Forgot to add obsevations when using my sig. gen. as local osc feed to mixer:
The output from the sig. gen. is connected via a blocking capacitor direct to the cathode of the 6AC7 pentode I am using as a mixer, initially I set the coarse and fine attenuator controls for maximum output on my AVO CT378A this gives 25 mv at the output if terminated with a 75 ohm load, the cathode resistor is 390 ohm, reception was possible but rather week, I checked the sig. gen. specs for the "force" output and it quoted 200 mv into a 200 to 300 ohm load so I used that facility, I set the RF out to the red line on the gens. thermo couple, the receiver works well but I noticed that advancing the RF out a bit further to FSD the received signals increased in strength proportionatly, I am not sure what the optimim injection voltage is as just over 200 mv is all I can push, even at the level it gives some hope of using the harmonic generator idea as originally discussed, we will have to see.
Lawrence.
The output from the sig. gen. is connected via a blocking capacitor direct to the cathode of the 6AC7 pentode I am using as a mixer, initially I set the coarse and fine attenuator controls for maximum output on my AVO CT378A this gives 25 mv at the output if terminated with a 75 ohm load, the cathode resistor is 390 ohm, reception was possible but rather week, I checked the sig. gen. specs for the "force" output and it quoted 200 mv into a 200 to 300 ohm load so I used that facility, I set the RF out to the red line on the gens. thermo couple, the receiver works well but I noticed that advancing the RF out a bit further to FSD the received signals increased in strength proportionatly, I am not sure what the optimim injection voltage is as just over 200 mv is all I can push, even at the level it gives some hope of using the harmonic generator idea as originally discussed, we will have to see.
Lawrence.
