It's interesting that the noise floor has been around -93 dBm, with and without the first mixer post amplifier.? Will explore this some more.? I wonder if the log amp is setting the floor now.
The BFR106 seems like a good candidate.? The only concern might be power supply (Vceo is 15-16V and specs are at 8V).? What voltage have you been using?
I'm mostly a HW guy but an improved user interface would be nice.? I had thought of changing the pot to an encoder and some other improvements.? More computing power and a graphic display would be nice.? I've thought of pairing the Specan with a Rasberry Pi.
I'll order some BFR106's and let you know how I make out.? Thank you for helping,
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David KV4FP
