70 MHz DSSS modulator 
COM-5001 LAN Network Interface 
  -> COM-7001 Turbo code encoder 
    -> COM-1012 DSSS modulator 
      -> COM-4004 70 MHz modulator
    -> COM-6001 front-panel display

This assembly is to be tested in conjunction with the L-band DSSS demodulator


(a) Connect external 10 MHz, LAN, 110VAC power, serial link to host PC, 
and the IF1 port to a spectrum analyzer.
Turn the power on. 
Using the ComBlock Control Center, enumerate. 5 ComBlocks should be identified.
Import the settings file 5001_7001_1012_4004_6001.stn.

(b) Check that the modulated spectrum is as follows
- centered at 70 MHz
- -6 dB bandwidth is 166.6 KHz
- level is about -14.6 dBm
- sidelobes at 2*modulation bandwidth (333 KHz) are at -54 dB below the main lobe 
(used a 10 KHz resolution bandwidth and 1 MHz span).

(c) Configure the COM-6001 display as 2A 30 31.
Displays shows 3 green leds and "01".

(d) Ping address 172.16.1.128 from the ComBlock Control Center 
Operations | Communication Setup menu. All four answers should be 
received within 10 ms or less.

(e) establish a hyperterminal connection over TCP-IP 172.16.1.128 port 1024, 
send a test file using the hyperterminal menu transfer | send text file.
The average speed for transfering the file is 166.6 Kchip/s / 127 = 1.311 Kbit/s.
This means that a 10 KByte file should take 61 seconds to transmit.
Verify that the entire file goes through (send a second one, it should start).