Hey,
I've installed the uBITX AGC board per the instructions and it just doesn't seem like its working correctly. I feel like I've gone round circles trying to make sense of it all.
In part I wonder if some kits were shiped with a lot of switches that are configured differently? I've attached a drawing of continuity checks of the supplied switch and it doesn't seem to make sense with the documentation.
I've also tried to understand the logic of the switch based on schematics I've found on ND6T's website and can't figure it out. Is there a schematic available for this particular board? I think a lot of my questions would be answered with a schematic.
Without going too far down the rabbit hole, here are two points to begin with:
* AGC is off with the switch in the up position (NOT down). This was determined by measuring the voltage on the S-METER Output; it drops to 0.0 volts with the switch in the up position.
* The voltage measurement at S-METER Output on the AGC board is very low:
??? -73dBm (S9):??? 0.02V
??? -53dBm (S9+10): 0.25
??? -63dbm (S9+20):? 0.78
??? This is using a Sark-110 for an input; the level was verified with a Siglent SSA 3021X. The Sark's lowest output is -73dBm. All measurements were made with S-METER Output attached to A7 of the Raduino.
Also attached is a drawing of how it's all wired up.
73, digger AB3XU
digger AB3XU
