Hello Tim,
I am sure you will have fun with your uBitx. The more I work on this unit, the more I appreciate what a great achievement it is for the price point. Add a few circuits, Ian's software and you have a rig that had not much to envy from the commercial rigs IMHO.
Back to the AGC. Yesterday I focused on the MAX9814 solution as I have ripped off the other schemes from my rig.? I found an error on my board which was limiting the AGC effect of the MAX9814 so it is much happier now.?
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I also found the reason for what I thought was low signals distortion. It was in fact a very sharp impulse noise, I suspect the solar inverter next door as the noise disappeared in the evening as the sun went down (I am not at my home QTH at present so I am discovering the local QRN as I go). The FT-817 does pick it up as well, but since the uBitx sound level is a bit down even at max volume that noise was not that obvious with the AGC bypassed, but quite audible when the AGC was at max gain.
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So far the MAX9814 solution has been the best from my perspective as I am trying to somewhat reproduce a commercial rig's AGC effect.
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I am posting the results in a new thread, specific to the MAX9814.
All the best,
73, John (VK2ETA)
