W4ZT Repeater
Union City, Georgia
CAT-1000 Repeater Controller
CONTROLLER
 
This is the OLD controller setup. The NEW controller continues to use the CAT-1000 controller board in a completely re-designed enclosure with interface circuits for the new GE Mastr II repeater. New pictures will be posted soon.
Here's the test setup. Bet you thought I just turned the screws until it sounded good.
The Tektronix 2445 oscilloscope was used to adjust the audio levels on the CAT-1000 repeater controller board. The Cushman CE-3 Communications Monitor was used to adjust the transmitter deviation. The controller panel is pulled out exposing the Computer Automation Technologies CAT-1000 single board controller. Click HERE for closeups of the test gear.
 

Overview of the controller board and all of its components. All external connections are made through connectors on the rear. The Spectrum Communications SCR-1000 repeater came with a simple controller built in. Extensive modifications had to be made to allow use of the more advanced controller outboard. The cables that plug into the rear of the controller have a mating connector which I brought out the rear of the repeater.
 
 
View showing the adjustments for audio levels on the controller. Input audio must meet certain limits and then internal levels are adjusted so that they will all match. The output level is then adjusted for the proper audio level into the transmitter.
This is a rear view of the repeater, controller and monitor receiver. You can see the controller board inside the gray chassis in the center of the picture. The large power supply heatsink seen on the back of the repeater in this photo no longer exists after replacing the internal power supply with an external switching supply.
 
CONTROLLER

Last update was on November 20, 2006 5:06