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I checked the signal strength for Channel 107 (BBC News HD) tonight as this is my weakest (CH55 – COM7) and it was on Tuner 3, due to some recordings on 1 & 2, at 30% Strength, 100% Quality.
When the same channel is on Tuners 1 & 2 it sits at 50% Strength, 100% Quality. I checked some other channels and all reported a 20% loss in signal strength on Tuner 3.
I have a signal attenuator which reduces the signals for the strongest channels (BBC HD) from 99% to 75% which fixed constant No Signal problems in recordings. The attenuator (SAC Attenuator) is located between the 5000T and the wall plate.
I’m wondering if this is normal behaviour for Tuner 3 or is there another reason for the 20% signal loss?
Many Thanks
Had a look at this to see if there is some internal attenuation involved in splitting the signal to the 3 tuners.
A 3 way passive split would reduce the signal strength by approx 6dB.
I tuned to the 3 different mux with no recordings to get a measurement with no recordings.
BBC 1 HD Strength 90% Quality 100%
BBC 1 SD Strength 85% Quality 100%
ITV 1 SD Strength 84% Quality 100%
Started a recording on ITV 1 SD (Tuner 1)
Switched to BBC 1 SD started second recording (Tuner 2)
Switched to BBC 1 HD started 3rd recording (Tuner 3).
The two SD channels (Tuner 1 and 2) showed same figures, tuner 3 (BBC 1 HD Signal strength up from 95% to 100%, quality still at 100%.
As expected there is a small gain amp to recover splitting losses.
Perhaps try increasing the strongest mux to around 90%.
davidrew – 15 hours ago »
I checked the signal strength … on Tuner 3 … at 30% Strength, 100% Quality.
When the same channel is on Tuners 1 & 2 it sits at 50% Strength, 100% Quality.
Strength is pretty irrelevant – the important thing is Signal Quality and you are getting 100%.
Don’t worry.
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