Using WSPR on Microsoft Windows XP, Vista, or Windows 7

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Revision as of 13:08, 27 October 2010 by W9KFB (Talk | contribs) (Added traditional audio in and out should be tried first)

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WSPR 2.1 Overview

WSPR 2.1 is the latest version WSPR, the “Weak Signal Propagation Reporter.” It differs from WSPR 2.0 by including support for software defined radios (SDRs) like the HPSDR/PowerSDR rig. With I/Q mode enabled, the program uses 2-channel sampling at 48000 Hz for both input and output. Your HPSDR PowerSDR sends I and Q baseband signals to the WSPR 2.1 input; the WSPR2.1 audio output, also in I/Q format, goes to the HPSDR PowerSDR Tx audio port. T/R switching is accomplished via a virtual serial port. You will need Virtual Audio Cables and Virtual Serial Ports to finish the implementation. Experience has indicated that the traditional audio in and out should be tried first to establish a performance baseline before the I/Q implementation is attempted.


1.0 WSPR 2.1 can be downloaded from the WSJT Home Page. Click on the WSPR link at the left margin and then on the appropriate download link. Install the program in the usual way for your operating system. Under Windows, execute the downloaded file and follow the installation instructions. During a test period you may wish to have both WSPR 2.0 and WSPR 2.1 available on your computer; in this case you should install WSPR 2.1 in a new directory, for example the Windows folder C:\HamRadio\WSPR21. (In the Vista or Windows 7 operating systems, if you use the default location C:\Program Files\WSPR you may need to set some access permissions explicitly.)

2. Install at least two sets of com0com ports for use with PTT and frequency control. Learn about and install com0com.

3. Download and follow the latest version of the Set-Up instructions from the JT65HF Setup and Use Guide.

a. Before testing the PTT button, be sure that "DTR" is checked. The alternative PTT method is not required.

b. For best decoding of weak signals, PowerSDR's AGC should be set to custom and the AGC-T adjusted for 0dB audio input level.

4. Install Virtual Audio Cable (VAC). Follow FlexRadio instructions at: How to Setup Virtual Audio Cable (VAC) 4.0x with PowerSDR 1.x

5. Change the calibration values as described in the FlexRadio Knowledge Base article:How to Configure WSJT with PowerSDR and VAC

6. Frequency and band changes are still done manually at this date.