You’ve done it! You’re decoding using DSD…pretty neat, huh? Now you can get into some more sophisticated options such as recording audio to a file for unattended monitoring and later playback...
Note with the above I’m running DSD to decode just positive polarity MotoTrbo/DMR signals and I’m saving all of the audio to a file named 011712.wav. This file will be saved directly into the DSD folder where I can double click on it from My Computer or Windows Explorer and have it open in my default audio playback program.Occasional Audio “Oddities”
From time to time you may notice a brief “blurb” of unintelligible audio emanating from your PC’s speakers. This seems to be a normal trait of DSD, and it will almost always appear in conjunction with a “non-standard” display on the screen. For example, despite the fact that I’m telling DSD to decode only positive polarity MotoTrbo/DMR it may suddenly show a P25 signal, or an X2-TDMA signal. These are “phantom artifacts” for lack of a better description. You’ll notice them as well if you play back your audio file. No worries, the real audio will be recorded fine and you’ll certainly hear it clearly if you’ve reached this point of the tutorial successfully.A Little More on Discriminator Taps
Some receivers are equipped out of the box with discriminator taps. I have used an Icom IC-R1500 receiver with great success with DSD. But, every scanner I have built a tap into has had the aforementioned 10k ohm resistor built in. Straight taps have not worked for me very well, but if you’re not sure spend the $2.00 or so at Radio Shack and build an external cable with one built into the “hot” side. From what I’ve seen this works just as well as having the resistor on board, and unless I’m sadly mistaken it can’t hurt anything being inline.Disclaimer
As always, any modifications are done at your own risk and peril and shan’t be laid at the feet of yours truly or the DSD creators (heck, you won’t find them anyway! )
I hope this has served in some small way to help some of you get started on this project. I will continue to partake in the threads at Radio Reference and at my website pertinent to DSD, but I’m not available for “support”. This tutorial in most cases should get you started. Best of luck, and enjoy!
Oh, one more thing. This document can be freely distributed to all corners of the planet and beyond, just be kind and list Scott from Scan New England as its source, and of course give plenty of love to the creator of the software, and the fine gentleman that ported it to Windows. Thanks!