Signal-To-Noise Ratio (Snr) And Automatic Gain Control (Agc) − − − − Osd Only; D 04: Audio/Video Status - Motorola DCP501 Installation Manual

D-12 Diagnostics
Signal-To-Noise Ratio (SNR) and Automatic Gain Control (AGC) − − − − OSD Only
The SNR displayed on the on-screen display is a rough estimate of the carrier signal-to-noise
ratio. The SNR displayed is a measure of the QAM cluster variance, which is proportional to the
signal-to-noise ratio.
The AGC value roughly indicates the received signal level.
Analog channels display analog for carrier lock. The SNR and AGC display a number for the
numeric value and blank for the ssss value.
A blank display indicates that the digital section of the DCP501 is still in the initial state. If this
occurs, check diagnostic d07.
Table D-9 lists the SNR and AGC indicators for the on-screen display:
Table D-9
SNR and AGC indicators − − − − OSD only
ssss value Meaning
GOOD Good value
FAIR Marginal signal level − check the signal
BAD Unusable signal

D 04: Audio/Video Status

This diagnostic displays the audio and video information for the current tuned channel.
Figure D-8
Audio/Video status - OSD
04 AUDIO/VIDEO STATUS
ADP
Audio Mode
Audio SPDIF
SAP
VP
VIDEO MUTE
MPEG Method
MPEG Muting Mode
ADP Lock:
Audio Mode:
Audio SPDIF:
SAP:
VP Lock:
MPEG Method:
DCP501 Installation Manual
YES
(MONO, STEREO, SURROUND)
NONE, IEC958_PCM, AC3*)
(YES/NO)
YES
MUTE BLACK
* will display speaker combination.
Audio processor locked status
Audio modes
SPDIF modes
Second audio program status
Video processor locked status
MPEG method selection
LFE 0