Yes, you can do this Mike.? Some details follow:
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You will need to provide +5V and at least one temporary button, but better if you do all 3 (Auto, Reset/Tune, Bypass).
And if you want to some LED feedback, put an LED with a series resistor (a few K) on each of the two LED lines.
These signal pads are all labeled on the Mount Board, so you can see which connector pin is which.
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A convenient place to patch in the +5V is the second hole in from the very corner where the inductor for the power supply would normally be.
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The standalone operation will work like this, but I think it wakes up initially in auto mode:
- A short-press on the Auto button activates automatic mode (which stays on, even after a reset, until turned off).? Another press of this button turns off Auto mode.? Auto mode automatically detects RF power and tunes when SWR > 1.3 or a significant change in SWR occurs.
- A short-press on the Reset/Tune button will reset the ATU (releases all relays, i.e. bypass, and put the software in initial state).
- A long-press on the Reset/Tune button will manually put it in Tuning state, waiting (forever) for an RF signal to tune.? When it receives RF above the minimum power, it will tune, save the tuning setting, and exit the tuning state.
- A short-press on the Bypass button will release all the relays, another press will put them back the way they were (bypass toggle).? While bypass is active, auto mode is turned off
But for testing, the following is a useful function:
- If you power-on while pressing all three buttons, it enters a "fast test" mode.? All relays are energized (for both C and L).? This means that the 'short' is removed across each of the inductors, so you can do test probing.? One good test is to probe from end-to-end on the inductor chain, touching just the board contacts, and if you have continuity, that means you have good solder joints on all inductors.
- There is another test mode, entered by just pressing Bypass and Auto while starting up.? This one allows you to step through each switch setting in order by pressing the buttons - but it is hard to keep track of where you are, so it is not as useful in this context.
This is all described in detail in N7DDC's documentation for the ATU-100 7x7 (EXT) board.? Our ABS tuner uses Barb's SOTA repackaging of that tuner, with settings for use at low power, and has almost the same firmware.
- "Almost" here is important: Sardar wanted 1-button Auto operation, and to have the LEDs indicate Auto mode and Reset, rather than their original Red/Green SWR indication (since QMX+ already has an SWR meter).? So you won't get the LED behavior in N7DDC's doc, you will get Sardar's: one LED will be 'on' in auto mode, the other will go 'on' during reset.
- But you will get N7DDC's button behavior, not ABS button behavior.? Sardar's ATMega intercepts the 'Auto Button', and implements a single-press auto-mode on/off toggle, plus a long-press reset on that same button (and doesn't use the other buttons.) - But that is all on the companion board, so stand-alone ATU use will follow N7DDC's button behavior.
- N7DDC's doc: ? (I also just posted this at my ABS info link).
I hope that helps (and wasn't too much...)
Stan KC7XE
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