20-05-2012, 11:33 AM
Here is the circuit I've come up with for the trial RF amp version, I will probably go for cascode RF in the final setup. for practical reasons itt was not possible to use the primary of the mixer tuned circuit coil in a HT circuit, hence the choke/capacitor coupling
The screen voltage on the mixer is quite critical so to that end I have used a preset pot. the screen (G2/G4) should sit somewhere around the 20 volts level.
The resistor across the regen pot was fitted to pan the control out a bit as I only had a 50k pot to hand.
The performance of this receiver is getting better each time so far.
Any comments/suggestions welcome.
Lawrence.
The screen voltage on the mixer is quite critical so to that end I have used a preset pot. the screen (G2/G4) should sit somewhere around the 20 volts level.
The resistor across the regen pot was fitted to pan the control out a bit as I only had a 50k pot to hand.
The performance of this receiver is getting better each time so far.
Any comments/suggestions welcome.
Lawrence.
