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Pre-Orders Closed

Thanks to the 235 early adopters who ordered 322 UDRs!

Your commitment and enthusiasm are making this product a reality.

We still have a lot of work to do and I will be posting progress on the website as we move towards delivery.

When we have a firm date, all Pre-Orders will receive an order confirmation. At that time you may change or cancel your order.

Once the pre-orders are shipped, we will accept regular orders for delivery from stock.

Bryan K7UDR

UDR56k Discount Ends this Week

Thanks to the nearly 300 early adopters that have pre-ordered.

Make sure to take advantage of this opportunity before it ends June 15th, as you won’t be seeing these discounts on low volumes again.

Pre-orders have the right to increase their quantity or cancel at confirmation time.

10% for a single UDR, save $40

Get a club buy together and save even more:
15% for two or more, save $60 each

Pre-Order Discount Extended

Hi All,

We’ve updated our web-site and rebuilt our database for accepting and tracking Pre-Orders.

We are extending the discount thru June 15th, to take care of our early adopters at Hamvention and Seapac.

Make sure to take advantage of this opportunity, as you won’t be seeing these discounts on low volumes again.

10% for a single UDR, save $40

Get a club buy together and save even more:
15% for two or more, save $60

Q1 Update

I hope the new year finds you all well,

Our goal is to provide the best possible digital radio at an attractive price and our efforts the past couple of months have been consumed with component tradeoffs to meet that goal with respect to price, performance and availability. Now with that behind us we have released the beta radio boards to manufacturing and should receive assembled units by the end of March.

Dennis has made great progress on the modulator and Basil has implemented a new interface using WebSockets.

We have substantial work ahead of us optimizing the RF, IF and synthesizer. I am now seeing component lead times reaching 8-12 weeks. Our best estimate is to have beta units in Q2 with production in Q3 (AKA Summer). All Beta units have been allocated.

We will be at MicroHams on Saturday March 23rd in Redmond WA with the new radio boards as well as an APRS demo.


We will be accepting pre-orders later this month. At that time we will release a preliminary Datasheet, User Interface and final discount pricing. These pre-orders will be for planning purposes and we will not be charging any deposit until we have a firm manufacturing slot.

Thank you for your patience,
Bryan Hoyer, CEO

Eclectic Technology Article in the December QST

If you’ve just arrived here from reading Steve Ford’s article in QST, there are a few things you should know that weren’t mentioned in the article:

  • The picture shows the first prototype without the substantial red heat sink
  • The prototype board has two SMA connectors, production units will have a single N connector
  • The UDR56K supports D-STAR DD mode from 4800 to 56 kbps and can be configured as a standalone D-STAR gateway
  • D-STAR DV mode is supported using an optional AMBE vocoder card

Download UDR56K-4 and make sure to subscribe to the website to stay up to date and receive a pre-order discount code. We also have an active Forum on yahoo groups where all things digital and radio are discussed.

Very Low Cost Computing

John’s recent talk at Pacificon



John will be presenting at Pacificon, October 12-13 in Santa Clara CA.

He’ll be talking about low-cost computing platforms for D-STAR and packet radio as well as the UDR56K. Stop by if you’re in the area.

A Hailing Channel for Packet Radio

Just gave a presentation here at DCC on declaring a single channel on 440 as a hailing channel, then QSYing to one of the other packet channels to handle traffic like email.

I thought this might be a natural way to bridge APRS and Winlink, but was nervous about the response from APRS users about using their channel.

Imagine my surprise when I asked the audience what frequency we should use, and none other than Bob Bruninga said:

“Use the APRS Frequency, that’s what it’s there for.”

Be sure to read Bob’s comment as posted on the APRSsig.

The video of the presentation was done by Gary at HamRadioNow and will be posted on the TAPR website.

Live Interview with Linux in the Shack

LHS #090 Live
Tuesday, September 4, 2012
8:15pm Central Time – All Ages
Live Streaming Audio (map)
The Internet, Worldwide

Catch John on the PAPA Net

The PAPA System ( has invited me to participate on their net this Thursday the 7th on D-PLUS REF012C at 8PM Pacific (0300Z).

Apparently there is a lot of discussion about the UDR56K in Southern California.

I will be giving a general overview of the genesis, technology, and applications for the UDR56K, followed by a Q&A for net check-ins.

Since this will be “on the air” over amateur radio, I will not be able to provide any responses to questions related to sales or support.

The net can be accessed for check-in on REF012C. REF012 is also available as an audio feed at