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Old 25-Jan-2021, 3:21 AM   #1
rabbit73
Retired A/V Tech
 
Join Date: Aug 2012
Location: S.E. VA
Posts: 2,732
TV SNR and Mediasonic HW150 Signal Quality Comparison

TV SNR and Mediasonic HW150 Signal Quality Comparison

Knowing the SNR or signal quality of an OTA channel can be very helpful when comparing antennas or finding the best antenna location.

Since many TVs don't show SNR or signal quality, I did a comparison between SNR on my SONY TV and Signal Quality on the Mediasonic-HW-150.

Code:
TV SNR and Mediasonic HW150 Signal Quality Comparison

Channel 16 signal power with no attenuation:
 +3.3 dBmV (-47.5 dBm)

Attenuation   SONY SNR   Mediasonic HW150

NONE           31 dB           83%
30dB           24 dB           61%
30dB+Var       17 dB          42-43%
30dB+Var       16 dB           41%
30dB+Var       15 dB           39%
30dB+Var      14-15 dB        0-38%
30dB+Var       14 dB           0%  Severe pixelation
Variable attenuation was increased for desired SNR.

SETUP:
Ant > preamp 17dB > attenuator > 4-way splitter for:
1. SONY KDL-40R350D
2. Mediasonic HW150
3. Sadelco DisplayMax 800 Signal Level Meter
4. Airspy R2 SDR with Spectrum Spy software for
spectrum screenshots made at SNR 31, 24, and 15 dB

Other equipment used:
Channel Master 7777HD Preamp, at Low 17 dB
4-way splitter
10 dB fixed attenuator
20 dB fixed attenuator
0-20 dB Toner variable attenuator

CODE data above saved as image:



Here are the screenshots of the CH16 signal at SNR 31, 24, and 15 dB:







This is a screenshot of the Mediasonic HW150 for CH20 at the "Digital Cliff."



The Mediasonic HW-150 has a built-in power supply and outputs for HDMI, Component, and Composite. (Composite is also known as CVBS for Composite Video Baseband Signal) The less expensive HW-130 has a separate wall-wart power supply and outputs for HDMI and Composite; no Component output.



Both models are able to add a channel after scan, which is very useful if you have more than one antenna or a rotator. Tyler the Antenna Man uses the HW-130 for antenna comparisons.



https://www.youtube.com/watch?v=YDQzvFG3chs
Attached Images
File Type: jpg TV SNR and HW150 SQ 100pct_1.jpg (147.4 KB, 398 views)
File Type: jpg TV SNR and HW150 SQ 80pct_1.jpg (104.4 KB, 412 views)
File Type: jpg TV SNR and HW150 SQ 90pct_1.jpg (128.4 KB, 534 views)
File Type: jpg 1-24-2021 CH16 Test1 NoAtt_2.jpg (124.7 KB, 534 views)
File Type: jpg 1-24-2021 CH16 Test2 Att30_2.jpg (120.6 KB, 529 views)
File Type: jpg 1-24-2021 CH16 Test3 Att30andVar_2.jpg (128.8 KB, 529 views)
File Type: jpg MediasonicHW-150 CH20atDigitalCliff_2.jpg (141.9 KB, 536 views)
File Type: jpg Tyler-How to Add Channels_1.jpg (133.8 KB, 825 views)
File Type: jpg Mediasonic HW-150 RearPanel.jpg (106.1 KB, 541 views)
__________________
If you can not measure it, you can not improve it.
Lord Kelvin, 1883
http://www.megalithia.com/elect/aeri...ttpoorman.html

Last edited by rabbit73; 29-Jan-2021 at 2:08 PM.
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