NW Digital Radio Blog page 8

Delivery is in the eye of the beholder

Just finished showing the APRS 9600 Transmit Demo at Pacificon.

Dennis has the IQ Receiver socket pushing data thru to his workstation allowing post processing of the eye pattern. Here’s a snapshot:


At this point we’re pretty comfortable with accepting orders for the UDRX this year for delivery in Q1!

I will continue to post progress updates as we move forward.

Configuring ircddbGateway and dummyrepeater on Raspberry Pi

This blog post has been moved to it’s own page

DV3000 Qualified on the Raspberry Pi Model B+

The DV3000 has been tested on and works with the Raspberry Pi Model B+

Note placement of the DV3000 on the 40 pin header. The rest of the procedure is as outlined for the Model B

News from DCC in Austin

Basil has the complete AX25 stack bolted to the transmitter. Proto 3 was shown tossing 9600 APRS packets to a Yaesu VX-8 at DCC in Austin. This includes the socket interface with support for IPV4 and V6.

We are now doing compatibility testing with commonly deployed 9600 TNCs. We don’t anticipate any issues with any properly functioning TNC, this is just a verification list:

  • Kantronics 9612 plus
  • Timewave PK96
  • Yaesu VX-8
  • Kenwood D710

Dennis has a non-coherent receiver working (it actually does FM Voice) which is the front end for the decoder. He is also working on a coherent receiver for higher speed modems which will give us an additional few dB.

We will provide another update after Pacificon in a few weeks.

Keep the Faith,

UDRX Proto 3 has arrived

6 Units of the third, and hopefully final, UDRX prototype have arrived and passed power-up. We’ll release a complete project up-date at the TAPR/ARRL Digital Communications Conference in Austin TX on September 6th.

Hope to see many of you there,
Bryan – K7UDR


Customs Declaration

To our International Customers:

We all like to save money and don’t always agree with our Government’s Tax Policy.

But please, don’t ask us to falsify the customs declaration on your order.

Bryan K7UDR

Adding a Display to AMBEServer

An AMBEServer provides a great platform for supporting applications like DummyRepeater, which need a platform to convert audio to AMBE and back again.

In previous blog posts we have discussed using the AMBEServer with DummyRepeater, but have always used a display on another computer or HDMI monitor to accomplish this task.

I decided I would like to see if I could get a Raspberry Pi display attached to an AMBEServer for user interaction without the need for a remote computer display or HDMI connected monitor.

I decided to try the Adafruit Pi TFT as a display.  Here are the early results.  After receiving the PiTFT, I followed the assembly instructions and software install instructions. I used the deb file method rather than loading a new image.

The display came right up.  Here are the results.


DummyRepeater display on PiTFT


Stacked DV3000 and PiTFT on Raspberry Pi

Stacked DV3000 and PiTFT on Raspberry Pi


End view of DV3000 and PiTFT on Raspberry Pi -- Need supports

End view of DV3000 and PiTFT on Raspberry Pi 


As you can see this all stacks up nicely, I just need to come up with a support and a case to hold it all!

The current UI isn’t optimized for the 320×240 display yet, but as you can see the touch PTT/Transmit button is clearly visible and the TFT touch function of the board works.  The board also supports 4 buttons that UI designers could use for a menu operated or similar system.  Additionally, adding a USB or Bluetooth keyboard and mouse are supported.


DV3000 in Japan – Portable DummyRepeater

Note from our new friend Satoru, JA1SCW, on Olive Island in Japan

Portable DummyRepeater

Since I started D-Star about two years ago, I have been looking for a solution for a portable rig like the photo which consists of Raspberry Pi, DV3000, sound card, software, WiFi, battery and smartphone. You may use them as a friend of your daily exercise, walking!!I made hotspots and node adapters in total six to seven sets, but this is the very first ever set which is capable for accessing the networks supported by ircDDBgateway software. At this moment of time, only remaining issue is PTT as I prefer PTTing by using a speaker-mic rather than hitting a PTT button on a smartphone screen.I will be soon 70 years young! hi This requires skills for a soldering and programming but hope everybody could overcome difficulties you may be faced to. Thanks to a great product, DV3000 and people contributed for launching it.Very best 73s,  JA1SCW@ Olive Island in JapanThanks,  Satoru (Radio Name: Steve)



Photo of Portable DummyRepeater w/PTT

Based on information from G8BPQ, Saturo was able to simplify the Portable DummyRepeater and remove the external USB hub which supported a serial connector to get PTT.  Now his PTT goes directly to Pin 3 on the Raspberry Pi.


Block Diagram



Portable Dummy Repeater with DV3000

DV3000 Analog to D-STAR Bridge

VK5ZEA, Michael, of Port Lincoln, Australia treats us to another of his wonderful YouTube videos.

Using a Raspberry Pi, DMK URI, DummyRepeater and analog radio, Michael demonstrates bridging analog FM and D-STAR.

International Shipping

I did a quick check today on our International Shipments via the US Postal Service.  Here are the results:


  • Australia
  • Canada
  • France
  • Netherlands
  • Poland
  • Spain
  • Switzerland
  • United Kingdom


  • Germany


  • Belgium
  • Ireland
  • Italy
  • Japan
  • Norway
  • Russia
  • Ukraine