How does MCL electronic line stretcher work?

Status
Not open for further replies.
M

multanova51

Member level 4
Joined
Mar 3, 2002
Messages
73
Helped
4
Reputation
8
Reaction score
1
Trophy points
1,288
Location
Vatican
Activity points
719
Hi all,

I am using a Mini circuits lab electronic line stretcher from the ELS series.
It works quite good and actually I am using it occasionally to check VCO load pulling for TX'es at about 868 MHz. You can change the phase over 360 degrees by applying a DC control voltage to it. Further is is quite broadband... The MCL device is especially made for load pulling tests.

Anybody that can point me to the way of working of this device ?
I just need to know how they do the phase shifting electronically...
Any article other than the Applic note from MCL that is on the MCL web ?
I want to make something similar for an application I have in mind. It must be controllable by a voltage or current.

Kind regards

Mike
 

rf line stretcher

From the key word "reflection" and the octave bandwidths, I suspect that it is a quadrature hybrid with the two ports on the left side connected to the outside world and the two ports on the right side connected to reactances through PIN diodes which act as variable resistors. Or possibly there are PIN diodes only across the right ports to ground acting like a variable capacitor. By changing the two right port terminations, the phase shift between the two left ports can be adjusted.
 

Status
Not open for further replies.

Similar threads

Menu
Log in
Register
Cookies are required to use this site. You must accept them to continue using the site. Learn more…