Category: DXmate

My Dit/Dah’s are Reversed?

You may find that your paddle is “reversed”, this really comes down to how we learned paddles. You can can reverse this by “swapping” the DSR/DCD settings in the DXMate Tab.

Digital Modes (JT65) Same for all Digital Modes (FT8)

Think of the DXmate as a “Radio”. The radio has a Mic input, a speaker out and a PTT. When you want to use digital modes with the DXmate you have to treat it the same way as you would a traditional radio. You will feed audio from your sound device to the mic input and you will take the audio form the headphones/speaker and feed that into your computer’s input for decoding. For PTT you have a couple of options.

1. If your external sound card device like a TimeWave Navigator or possibly a Signalink with built in VOX PTT will close the PTT line for TX.

2. Another option is configuring the software for CAT PTT. The digital software will send the K3 the serial command to place the transmitter into PTT.

We have made a number of JT65 contacts using the DXmate and a TimeWave Navigator sound card unit. The cable set for the TimeWave was the cable kit for the Elecraft K3/0-MINI.






8 Pin Mic Schematic

The 8-pin connector on the DXmate is compatible with microphones with the Elecraft or Kenwood pin configuration.

Screen Shot 2015-12-08 at 11.29.33 AM
Microphone jack, viewed from front of DXmate

  • Pin 1 – Microphone audio, low-Z (~600Ω)
  • Pin 2 – PTT
  • Pins 7 and 8 – Ground

Alternatively, you can connect a mono 3.5mm microphone into the MIC jack.

The PH 3.5mm jack is a stereo output for headphones.

Using a microphone with WebDX

  1. Connect to a station using WebDX.
  2. At the very right-hand side of the Chrome address bar, there will be a camera icon. Click the camera icon, then select the USB audio CODEC device as your microphone.Screen Shot 2015-12-08 at 11.34.48 AM
  3. Refresh the page for the change to take effect.
  4. The next time you power on a radio, your DXmate microphone will be used.
Using headphones with WebDX on a Mac PC
  1. Click the Apple menu at the top-left of your screen, then click System Preferences…
  2. Click the Sound icon, then the Output tab.
  3. Select the USB audio CODEC device for sound output.
  4. You may need to restart Chrome for this change to take effect.

Using headphones with WebDX on a Windows PC

  1. In the system tray of the taskbar, next to the clock, right-click the speaker icon and select Playback devices.
  2. Select the Speakers – USB audio CODEC option, then click Set default.
  3. You may need to restart Chrome for this change to take effect.

Latency Issues

If you are experiencing latency issues with your DXmate be sure to check the following:

1. CPU bound issues. Latency can be seen if your PC is consuming excessive CPU cycles. Close all programs other than chrome and the helper app and try again.

2. Be sure to have all the latest updated installed for your PC.

3. Turn off viris scanning/sypware software.

Wiring Diagram for DXmate

3.5mm PHONES: TIP = Left Speaker, RING= Right Speaker, Sleeve = GND
3.5mm MIC: TIP = MIC, RING= NO CONNECT, Sleeve = GND
3.5mm PAD: TIP = DAH/DCD, RING=DIT/DSR, Sleeve = GND

Plugging In Your Paddle/Key

Keyer Setup

  1. Plug the DXmate into your PC or Mac with the included USB cable. The DXmate does not require external power or special drivers.
  2. Open the RHR Helper app and select the DXmate tab. If you do not have the RHR Helper installed, install it now.

Mac OSX Com Port Setup


Step 2: For the DXmate Serial Port setting, click Disabled to bring up the serial port selection menu.

Step 3: Select the serial device ending in “A” like the image below (Please note: Newer MacOS version may show as “DualRS232” – See Pic below)

Screenshot 2015-11-17 15.05.15


Step 4: Click the check mark to save the setting. The serial port indicator will change to connected in green. Green is good.

Plug your key paddle into the PDL jack on the DXmate. Your key will now generate a local sidetone. Adjust the keyer speed and sidetone frequency as desired.If you are using a straight key or an automatic keyer (for example, a Winkeyer), change the Keyer Mode to Straight Key or Bug. In this mode, the Speed setting is ignored.

Screenshot 2015-11-17 15.05.34