My primary interest is in measuring signal strength and signal quality of DTV signals, so I wanted see what the Roamio Diagnostics Screen looked like.
I downloaded the Roamio user manual, but I didn't seen any screen shots:
http://assets.tivo.com/assets/resour..._19AUG2013.pdf
I then did a Google search:
https://www.google.com/?gws_rd=ssl#q=TiVo+Roamio+SNR
This is for cable, but I think OTA is similar
Troubleshooting Digital Cable Signals (BOLT, Roamio, Premiere, Series3)
Checking signal lock and signal strength
1. Navigate to the Signal Strength-Cable screen:
From TiVo Central > Settings & Messages > Settings > Channels > Signal Strength-Cable
2. Press Select to display the Signal Strength Meter. A warning screen appears, telling you that using the Signal Strength Meter will stop all recordings.
3. Select OK, access this setting. The signals strength meter appears.
Checking the signal quality
1. Tune to a channel that is having a problem.
2. Write down the channel number and then press RECORD to lock the tuner to the channel (Series3 only: If two CableCARDs are installed, this also locks the tuner to the CableCARD).
3. Navigate to the DVR Diagnostics screen:
From TiVo Central > Settings & Messages > Account & System Info > DVR Diagnostics
4. Under Tuner 0, look at the channel number. If the channel listed is not the problem channel, press Chan Down until you see the information for Tuner 1 (if you have a 4- or 6-tuner TiVo DVR, you might need to continue scrolling until you reach the correct tuner for the problem channel).
and found this document from TiVo: (link no longer available, do Google search)
Troubleshooting Digital Cable Signals: Roamio Series, Premiere Series, and Series3 DVRs
http://support.tivo.com/app/answers/detail/a_id/150
It had some images for the Diagnostics Screen. I copied the one for the errors, and edited it to make it a little lighter because the original was too dark:
RS is short for Reed–Solomon:
https://www.google.com/?gws_rd=ssl#q=RS+errors
http://en.wikipedia.org/wiki/Reed%E2...ror_correction