Sound card rtty windows#
If the audio coming from the accessory jack is at a constant level, you can still adjust the level to the input of the sound card through the Windows Recording control in most cases. Getting the audio from an accessory jack usual works well, especially if you can vary the level of that audio with a menu command on your radio. You could get the audio from an accessory jack or come straight from the PHONES plug or from an external audio filter that you may already be using. There are several ways to derive audio from your transceiver. The radio end of the cable requires a little thought. This is selected in MMTTY under Options, Setup MMTTY on the Misc tab. In MMTTY you can use left channel, right channel or mono. In any case, it’s best to use shielded cable in an attempt to keep RF off the audio line. You could use a mono plug regardless of whether your Sound Card is stereo or mono. Normally, tip is left channel, ring is right channel and sleeve is common or ground. You can use the ring if you like, but if your Sound Card is mono, it won’t work. Use the tip pin for your audio and the sleeve for your ground and shield. This is a stereo plug with tip, ring and sleeve. In most cases, the plug required is a 1/8″ (3.5mm) phone plug (Radio Shack p/n 274-284). More than likely, it will be a stereo sound card. Your sound card will be either stereo or mono. The computer end of the cable is pretty simple. Here is a diagram showing the connection. The most popular transformer used for this application is the Radio Shack audio isolation transformer part number 273-1374 (note: this part is no longer available from Radio Shack). When we get to the transmit part of RTTY, and if you decide to use AFSK transmission, you will also want to put the same type audio transformer between the audio output of the Sound Card and the audio input of your radio. Although this is not absolutely necessary, it is good practice. You can go directly from radio to sound card, but it’s always a good idea to put an audio transformer in line between your radio and sound card for isolation. The basic idea is to come from the audio output of your radio and go to the audio input of your sound card.
These interfaces are covered in more detail on page. Many operators use commercially made interfaces such as a MicroHam microKEYER or DIGI-Keyer, West Mountain Radio RIGblaster, MFJ Sound Card Interface or Bux Comm Rascal to connect the sound card to the radio.
You’ll need to buy or make a cable in order to do this. Hooking up the Sound Card to your radio to receive RTTY is pretty easy.
0 kommentar(er)
