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E2730A VXI RF TUNER
SLOT 0
(RESERVED FOR
SLOT 0 DEVICE)
Figure 2-4. E2730A Properly Installed in a Vertical Mainframe
2.7.1 VXI 10 MHz REFERENCE
INSTALLATION
SECURE VXI MOUNTING
SCREWS TO ASSURE
PROPER OPERATION
70 MHz
IF OUT
10 MHz
EXT REF
2ND LO
IN/OUT
1ST LO
IN/OUT
A VXI 10 MHz reference signal is generated within the slot zero controller
and distributed to each tuner via the VXI bus. The VXI 10 MHz reference
is a differential ECL signal, which is available on the CLK10+ and
CLK10- lines. To utilize the VXI 10 MHz reference, each tuner must be
remotely set to the "VXI Bus Reference" mode of operation via the REF
command as explained in Section 3. Optionally, an external 10 MHz
reference signal may be applied to the Slot 0 Controller and then
distributed to each tuner via the VXI bus.
NOTE:
The 10 MHz reference generated within the slot zero controller
generally does not provide sufficient accuracy to meet system
tuning requirements. In most cases the user is advised to apply
an external 10 MHz reference signal to the controller which
may then be distributed to the tuners through the VXI bus.
SLOT 12
99-0088
2-11
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