XSAT7080 X-Band Transceiver
Revision 0
Maintenance and Troubleshooting MN/XSAT7080.IOM
7–2
7.1 M
AINTENANCE
T
ESTING
Use the instructions in
the
applicable appendix for installing the transceiver for checkout, and the
procedures in
Chapter 3
, for operating the transceiver.
Step
Procedures
1
The transceiver contains an Upconverter, a Solid-State Power Amplifier (SSPA) and a
Downconverter.
2
The Upconverter translates the IF input frequency of 52 to 88 MHz to an RF
frequency of 7900 to 8400 MHz depending on the setting for the output frequency.
3
The IF input level is -20 to -30 dBm (typical). The signal is then amplified by the 25
Watt SSPA to the desired output level (
≥
+44 dBm at 1 dB compression).
4
The Downconverter translates the RF input signal down to the IF output frequency of
52 to 88 MHz.
5
The RF input level is -45 dBm (typical), and the IF output level is +13 dBm at 1 dB
compression.
7.2 T
ROUBLESHOOTING
Transceiver operating problems can be identified by first observing the status indicators through
the Communications port. When a fault condition is indicated, using the Retrieve Alarm Status
(RAS) command can identify the specific fault, or faults. The status of all transceiver functions
will be displayed as described in Chapter 5 (see the Retrieve Alarm Status commands).
7.3 C
ONVERTER
F
AULTS
Check the Alarm Status
for possible faults, or an indication of a marginal performance
tolerance condition.
7.3.1 DC P
OWER
S
UPPLY
V
OLTAGES
24 VDC
10 VDC
20 VDC
P5 VDC (+5 VDC)
12 VDC
N5 VDC (-5 VDC)
A fault ("FT") indicates a voltage level exceeding
±
10% of the power supply voltage. If the
voltage exceeds
±
10%, contact Comtech EF Data.
