Remote Control of CPS automatic matching networks

Most CPS matching networks are equipped with an analogue remote control facility. This is connected via a 15 way D connector, and the pin out is common across nearly all models.

The 15 way socket D type connector on the rear panel allows remote control of the generator. The connector supplied is of the filtered type, It contains individual capacitive feed through filters, one per pin. It is recommended that this type of connector is always used.

Description Of Remote Connections / Functions.

1. Remote LOAD base position. This is enabled by grounding pin 12. A voltage of 0 to 5v sets the base position of the Load capacitor with 0v giving minimum capacitance and 5v giving maximum capacitance.

2. Remote TUNE base position. This is enabled by grounding pin 12. A voltage of 0 to 5v sets the base position of the Tune capacitor with 0v giving minimum capacitance and 5v giving maximum capacitance.

3. TUNE Position.  Pin 3 is an analogue output voltage 0-5 volts representing tune capacitance. This output can source 5mA.

4. LOAD Position.  Pin 4 is an analogue output voltage 0-5 volts representing load capacitance. This output can source 5mA.

5. Not Used.

6. BIAS. Pin 6 is an analogue output giving the bias voltage scaled to -5v for a bias of -2000v. This pin is buffered and may be connected to the bias input of a RFG.

7. Ground

8. Ground

9. Return to base Indicator. Pin 9 is an open collector transistor that grounds when no RF is detected. This can sink 45mA 20V.

10. Not Used.

11. Not Used.

12. Enable Remote control. Grounding this pin enables remote base position control via pin 1 and pin 2.

13. Not Used.

14. Return to base Indicator. Pin 14 duplicates pin 9

15. +5V. This is a +5V 500mA Output, useful for lighting LEDs or powering simple adapters.