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Old 12-Jan-2018, 8:43 PM   #9
Retired A/V Tech
Join Date: Aug 2012
Location: S.E. VA
Posts: 2,738
Originally Posted by Sev View Post
I also recently bought a Silicondust unit. One of the most recent models.
HDHR5. So far it has proven itself not to have a tuner the equal of my avermedia stick or the one in the TV.
A bit disappointing.
I am wondering though if it could be a faulty unit.
That unit is probably not faulty, but the design is faulty. The problem is with the internal splitter which makes the system noise figure worse. This raises the noise floor that reduces the SNR of the weakest signals. IOW, it isn't as sensitive for weak signals.

The original HDHR with two tuners had a separate antenna input for each tuner:

That was the best way to design a dual tuner HDHR; it is still needed now with multiple antenna systems:

The present dual and quad tuners use an internal 2-way or 4-way splitter. There is an internal amp to make up for the signal loss in splitting, but the damage to the System Noise Figure still exists and can not be undone.

Some users have more than one HDHR connected to a network for a multiple antenna system to avoid the internal splitting.
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Last edited by rabbit73; 12-Jan-2018 at 8:56 PM.
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