SiliconDust Signal Strength Conversion Chart
3 Attachment(s)
A post by ckwsp101_tv gives a very useful chart that converts SiliconDust Signal Strength % readings to dBmV
https://forum.tvfool.com/showpost.ph...2&postcount=33 Code:
Found on SiliconDust forum http://i.imgur.com/ch7LDqQ.jpg I next bought a meter that read in dBmV which used the 0 to -30 scale. https://forum.tvfool.com/attachment....7&d=1572033639 An then, I had to learn how to use Noise Margin and dBm values that were in TVFool reports: Code:
SiliconDust HDHR Signal Strength Conversion Chart https://www.avsforum.com/forum/25-hd...l#post58705364 Quote:
https://en.wikipedia.org/wiki/Decibel Quote:
Code:
SiliconDust HDHR Signal Strength Conversion Chart This is the Chart5-115 image for comparison with the original code image above: https://forum.tvfool.com/attachment....1&d=1572044127 |
Testing the SiliconDust HDHR4-2US Connect Duo Tuner
4 Attachment(s)
After making the chart above, I started to wonder about the accuracy of the signal strength readings given by the HDHR tuner. I have never used an HDHR tuner, so I ordered an HDHR4-2US Connect Duo to make some tests.
When it came, I connected it to my Windows 7 laptop with a network cable. I went to my.hdhomerun.com which told me there wasn't a tuner connected, so I couldn't immediately download the software. I then went to the SD website and downloaded the software. I still wasn't able to connect until I entered the correct IP address in my network adapter and changed settings in my Norton software. I'm not a software expert, so this was becoming much more difficult than turning on a TV and going into the menu. I set up the tuner and my 32" Sony TV with a splitter so that I could compare tuner sensitivity and signal readings. I picked my strong channel 33 to check the 100% signal strength reading of the HDHR and my marginal channel 9, that has just barely enough SNR above the noise, as test signals. My 32" Sony KDL32R400A is a little different than most other Sony models. Its signal strength indicator goes all the way up to +41 dBmV (-8 dBm) at 100% instead of maxing out at 0 dBmV for 100% as most other TVs. Each step on the scale is one dB and I calibrated it with my signal level meter so that it can be used for tests like this. https://i.imgur.com/USrn73K.jpg I adjusted a step attenuator before the splitter so that the HDHR SS was 100%: HDHR Signal Strength 100%, Signal Quality 98% Sony TV SS 62 (+3 dBmV), SNR 28-29 dB So the HDHR 100% was pretty close to 0 dBmV, considering my measurements aren't lab grade. My marginal channel 9 signal looks like this; just barely enough SNR above the noise: https://i.imgur.com/ffD8rlD.jpg I adjusted the attenuator to make the signal weaker at the "Digital Cliff" to see which tuner would drop out first. To my surprise, the Sony tuner dropped out first; the HDHR tuner is more sensitive than I expected. It was still giving reliable reception at 50% Signal Quality. https://forum.tvfool.com/attachment....1&d=1572747217 At 49% Signal Quality, the Symbol Quality often dropped down into the red at lower readings: https://forum.tvfool.com/attachment....2&d=1572747230 and finally dropout: https://forum.tvfool.com/attachment....3&d=1572747239 |
Hi,
I get similar results with my HD Home Run connect. As long as the signal strength is at least 50% and the SNR is 50% or above (yellow colour) the station is watchable. IF SNR drops below 50% (red) it is unwatchable. My new(ish)Samsung 4K TV UN65MU&000FXZC does have a slightly more sensitive tuner then my HD HomeRun. My old Bell Satellite Box 9242 has a less sensitive tuner. All of these are fed from the same rooftop antenna through a 4 way splitter. Mike |
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