On 7/15/2012 12:15 AM, Edward R. Cole wrote: > I rarely listen to the audio of digital signals since my brain cannot > decode them, anyway. With a 3.5mm phone plug inserted the internal > speaker is disconnected so I suppose you are using either headphones > or ext. speaker. No need to hear the signal so volume on KX3 is > adequate to set proper level for digital sw.
I operate RTTY, JT65, FSK441, and ISCAT fairly often, and I've just started with PSK2K. I find it VERY useful, even IMPORTANT to listen to what the decoder is seeing. I get close to "right" tuning on RTTY by ear, then tweak it with the display. When using FSK441 to work meteor scatter I'll hear a ping and know to be looking for it. Likewise with JT65 and ISCAT I'll be able to hear most of the signals that can be decoded, as well as noise and QRM. And when using some of these modes on a band with little activity (like 6M, or 160M during the summer) I'll be CQing beacon-style while doing something around the shack. Hearing a signal pulls me back to the operating desk. There are at least a half dozen other digital modes in use, and with some you almost need to hear them to recognize which decoding program to use. :) >Audio interface should use isolation transformers, and the mic audio >requires a pot for setting proper modulation level Both statements are absolutely untrue. I've shown how proper chassis-to-chassis bonding prevents hum and buzz from power-related leakage currents, and it is trivially easy to set audio level using a combination of the output controls on the computer sound card and the mic gain on the radio. 73, Jim K9YC ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
