COM-3005 800 - 1000 MHz receiver -> Multi-path simulator COM-1024 -> Dual D/A converter COM-2001

The baseline configuration in the 3005_1024_2001.stn settings file is as follows:
800 MHz center frequency
100 KHz synthesizer frequency step.
External 10 MHz frequency reference.
-56 dBm input level threshold for full scale 10-bit A/D conversion.
External PLL-STROBE frequency hopping signal disabled.
Multi-path: 
one path with no frequency offset, no delay, no attenuation (Initially enabled)
another path with 100 KHz frequency offset and -10 dB attenuation, no delay (initially disabled)

Purpose: test the RF receiver module in presence of an input sinewave. 
Check the multipath simulator.
Convert the multi-path signal back to analog.

(a) Connect an external 10 MHz frequency reference 
(generally available from a spectrum analyzer or RF signal generator) 
to the COM-3005 10 MHz input port.

(b) Turn the power supply on. Import the 3005_1024_2001.stn setting file into the assembly 
(from the ComBlock Control Center  File | Import menu).

(c) connect an RF frequency generator to the RF-IN input. 
Set the frequency to 800 MHz, level -56 dBm. 
Note 1: as the COM-1024 is not designed to control AGC, any input signal level above -56 dBm
may cause saturation.

(d) using an oscilloscope, verify that test points TP1 and TP2 on the COM-4005 receiver are 
low-frequency sinewaves of amplitude approximately 0.6 to 1Vpp.
The sinewaves represent the frequency difference between the RF signal generator 
and the COM-3005 external frequency reference.
Note 2: if the same frequency reference is used for the COM-3005 and the external RF signal
generator, the voltages at TP1 and TP2 may be fixed (zero frequency error).

(e) using an oscilloscope, verify that the COM-2001 outputs comprise one near-zero frequency
signal which is identical to the input one (visible at COM-3005 TP1 and TP2).


(e) Enable 2nd path: Set COM-1024 registers REG2/3 to F4 50 (-10 dB). 
Disable 1st path: Set COM-1024 registers REG0/1 to 00 00 (full attenuation).
Verify that the COM-2001 outputs  comprise one carrier at 100 KHz
with 10 dB relative attenuation.