User`s guide

Interpreting Screen Displays
MS-4900, Rev. A 4–3
Table 4-3. Superscreen Fields, Transparent Asynchronous Data
Field: Should be: Meaning:
Character
counter
Incrementing asynchronous data is being received
Carrier lock
status
L = locked on signal if lock is not established (L), or if the
receiver keeps losing its lock, check the
dish alignment
Modulation
type
BPSK or QPSK network setup determines which
modulation type is used; does not vary
Type of data C=characters
Demodulator
Screen Fields
The demodulator screen gives the current tuning status of the receiver. This screen is
meaningful for any mode of operation:
Figure 4-2. Demodulator Screen
Table 4-4. Demodulator Screen Fields
Field Should be: Meaning:
Tuning status Locked Other displays could be Scanning,
Checking, or No Sig Check.
If not locked, check receiver installation
and monitor weather conditions.
AGC voltage At least 100
(as high as possible)
A low AGC voltage often reflects bad
weather conditions. If weather is not the
problem:
• Check dish alignment
• Check LNB connection
• Check length of coaxial cable; install
line amplifiers if length exceeds 500
feet
Eb/No
(signal to noise
ratio)
5.0 dB to 12 dB,
(site dependent)
A low or fluctuating Eb/No reading may
indicate bad weather. If weather is not
the problem:
• Check dish alignment
• Check coaxial cabling
Locked table:xxxxxx
AGC:162 Eb/No= 5.0 dB
Tuning status
AGC relative
voltage
Signal to noise
ratio