MDS 05-3438A01, Rev. F
MDS 4790/9790 Series I/O Guide
55
Signal-to-Noise
Ratio
SNR, SNR!
These commands display the signal-to-noise ratio in dB. GE MDS’ def-
inition of signal-to-noise is based upon the signal level following equal-
ization, for valid data frames only. A valid frame contains no more than
one bit-error, and belongs to a packet addressed for the receiving radio.
SNR is updated and latched for each valid packet received. A filter in
the DSP reduces the effect of any sudden changes in the value.
The output ranges from 10 dB to 33 dB. A value of 10 dB represents a
weak or no signal. A value of 24 dB represents a very strong signal.
The
SNR
command causes the diagnostic port to enter an SNR update
mode. The
DIAGNOSTIC PORT
displays an updated SNR output line at
roughly a 2 second interval refresh rate. The diagnostic port stays in this
mode until you press the Enter key at the PC.
The
SNR!
command provides a one-time reading and display of SNR at
the diagnostic port.
Software (firmware)
Revision Level
SREV
SREV
displays the software release number, revision and build date:
Command Input
Response
SHOW DC
DC IN xx.x V
- Power applied to radio
DC OUT x.x V
- Regulated output from
U116 (10 V regulator)
SHOW PWR
RF POWER xx dBm
SHOW CURRENT
LNA xxx mA
- Current consumption of
LNA
TOTAL xxx mA
- Total radio current
SHOW RADIO
B RADIO IS ACTIVE
A RADIO IS [INACTIVE|NOT
EQUIPPED]
S/N Ratio screen
,
Page 78
A
B
0 6 - 3 3 2 1 A 0 1
1 . 0 . 0 d d m m m y y y y
Software Revision screen
,
Page 78
A
B
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