User guide

MS-DMT Guide v1.04
Released 05-30-2014
59
The CheckSR program, upon startup selects the ”Default sound card” and 11025hz as the sample
rate. Select the Input and Output device of interest and 48000 for the test.
The resulting “Sample rate, Hz” must be less +/-5hz different from 48000Hz or the "Difference,
ppm" must be less than +/-100ppm at 48000Hz for the PC Sound Device to be usable at all with
this software and then only when the TX station is near 0.0ppm. In the example depicted above,
41ppm on RX is within usable tolerance and –111 on TX which is way out of tolerance for our
needs.
The software supports the 48K sample rate only at present. However 96kHz and perhaps 192kHz
may be supported in the future. Thus at some point, instead just using the pull down to select
the 48kHz sample rate, you can delete the default 11025 that comes up and enter any desired
sample rate manually.