Connect the SDRPlay RSPs via TCP IP to Multipsk

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Revision as of 13:46, 12 November 2019 by Ka3jjz (talk | contribs)


  • This capability started with version 4.39.10. As always, be sure to get the most up to date version from the website
  • These instructions are built around the RSP1; for the RSP2 (maybe other SDRPlay RSPs, too), it appears you need to start RSP_TCP.exe first, but this needs confirmation
  • A PC with some horsepower is needed for using TCP/IP. A PC with at least a 1 Ghz processor is a good starting point


When you push the SDRPlay button (figure 1), an I/Q signal will be sent through the TCP/IP server using rsp_tcp.exe. According to tests, it works with Windows 10 and probably earlier versions of Windows. Vista has been tested successfully.

The sampling frequency is 250 Khz (except for ADS-B, which uses a 2 Mhz sampling frequency).

The default TCP/IP parameters are given below; they can be changed by clicking the Options (port/adress) button, which is found immediately below the SDRPlay button (figure 1).

  • The default address is To use another server, paste the server IP address here
  • The default port is 1234. but it can be changed with the spin button. Valid values are from 1231 to 1250. This allows the use of several occurrences of Multipsk, each one connected to a different server and receiver.

If you wish to listen to the demodulated sound, click on the +Speaker button

Once you press the RX/TX Screen button, you can use the Transceiver form to control the frequency and gain. Note that the TX button on this form won't function (figure 2). In addition, references to Ham Radio Deluxe and Commander can be safely ignored.

The following DLLs and EXE files are required and should be copied to the Multipsk directory:

  • mir_sdr_api.dll
  • msvcr100.dll
  • pthreadVCE2.dll
  • vcruntime140.dll
  • rsp_rcp.exe (thanks to F4FHH Nicolas and SDRplay)

For RSP2 users; by clicking on the "RSP2 bias-tee", the bias-tee (4.7 V / 100 mA max at the ANT-B antenna output) can be set (On) or reset (Off). Note that this option is not stored, so, you must manually set this option each time Multipsk is started.