QPSK modulator COM-1002 -> Dual D/A converter COM-2001 -> L-band modulator COM-4002

This test setup demonstrate the ability to tune to the two extreme frequencies: 950 MHz
and 1.450 GHz. 
The COM-1002 is only used as a digital sinewave generator. 

(a) import the 1002_2001_4002.stn settings into the assembly.

(b) using an oscilloscope, probe the COM-2001 I and Q outputs. The capacitors C3 and C24
are convenient test points. The signals should be 39.062 KHz sinewaves, with amplitude
of 1Vpp.

(c) using a spectrum analyzer, check the COM-4002 output.
The output is an unmodulated carrier at 1.450 GHz. The level is -8 dBm or above.
LO leakage is -29 dBm typ.
Image rejection for the entire assembly is -35 dB typ.

(d) Frequency tuning range:
Using the ComBlock Control Center, change the REG0/1/2/3 to the following values and observe
the following spectrum outputs:
REG0/1/2/3: 80 D9 9F 38   950 MHz
REG0/1/2/3: 80 3E 6D 56   1450 MHz
For every frequency, check that the SYNC_LOCK test point is low, indicating frequency
synthesizer lock.

(e) Transmit level:
Set REG4/5 from FF 03 (maximum gain) to 00 00 (minimum gain)
Output level should be 

(f) Internal frequency reference:
Switch to internal frequency reference by setting REG6 to 04
Remove the 10 MHz external frequency reference.
You may have to switch the assembly power off and then on again.
Re-do step (d). 
For every frequency, check that the SYNC_LOCK test point is low, indicating frequency
synthesizer lock.