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Signal-to-Noise
Ratio
Software (firmware)
Revision Level
MDS 05-3438A01, Rev. F
RSPSupply - 1-888-532-2706 - www.RSPSupply.com
http://www.RSPSupply.com/p-8457-MDS-UP-9790X.aspx
Command Input
SHOW DC
SHOW PWR
SHOW CURRENT
SHOW RADIO
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
command causes the diagnostic port to enter an SNR update
SNR
mode. The
DIAGNOSTIC PORT
roughly a 2 second interval refresh rate. The diagnostic port stays in this
mode until you press the Enter key at the PC.
The
command provides a one-time reading and display of SNR at
SNR!
the diagnostic port.
SREV
displays the software release number, revision and build date:
SREV
0 6 - 3 3 2 1 A 0 1
1 . 0. 0 d d m m m y y y y
MDS 4790/9790 Series I/O Guide
Response
DC IN xx.x V - Power applied to radio
DC OUT x.x V - Regulated output from
U116 (10 V regulator)
RF POWER xx dBm
LNA xxx mA - Current consumption of
LNA
TOTAL xxx mA - Total radio current
B RADIO IS ACTIVE
A RADIO IS [INACTIVE|NOT
EQUIPPED]
S/N Ratio
A
B
Page 78
displays an updated SNR output line at
Software Revision
A
B
Page 78
screen,
screen,
55
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