From G3PLX: Dick: Sorry, decimal place wrong. The emitter resistor should be about 2200 ohms, or to be precise (9-0.7) volts divided by 3.5mA. I hope you haven't damaged the meter already! 73 Peter
Dick: With the figures you just gave, I would suggest you to connect the voltage from the RF sensor circuit straight to the base of an ordinary npn transistor, connect the negative terminal of your 1