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POWER AMPLIFIER controlled by local PA port of SMD (local PA type)
Complementary to uLINK DATA control, Power
Amplifier can be controlled also directly from the
SMD local PA port. Local PA port provides dual
band data outputs (BCD and CI-V) and can be
chained with local serial port providing a band
data over proprietary protocol (Acom 2000).
Unlike PA controlled by uLINK DATA module,
amplifier connected to local PA port can be used
by only the radio/SMD to which it is physically
connected. The PA cannot be shared by other
stations and must be placed in an antenna path
which can have only one dedicated user – usually
behind the interfaced radio or BPF.
There are several parameters for setting up such
Power Amplifier control:
CONTROL BOX
•
Specifies which control box will be used for this PA. The only valid choice is "local PA". The SMD is
selected by its unique address specified at Control Boxes tab.
CI-V port settings
•
These settings are the same as those for uLINK DATA modules.
Band Plan
•
Specifies frequency/BCD code table. Table is fully editable, separate frequency ranges can be added or
removed by Insert band and Remove Band buttons or altered by single click on selected frequency
display in the list. BCD code for each band can be set independently by clicking on selected line. Table
can be set to default values according to regional band map by clicking on Default bands button. Out of
bands defines the BCD outputs if control frequency is out of defined frequency ranges. When "If
frequency is out of bands set fixed value" is not selected, the control box will keep last used outputs
until a frequency closer to another "band" segment is selected.
KeyOut column specifies if generation of KEYOUT signal is allowed for selected frequency range.
Similarly, PA On column specifies if PA can be turned ON at selected frequency range. Function of
KEYOUT and PAON signal is fixed to specific, equally named pins on PA port
NOTE: Band Map for local PA control is always fixed to TX frequency.
Inputs and Outputs
•
These controls set the behavior of local PA port KEYIN and KEYOUT signals.
Use KeyIn should be checked if the Power Amplifier provides keying output signal connected to KEYIN
input on PA port. Polarity of this signal can be inverted clicking the Invert KeyIn checkbox. KeyIn
timeout field specifies maximum time KEYIN can lag the generation of KEYOUT. Error states and error
handling are the same as those for KEYIN signal on uLINK DATA module.
Inhibit lead specifies fixed T-R switching time for the PA if it does not provide a KEYIN signal. During
this time SMD generates INHIBIT signal for transceiver which prevents generation of RF power out from
the radio.
NOTE: Inhibit lead time should be zero (0) if the amplifier provides KEYIN signal and it is connected to
PA port.
KeyOut Tail specifies tail time of KEYOUT signal, additional delay at the end of each T-R cycle.
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