Remi F1MQJ has modified the manufacturer’s v4.3 original firmware (published on may 23 2018) to include communication with KD8CEC memory manager.
This could be very useful for those wanting to stick with the HF Signals latest firmware, while making it easier to view or update initialisation settings, such as calibration of frequency or setting the BFO injection point, in the original firmware.
Modifications are the same as those described by Ian KD8CEC here but are adapted to the HF Signals V4.3 original firmware.
The file removes all text after .ino in your firmware directory replacing the original ubitx_cat.ino file.
You can access this file at the following URL:
- Tune to 7074 using LSB. You should hear nothing.
- Change to USB and you should hear all kinds of PSK and other digital modes. If you hear these signals in LSB then your BFO frequency is not correct, and may even be placed on the wrong side of the passband.
My BFO was way off after I first tried to calibrate it. I then started over with mine at 996.4 and ended up at 996.7. If yours is a long way off from that then I’ll bet you hear psk at 7074 when in LSB.
Many constructors have had issues calibrating their µBITx.
To begin with, you have to figure out how to get into the expanded “Settings” menu. Push on the encoder, and select “Settings”. Wait for the menu to exit automatically. Then press the encoder again and in turning the dial you should see the additional menu items displayed.
Jacob AG7CT has documented the steps he takes to calibrate his µBITx:
- Tune to WWV on the dial
- Enter menu
- Turn setup on
- Reenter menu turn to and select calibrate
- Zerobeat the WWV carrier. (May be difficult if BFO is too far off.)
- Click PTT.
- Click encoder, select set BFO.
- Zero the sideband off WWV.
- Click PTT to set.
- Click encoder, turn setup off.
- Wait more than 10 seconds to ensure setting are saved before removing power.