Paradise Datacom 4 RU Chassis, Руководство по эксплуатации

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4 RU SSPA Chassis Operations Manual 201627 REV X 63
switchover from a faulted SSPA, but rather will keep the selected SSPA online,
regardless of its state.
Note: In order to function normally, both SSPAs must utilize the same
switching mode.
4.2.4 Physically rotating transfer switch
It is possible to physically rotate the shaft on the transfer switch to change the online
and standby amplifiers positions. This can be done either in manual or automatic
mode. When the switch is physically rotated in automatic mode the online SSPA will
attempt to return the switch to its previous position. The SSPA will make two attempts
to return the switch before accepting the new position.
4.2.5 Switchover Muting
The following option was introduced into the SSPA control setup to overcome a
problem with microwave arcing, which may potentially damage a switching component
if the switching RF power exceeds 400 Watts. This particular problem becomes a
critical issue if coaxial RF pass switches are used.
In general, all Teledyne Paradise Datacom SSPAs are well protected against high
reflected power conditions, which may take place during output microwave switchover.
However, waveguide or coaxial switches will develop an internal electrical arc during
switchover if the output power is significant. Such conditions will not lead to instant
failure, but over time may diminish some critical RF switch characteristics.
If such an option is turned on, the system ability to output RF power will be bonded to
the switch position sensing circuitry. Such circuitry consists of the following
components: SSPA electronic switch position detector; wiring harness between SSPA
and RF switch; RF switch position sensors. Failure of any of these components will
lead to a break in transmission. Paradise Datacom LLC strongly recommends to NOT
turn on this option unless absolutely necessary.
To enable switchover muting from the SSPA Front Panel:
1. Press the Main Menu Key;
2. Select item “4.Flt.Setup” and press the “Enter” Key;
3. Select item “3.RF Switch” and press the “Enter” Key;
4. Select item “4.MutedSwitch” and press the “Enter” Key