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Default Relationship- Signal strength, SNR, AGC

Can someone help me understand how I am doing with these three numbers as measured by my Sony. These are OTA. My mid -quality stations are on average reading, signal strength 83, SNR, signal to noise ratio 21, and AGC, automatic gain control 108. Are there clues in these numbers as how to improve the stability of my reception? Thanks, Walter
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Old 04-01-2008, 09:09 AM   #2
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That entirely depends on what they are measuring. Generally speaking, SINAD is measured in dB and Received Signal Strength in -dBm. In the process of trying to make things easier to understand, it would appear manufacturers confuse the issues. I would guess that the signal strength on your set is out of 100, with 100 equal to some pre-set -dBm level that would provide perfect, or probably better than perfect, reception. The SNR is a ratio in dB (guess) with about 30dB being the maximum you'd ever see. As to how many dB you need for a perfect raster/soundtrack, guessing about 15. Hope this helps!
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Old 04-02-2008, 03:24 PM   #3
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Blackduck,

I have a Sony KDL-40v2500 and receive stations from 20 to 85 miles away. I have found the higher my SNR is to the AGC level, the more stable the signal will be. There is also a percentage bar, but I ignore that.

Here are some of my stations, distance, SNR/AGC, and reception notes:

KLTV 20mi 30/50 Perfect quality without drop outs or pixelation.
KTBS 85mi 25/60 Perfect quality with rare freezes.
KSLA 85mi 17/65 Perfect quality with occasional freezes and
pixelation. Rare drop outs.
KTAL 85mi 16/70 Regular drop outs.

15/70 seems to be the threshold for reception, with 17/65 for reliable
viewing.
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Old 04-03-2008, 06:54 AM   #4
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I have a Sony 52 LCD BR4. I can not find a OTA signal strength meter on this set. Does it have one?
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Old 04-03-2008, 12:34 PM   #5
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Have you looked in the manual?
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Old 04-03-2008, 01:57 PM   #6
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Quote:
Originally Posted by nascarhawk View Post
I have a Sony 52 LCD BR4. I can not find a OTA signal strength meter on this set. Does it have one?
It's on the "Diagnostics" menu and its only active if you are tuned to a digital channel.

Unless Sony has changed the menu structure, the "Diagnostics" menu is a sub-menu of the "Advanced" menu. Just press on the "Menu" button on your remote.
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