4.2 Theory of Operation

The low gain block up converter has a P1dB of 0dBm. This topology allows the system to be integrated with little impact on the general electrical specifications of the SSPA module.

The converter utilizes single up conversion from L-Band to the desired RF band. The local oscillator circuits are designed to maintain the lowest possible output phase noise. The frequency synthesizer utilizes industry leading technology which allows for phase noise performance previously unattainable in PLL design. Typical phase noise specifications are outlined in Table 4-2.

Table 4-2: BUC RF output phase noise specification

Offset

Guaranteed

C-Band

X-Band

Ku-Band

Ka-Band

Units

Maximum

(Typical)

(Typical)

(Typical)

(Typical)

 

 

10 Hz

-30

-60

-60

-50

-60

dBc/Hz

 

 

 

 

 

 

 

100 Hz

-60

-80

-75

-65

-72

dBc/Hz

1 KHz

-70

-80

-75

-72

-75

dBc/Hz

 

 

 

 

 

 

 

10 KHz

-80

-85

-100

-90

-88

dBc/Hz

100 KHz

-90

-120

-110

-110

-112

dBc/Hz

 

 

 

 

 

 

 

1 MHz

-90

-125

-122

-120

-122

dBc/Hz

 

 

 

 

 

 

 

Band selectivity is accomplished using the most aggressive filtering possible while maintain- ing specified power and spurious performance.

4.3 Smart Reference Technology

Paradise Datacom’s converters come standard with smart reference technology. Smart reference technology allows the system operator to change external system reference frequency without any system configuration required. The converter will automatically sense and lock to any one of the following system reference frequencies: 10 and 50 MHz. With the internal reference option installed the converter will operate with no external reference applied. In the event the system operator wishes to operate on external reference, the converter will automatically sense the presence of an external reference and switch to external reference mode. This setting is configurable in the monitor and control software. See Section 3.3.2 for details.

External reference is applied to the converter via the L-Band input IFL and is routed to the frequency synthesizer using the built-in demux circuitry.

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Paradise RA 5785 manual Theory of Operation, Smart Reference Technology, BUC RF output phase noise specification

RA 5785 specifications

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