ROKU TV TUNER SECRET SCREEN

Over-the-Air signal meter. Available on Roku TV.

ROKU TV TUNER SECRET SCREEN

Great screen tool for optimizing your Over-the-Air indoor/outdoor antenna.  This online screen tool is available on any Roku TV model.

How to enable on a RokuTV:

At homescreen : Press on remote

  • Home 5x
  • UP, Right, Down, UP, Left, Right

To exit:  Select cancel or back arrow on remote.

FAQs:  

Where can I find good explanation of signal factors:  OTADTV

What is a good RSSI? 

TV SIGNAL
Power (dBm)Percent
4 barsStrong-30 to -558 - 100%
3 barsGood-45 to -3033 - 58%
2 barsNormal-55 to -4517 - 33%
1 barsMinimal-65 to -550 - 17%
4 barsLow S/N< -65

source:  otadtv


What is a good BER (Bit Error Rate)? 

While decibels (dBuV) are used to measure the strength of a signal, CBER and VBER are common measures of signal quality often used by installers. CBER indicates the number of errors present before any correction by your TV has taken place. Ideally, CBER should be lower than 2E-2 (2 errors in every 100 bits of data) for good quality reception.VBER is the bit rate error after your TV has identified and corrected error in the transmission channel, the VBER should be lower than 2E-4 (2 errors in every 10,000 bits of data). 

Soure:  Jim's Antenna


What is MER? Modulation error ratio

A high MER value indicates good signal quality. In practice, the MER lies in the range of only a few dB to around 40 dB. A good ATSC transmitter has a MER in the range of approximately 35 dB. When receiving ATSC signals over a roof antenna with gain, a MER of 20 dB to 30 dB would be measurable at the antenna box. Values between 13 dB and 20 dB are expected for portable receivers with a room antenna. At the same time, the MER is the single most important quality parameter for an ATSC transmitter.