Re: Spectrum Analyser
It is good for above 500kHz when driving the 3RP1A, not that it's needed for a spectrum analyser. I didn't thermally tie the fets together and the circuit does drift a bit for the first few minutes of operation. I used BC178s for the output pair and just a pot as the input attenuator everything else as per the circuit. A very simple circuit and more than enough gain when using the G4PMK circuit.
Dave
GW7ONS
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