4 (tr)uSDX Manual

General Overview:

Overview: Pin-Out of external connections

  • When external Speaker / Headphone is connected, on-board speaker will be disconnected / disabled.
  • When external Microphone / Paddle / Key is connected, on-board Microphone will be disconnected / disabled.
  • USB and Power Supply can be connected at the same time. Main Power Supply has always priority and will be prefered over USB 5V by the rig, when connected.
General Usage / Overview
Setup for DigiModes and CAT Control.

For firmware 2.00t and above, a baudrate of 115200 instead of 38400 needs to be used.

See here how to use (tr)uSDX CAT on other operating systems:

Here is more detail about the (tr)uSDX supported CAT commands and extensions (such as CAT streaming): 5 (tr)uSDX Details.

Reference Oscillator Calibration

Firmware 2.00t and above do have a spectrum display, when holding the left button and tuning the frequency dial. Here a video about the feature:

Spectrum scope hile holding left button

The following Information is NOT 100% accurate and needs to be updated:

eft ncoder ight button, =turn, =hold button (longer), ◯◯=fast double click, ◯-◯-=slow double click, ◯-⥀=hold button and turn

Action(Menu) FunctionValues
onⒺ-Factory Reset
Enter menu
Ⓛ-⥀Quick Enter menu
Menu Exit
Ⓔ-⥀1.1 Volume1-15 in 6dB steps, 0 is Power-Off
1.2 ModeLSB, USB, CW, AM, FM
ⓇⓇ1.3 Filter BWFull, 3000, 2400, 1800, 500, 200, 100, 50 Hz
ⒺⒺ1.4 Band80,60,40,30,20,17,15,12,10m
1.5 Tuning Steps ↧10M, 1M, 0.5M, 100k, 10k, 1k, 0.5k, 100, 10, 1
Ⓔ-1.5 Tuning Steps ↥
Ⓡ-Ⓡ-1.6 VFO ModeVFO-A, B, Split
ritRIT Exit
1.9 NR0-8 exponential averaging step
1.10 ATT0, -13, -20, -33, -40, -53, -60, -73 dB
1.11 ATT20-16 in 6dB steps
1.12 S-meterOFF, dBm, S, S-bar
2.1 CW DecoderON, OFF
2.4 Semi QSKON, OFF
2.5 Keyer speed10-40 Paris-WPM
2.6 Keyer modeIambic-A, B, Straight
2.7 Keyer swapON, OFF
2.8 PracticeON, OFF
3.2 Noise Gate0-255 in 6dB steps
3.3 TX Drive0-8 in 6dB steps, 8=constant amplitude
3.4 TX Delay0-255 ms
4.1 CQ Interval0-60 s
4.2 CQ MessageTransmit CQ text
8.1 PA Bias min(0-255) representing 0% RF output
8.2 PA Bias max(0-255) representing 100% RF output
8.3 Ref freqsi5351 crystal frequency in Hz
8.4 IQ Phase0..180 degrees
10.1 BacklightON, OFF
onⒺ-Factory ResetⓇⓇAudio Filter
Enter menuTuning Steps ↧
Ⓛ-⥀Quick Enter menuⒺ-Tuning Steps ↥
Menu ExitⓇ-Ⓡ-VFO-A, B, Split
offPower-OnritRIT Exit
LSB, USB, CW, AM, FM4.2Transmit CQ message
onⒺ-Factory ResetⓇⓇAudio FilterVFOⓇ-Ⓡ-VFO-A, B, Split
Enter menuⒺⒺBandⒺ-⥀Volume/Power-OffⓇ-RIT
Ⓛ-⥀Quick Enter menuTuning Steps ↧offPower-OnritRIT Exit
Menu ExitⒺ-Tuning Steps ↥LSB, USB, CW, AM, FM4.2Transmit CQ message
1.1Volume1.9NR2.7Keyer swap8.1PA Bias min ( 0% RF)
1.2Mode1.10ATT2.8Practice8.2PA Bias max (100% RF)
1.3Filter BW1.11ATT23.1VOX8.3Ref freq
1.4Band1.12S-meter3.2Noise Gate8.4IQ Phase
1.5Tuning Steps2.1CW Decoder3.3TX Drive10.1Backlight
1.6VFO Mode2.4Semi QSK3.4TX Delay
1.7RIT2.5Keyer speed4.1CQ Interval
1.8AGC2.6Keyer mode4.2CQ Message