KerberosSDR Batch One End of Stock, Batch Two Preorders Available

If you weren't aware, KerberosSDR is our recently released 4x Coherent RTL-SDR which can be used for tasks such as direction finding and passive radar. KerberosSDR was successfully crowdfunded over on Indiegogo, and we have recently completed shipments to all backers. Currently there is only about 20 units of the batch one production left in stock.

We are currently offering discounted preorders for batch two units on Indiegogo which we expect will be ready to ship in July or hopefully earlier. If you are interested, please order soon to avoid missing out as the price will be raised again once we are shipping. Batch two will be the same as batch one except for some minor changes. For example we have decided to convert the microUSB port into a USB-C port as we have found that there are many very poor quality microUSB cables on the market which could cause issues for users. USB-C cables are generally of a higher quality.

More information about KerberosSDR is available on the Indiegogo page.

KerberosSDR Updates

Since our last post on this blog about KerberosSDR we have made some enhancements to the software.

  • The KerberosSDR code is now fast enough to run at 1-2 Hz update rates for direction finding and passive radar on a Raspberry Pi 3 B+.
  • There is now a web interface, so the KerberosSDR can be controlled via a WiFi hotspot and internet browser. Useful for use on the Pi 3 and Tinkerboard.

For future updates we are currently working on several new features:

  • Filters to remove low confidence DoA results on the Android app.
  • A secondary heatmap type display on the Android app based on signal strength, for two direction finding indications.
  • Methods to determine the center of multiple bearing intersection points.
  • Further enhancements to processing speed, possible improved results from processing gain and possible better accuracy from improved DoA algorithms.

Within the next few weeks we will also release full tutorial videos that will show how to set up and use the KerberosSDR for direction finding and passive radar with a Raspberry Pi 3 or Tinkerboard. If you prefer a text based explanation we already have a guide up at

Below is an image that demonstrates the KerberosSDR direction finding Android app. A user of KerberosSDR has also submitted two of his own screenshots that show that he was able to determine the location of a GSM transmitter with a linear antenna array.

KerberosSDR Direction Finding Results
KerberosSDR Direction Finding Results. Multiple data points collected during a drive, with bearings pointing towards the TX tower (red marker). Circular array of whip antennas used at freq. 858 MHz.
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Did the new RPi image have been posted on ?? If yes, is it version 1.2?? (Raspberry Pi 3 / B+ Download IMG V1.2: )

Roger Oveur

you know after looking at this….this would make a pretty good, actually beyond excellent multisystem/channel trunking/digital receiver setup with a little bit o PiDuino coding on a controller…this thing would put a Uniripdemoff SDS200 to shame ….and at 1/10th the price no less. (and no need for exorbitant decoder “fee’s” either…)


I don’t care about their radar thingy in the least. 4 nice SDR’s in a box…

Connected up to my SDRTrunk box and its running along fine using 2 tuners.

Problems are:

1) HEAT – Case needs ventilation holes/slots or a fan – I am likely to ditch the metal case shortly and put it in something else or slice and dice that case for some ventilation…..

2) SDR EEPROM is CORRUPT – Thus rtl_test WILL LIKELY BRICK It to set S/N#, as the corrupt EEPROM has CORRUPT S/N. This is an issue with programs like SDRTRunk which use the S/N’s an index. Although it seems to work by luck or fluke right now with 2 tuners for my main test system.

3) Power – Needs to deal with using a proper DC power connector v. USBC and/or trying to get 3A from a USB port… So get a good 5V 3A+ supply….

4) UBS Ports – Seems to dislike some USB ports. I had it plugged in fine, ran for about a week… now it won’t work in either of those USB ports, I had to dig around on the box to find a USB port it would like… (Device is POWERED BY A PS to the USBC port! 5V 3A)

Have not tried it with OP25 yet, as I been testing out other things…and mainly I am concerned unplugging from that box and port and plugging back in after using OP25 on a different box it won’t work at all on that box.

As for license crap.. you can blame two things…

A) DVSI – The WORST company on the planet to deal with … and even P25 is encumbered with this crap. sighhhh… 99.9% of the cost of this is DVSI’s exorbitant licensing even with real radios makers, its out of this world. I can only imagine the grief and crap uniden had to put up with to get this deal.

B) A certain relationship with a certain site which is enriching one person at the expense of others in the community… Thats why I don’t purchase certain radios, they rely on a data store which I am not enriching with my knowledge. all becuase 99.999999% of users are TOO LAZY to learn to program a device. … sighhhhh.