Documentation about the LO tests

DefaultMode="L3L4" (1300:1800 MHz)

LOmin -> 0

LOmax -> 3000

DefaultLO -> 0

Low pass IF Filter -> 0:1000

Setup

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> receiversSetup=LLP

Test 1: LO below the minimum allowed value

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> setLO=-1 # Target command

Expected: raises ComponentErrors::ComponentErrorsEx

Test 2: LO above the maximum allowed value

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> setLO=3001 # Target command

Expected: raises ComponentErrors::ComponentErrorsEx

Test 3: LO inside the default observed sky band

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> setLO=1500 # Target command

Expected: raises ComponentErrors::ComponentErrorsEx

Expected Message: "LO frequency value not allowed. It is within 

the band and might generate strong aliasing."

Test 4: LO inside the (no-default) observed sky band

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> receiversMode=L1L5 (1625:1715)

> setLO=1500

> setLO=1650 # Target command

Expected: raises ComponentErrors::ComponentErrorsEx

Expected Message: "LO frequency value not allowed. It is within 

the band and might generate strong aliasing."

Test 5: receiversMode after setLO: LO within the band

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> receiversMode=L1L5 (1625:1715)

> setLO=1500 

> receiversMode=L3L4 (1300:1800) # Target command

Expected: raises ComponentErrors::ComponentErrorsEx

Expected Message: "Mode not allowed. The LO value is within 

the band and might generate strong aliasing."

Test 6: bandwidth and start freq (default)

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Expected: bandwidth==500

Expected: start frequency==1300 (1300-0)

Test 7: bandwidth and start freq (NO-default)

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> receiversMode=L1L5 (1625:1715)

> setLO=2300

Expected: bandwidth==90

Expected: start frequency==-675 (1625-2300)

Test 8: low pass IF filter (default)

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> setL0=600 (IF band: 700-1200)

Expected: Bandwidth==300 (700:1000)

Expected: start frequency==700

Test 9: low pass IF filter (NO-default)

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> receiversMode=L1L5 (1625-1715)

> setL0=700 (IF band: 925-1015)

Expected: Bandwidth==75 (925:1000)

Expected: start frequency==925

Test 10: low pass IF filter (NO-default)

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> receiversMode=L1L5 (1625-1715)

> setL0=500 (IF band: 1125-1215) # Target command

Expected: raises ComponentErrors::ComponentErrorsEx

Expected Message: "LO frequency value not allowed. The IF bandwidth

is outside the low pass filter (0-1000MHz)".

.. note:: Maybe we should raise a more specific exception type. For

   instance, a ReceiverErrors::ValidationError. In that case, we have

   to change the implementation of every receiver, because this change

   affects also the K and C band, when checking for the max and min

   values in setLO().