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L
B
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BUC
O
PTION
B-2
A
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The Local Oscillator reference can be supplied in one of three formats below:
•
Multiplexed Local Oscillator reference frequency on the L-Band signal through the
type N RF input connector.
•
An internal LO reference integrated into the BUC.
•
An external LO reference through a separate BNC connector.
Multiplexed Reference
: Most L-band modems now have a built-in 10 MHz reference. The CPI
BUC can be configured to accept this reference, which is multiplexed with the L-band signal on
the same connector. This is CPI’s standard configuration, and it is recommended for most
applications. The level of 10 MHz should be +5 to -5 dBm at the amplifiers input.
Internal Reference
: An internal 10MHz reference signal with
±
1 ppm stability includes in the
BUC module. This oscillator performance is not as precise as a GPS reference, but it is adequate
for many applications.
External Reference
: This allows the user to connect a system 10 MHz reference through a BNC
cable. This is used for systems that need to slave all amplifiers to a common timing reference,
such as the GPS signal. The level required is +5 to -5 dBm.
Notes:
•
Refer to the Drawing section of the respective Service manual for more information
.
•
Refer to the amplifier specifications in the documents section of this manual for
performance of the amplifier with a BUC.
Precautions:
•
The modulator’s gain should be adjusted for the best signal to noise ratio (-60dBc).
Adding fixed attenuators at the modulators’ output can adjust the power level.
•
A multiplexer should be used rather than a combiner. In case of using a combiner,
band pass filters should be added to modems’ output or a 10 dB fixed attenuator can
be added to each combiner’s input.
•
Please take care to ensure that the proper L-band frequency range is not exceeded or
damage may result.
•
The L-band input signal must be free of the spurious signals that can cause poor
performance or even cause the amplifier to fail.
•
The level of 10 MHz should be +5 to -5 dBm at the amplifiers input.
Summary of Contents for S4UIA
Page 4: ...INDOOR SSPA IV DOC 01040042 REV 6 This page is intentionally left blank...
Page 23: ...UNPACKING INSTALLATION DOC 01040044 REV 6 2 7 Figure 2 1 Connector Locations C band shown...
Page 42: ...INITIAL POWER ON CHECKOUT 4 10 DOC 01040053 REV 6 This page is intentionally left blank...
Page 66: ...OPERATION 5 24 DOC 01040086 REV 7 This page is intentionally left blank...
Page 80: ...SSPA FUNCTIONAL TREE 7 2 DOC 01040089 REV 4 This page is intentionally left blank...
Page 90: ...CUSTOMER WARRANTY AND SUPPORT A 2 APP 01040025 REV 1 This page is intentionally left blank...