cable 8x~1.75m=~14m 

14.3m 

150ns

300m/us


http://www.picwire.com/technical/velocity_factor.php propogation coffiecent 

In theory, electrical signals move at the speed of light. Cables only slow them down. 
The ratio of actual speed to the speed of light is known as the velocity factor, 
or Velocity of Propagation (VOP), expressed as a percentage of the speed of light in free space.

This slowing effect is almost entirely caused by the dielectric material; 
in coaxial cables, the insulation between the shield and the center conductor. 
For a closed-cell foam dielectric, for example, the VOP may approach 90%, 
meaning that a signal will travel at 90% of the speed of light. 
For solid TeflonŽ, the VOP is typically about 70%. 




The cable is 14.3 long so there and back is 2*14.3 = 0.095 us

D-[820]--+---cable---[term]
         |
         |
         scope


1MHz clock 470 resitor 50 Ohm cable - measured at inputs


Terminations:
OC		DS0002.bmp
150ohm		DS0003.bmp
75ohm		DS0004.bmp
51ohm		DS0005.bmp
27ohm		DS0006.bmp
sc		DS0007.bmp




D-[820]--+---cable---[oc]
         | |
	 | //term
         |  
         scope


1MHz clock 470 resitor 50 Ohm cable - measured at inputs


At sourceTerminations:-
OC		DS0008.bmp	
150ohm		DS0009.bmp
75ohm		DS0010.bmp
51ohm		DS0011.bmp
27ohm		DS0012.bmp
sc		DS0014.bmp
sc		DS0015.bmp
sc		DS0016.bmp
sc		DS0017.bmp


D-[820]--+---cable---[51R]
         | |
	 | 
         |  
         scope


1MHz clock 470 resitor 50 Ohm cable - measured at inputs


At sourceTerminations:-
51ohm		DS0013.bmp