Most low power users are 100mW or more.
And 100mW is polite enough when tuning up.
Into 50 ohms, that's sqrt(0.1*50) = 2.24 volts rms of RF, or 3.16 volts peak.
Assuming we keep the 10 to 1 transformer ratio (so can still take readings when at 20W),
that's 0.316 volts for the diode detectors to see when running at 100mW.
I'd think that if the schottky diodes had a bit of forward bias supplied as Art suggested,
they could be working pretty well at 0.316 volts.
Going lower where it's non-linear, could use some of that table lookup flash you had been allocating for the AD8307.
Yes, the germanium stuff is very temp dependent.?
I don't really know how well this diode thing will work on the low end.
But I think 100mW? may prove sufficient for sniffing out an antenna.
Will try to wire this diode detector tandem match up to my Nano, see what it does.
Jerry
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On Mon, May 7, 2018 at 11:56 am, Kees T wrote:
I thought the low power levels would be useful for the low power users and not having to forward bias diodes which are still very nonlinear at the low end would be nice. Ge diodes I tested, about 10 types, were VERY inconsistent.....hence the HSMS-2815.
