QMSIM 4.0 could be downloaded from the developer's website when we last checked. We cannot confirm if there is a free download of this software available. Commonly, this program's installer has the following filenames: QMSIM.exe and QMSim16.exe etc. QMSIM is categorized as Education Tools.
This free tool was originally developed by Polyphase Microwave. We cannot guarantee that the program is safe to download as it will be downloaded from the developer's website. Before launching the program, check it with any free antivirus software. This free PC software is compatible with Windows XP/7/8/10/11 environment, 64-bit version. The following version: 4.0 is the most frequently downloaded one by the program users.
From the developer:
Quadrature modulators generate any bandpass RF modulation including QPSK, QAM, OFDM, FM, PM, AM, and pulsed Doppler. I and Q baseband inputs directly modulate the LO input to generate a modulated RF output.
AM series modulators use active designs with superior linearity and have integrated LO amplifiers. QM series modulators are passive for the lowest output noise.
You may want to check out more software, such as Arcus - Rubik's Cube Simulator, Leica emScon Client Software or Dolphin Guide, which might be related to QMSIM.