Re: Tell me your favorite uBitx mods
Diver Martin <diver.martin@...>
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So looking at the schematic, it's basically an IF amp (MC1350P, which is obsolete/harder to get, though I have gotten them from Jameco before) with a dual gate mosfet as the attenuation stage. The rest is just a separate amplifier (Q504-509) and a detector diode (D502) feeding that gate.
What I would ultimately want to do I think is provide one input, and one out on the add-on PCB that I'm doing, and maybe cut at Q30 on the uBitx to get the RF input. To do the mod, one would cut the trace as indicated, and then solder in some 30ga wire that goes up to the motherboard, which provides the modification. I'm thinking Q30 is probably the best place to put the AGC, as after the 12Mhz narrow filter, there is no other amplifier, so I'm kinda limited to the 12kHz bandwidth filter to do the AGC I think.
On Mon, Jan 1, 2018 at 2:29 AM, Dave Bottom <ars.kd6az@...> wrote: