LAN TCP-IP COM-5001 -> Arbitrary Waveform Generator COM-8001 -> 
Dual D/A conversion COM-2001  -> Dual band 915 Hz - 2.4 GHz modulator COM-4001(option -C or -D)

Note: this script only works with COM-4001 option -C or -D.

This test setup demonstrates the ability to 
- tune to the extreme frequencies: 850 MHz, 1 GHz, 2.025 GHz, 2.5 GHz
- switch between internal and external 10 MHz frequency reference
- load a baseband waveform containing in-phase and quadrature sinewave samples 
  (I & Q channels).
- Playback the file into a dual D/A converter.
- Check the waveform purity using a 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_2001_4001cd.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-4001 RF output and a spectrum analyzer capable
    of processing RF signals up to or greater than 2.5 GHz.

(d) connect a 10 MHz external frequency reference to the COM-4001 EXT_CLK port (J2). 
A convenient source for this signal is generally found at the back of spectrum analyzers or
RF signal generators.

(e) import the 5001_8001_2001_4001cd.stn configuration file. 
Power the assembly down, then up again.

(f) using the ComBlock Control Center Functions | Pattern Generator, 
upload the file "sine_wave_I_Q_2560.txt" (same directory as the 5001_8001_2001_4001cd.stn settings file).
The file contains samples in decimal format. Do the entire upload, starting at address 0.
Select Action = Start Upload. Then Apply.
The menu should show a quick progress bar, then indicate upload completion with 2560 bytes uploaded.

(g) using the ComBlock Control Center Functions | Pattern Generator, 
download the file. The data is 'pushed', at a rate of 2Msamples/s, with 20 bit output width.
Select Action = Start continuous download. Then Apply.
Tune the spectrum analyzer to 850 MHz center frequency.

(h) Using the ComBlock Control Center, change the COM-4001 REG6 to the following values and observe
the following spectrum outputs:
REG6 = x25 selects RF frequency 1, 100 KHz steps. Output is -3 dBm (typ) @ 1 GHz - 39.062 KHz
REG6 = x45 selects RF frequency 2, 100 KHz steps. Output is -8 dBm (typ) @ 2.025 GHz - 39.062 KHz
REG6 = x65 selects RF frequency 3, 100 KHz steps. Output is -10 dBm (typ) @ 2.5 GHz - 39.062 KHz

(i) Transmit level:
Set COM-4001 REG5/4 from 03 FF (maximum gain) to 00 00 (minimum gain)
Output level should be 15 dB lower @ 2.5 GHz. (goes down from -10 to -25 dBm @2.5 GHz).

(j) Modulator on/off:
Set COM-4001 REG6 bit 2 to 0. 
Output level should be below the spectrum analyzer noise floor.

(k) 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.
The center frequency may have moved by as much as 75 ppm (63.7 KHz)