4 (tr)uSDX Manual

General Overview:

Overview: Pin-Out of external connections

button shortcuts:

  • 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

CAT usage

Here is a guideline how (tr)uSDX CAT can be used on other operating systems:

Setup for DigiModes and CAT Control.

Firmware 2.00t and above, requires a baudrate setting of 115200 (instead of 38400), the supported CAT protocol is Kenwood TS-480.

Digital modes without Audio Cables

It is also possible to use digital modes over USB cable ONLY (no audio cables and sound cards are needed!), the audio stream is transported over the CAT serial interface.

There are various applications that supports the (tr)uSDX CAT streaming protocol:

  • Digimode usage (WSJT-X, JS8CALL, WinLink) on your Windows/Linux PC or Raspberry PI is facilitated with a special (tr)uSDX CAT streaming Driver. Below a video demonstration:
Streaming audio over USB
  • FT8CN is a famous FT8 app for Android and supports (tr)uSDX CAT streaming since version 0.91, all is needed is a USB-OTG cable from the phone to the (tr)uSDX. (here an old beta: FT8CN_0.91_Beta10_20230910)
  • PocketRXTX and jAReC, from Dan YO3GGX, is an extensive transceiver dashboard on your PC or mobile phone that implements (tr)uSDX CAT streaming support.

More details about the supported CAT commands and extensions (such as CAT streaming) can be found here: 5 (tr)uSDX Details.

Frequency Calibration

Reference Oscillator Calibration

Spectrum Display

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

Menu Functions

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

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