LAN TCP-IP COM-5001 -> Arbitrary Waveform Generator COM-8001 
-> 70 MHz modulator COM-4004  

Load a file containing in-phase and quadrature sinewave samples (I & Q channels).
Playback the file into a 70 MHz modulator. 
Sample width is 2 (complex) x 14-bit, 1 Msamples/s
The file loaded is a -25 KHz sinewave when played back at 1 Msamples/s.
70 MHz modulator uses internal clock reference.
Check the waveform purity using an oscilloscope and spectrum analyzer.

The ComBlock assembly IP address is configured to be 172.16.1.128
If this IP address does not match your network, edit the 5001_8001_4004.stn file
(change the COM-5001 registers 0-3 [IP address], 4-7 [IP mask] and 8-11 [IP Gateway].

Proper operation can be verified as follows:

(a) connect a serial cable between the host PC and the DB9 connector of the COM-5001
(b) connect a COM-5001 to the LAN. 
(c) connect a coaxial cables between the COM-4004 output and a spectrum analyzer.
(d) import the 5001_8001_4004 configuration file
(e) using the ComBlock Control Center Functions | Pattern Generator, 
upload the file "formatted_samples_for_com4004.bin" (same directory as the 5001_8001_4004.stn settings file).
The file contains 2x14-bit complex samples packed in binary form. 
Upload file format: binary.
Start upload address: 0
Upload window length option: Entire upload file

Select Action = Start Upload. Then Apply.

The menu should show a quick progress bar, then indicate upload completion with 1120 bytes uploaded.

(f) using the ComBlock Control Center Functions | Pattern Generator, 
download the file. 
Start download address: 0 (dec)
Download window length: 1120 (dec)
Output flow: Data pushed
Download speed: 2000000  (1M complex samples per second) 
Output pinout option: COM-4004 ComBlock
Output width: 14
Clock: Internal

Select Action = Start continuous download. Then Apply.

Use a spectrum analyzer set at 70 MHz center frequency.
Observe the synthesized sinewave at -25 KHz + crystal oscillator frequency offset 
(50 ppm max = 3.5 KHz)
Spectral purity is better than -90 dBc at 1 KHz.
Aliasing at multiple of the 1 MHz sampling frequency are suppressed by 
at least -32 dB (1 MHz), -38 dB (2 MHz).