Using the EZ-KIT SHARC HF channel simulator
      -------------------------------------------

1) mdir hfsim, cd hfsim
2) xcopy a:*.* . /s
3) edit/add environment variable (this is for COM2 and your COM port
   must be capable of handling 115200 - Windows DOS box is OK).

SET ADSP0=0,23,5,2,115200
                 ^
                 |...... this is set for COM2 at 115200

4) Let's for example want to simulate a POOR path, at 10 dB SNR, then
   diag21k

   fl 10_poor ..... (if there is a timeout message - this is OK)
   ps	      ..... Red LED#2 should be blinking
   x

   This procedure can be repeated for other conditions
   simply by re-starting "diag21k".

   There are two simulator files available with this sample,
   10_poor (CCIR POOR, 10 dB SNR), 
   40_poor (CCIR POOR, 10 dB SNR), 
   5_pass (Pass through with 5 dB SNR).

   For a comprehensive simulator package, please e-mail me for further
   details.
 
5) Setting up levels etc....
   Two devices are connected back-to-back through the simulator.
   For a half-duplex configuration, make the following connections:

   EZ-KIT Left  input---+-------330 OHm-------------Unit A output
   EZ-KIT Right input---|-------330 OHm-+    +------Unit A input
					|    |
					|    |
                                +------------+
                                |       |
   EZ-KIT Left  output----------+       +-----------Unit B output
   EZ-KIT Right output------------------------------Unit B input

   When connected like this, both devices hears the same traffic,
   and since only one is transmitting at a time, the audio
   is interleaved with both forward and reverse direction traffic
   passing through the simulated environment.

   The simulator dynamically computes the right amount of Gaussian noise
   to be added to the signal by computing, in real time, a running average 
   of applied signal power, i.e., no signal - no noise. 

   Input signal level should be adjusted to a level where these added noise
   peaks are not exceeding the limits of the audio hardware. If that
   happens, a scratchy output will be noticeable. It may be necessary to
   amplify the simulator's output externally should the level appears to be
   insufficient to drive the target device.                                                   


Enjoy!


February 3, 1998

Johan Forrer

e-mail: forrerj@peak.org

Oregon Hardware-Software Factory
26553 Priceview Drive, Monroe OR 97456
FAX/Ph: (541) 847-5416