SDR(X): New Upconverter for the RTL-SDR

A new UK designed and manufactured upconverter that goes by the name SDR(X) has recently become available for purchase. This upconverter connects to a RTL-SDR dongle and allows it to receive from 100 kHz up till 1850 MHz. Some of its features include:

  • Four user selectable HF pre-filters (0-2, 2-6, 6-11 and 11 to 30MHz) or single 0-30MHz pre-filter.
  • Band pass filter after mixer and band pass filter after Oscillator
  • User selectable MMIC 18db amplifier external to RTL chip set (lower noise level, than RTL chip and compensates for pre-filters).
  • User selectable HF and VHF/UHF mode (HF 0-30MHz, VHF/UHF mode 24MHz to 1850MHz).
  • Microchip PIC controller for above.
  • Diode protection on RF input.

The board comes as a prebuilt kit which is currently selling for 79.95 GBP which includes an RTL-SDR dongle. The device also comes with complete documentation. The SDR(X) can be purchased from

Image of the SDR(X)
Image of the SDR(X)
Notify of

Inline Feedbacks
View all comments

Nicely done integration of an up-converter with the ubiquitous DVB dongle.

The addition of multiple input bandpass, LO and output filtering will significantly clean up HF reception.

This single board implementation eliminates the need for additional adapters, cabling and power connections.

Only issue is use of 100MHz LO (e.g. potential interference with lower HF band reception due to overlap with part of the FM broadcast band).


There are no FM broadcast band breakthrough problems that I could detect due to the rtl dongle amplifier being run at low or 0db gain. This can be done as there is a 18db gain mmic on the HF side

Ton muller

hmm, is this a upconverter only ?
or a complete unit ?
websites say’s complete unit.