Rick: > > Did you try chopping all the lows and boosting the highs in > the TX equalizer? It may not be broadcast quality audio > then, but that provides a lot more 'punch' in the audio, > which helps in DXing but not so much for the local chat nets > (then turn on ESSB too). Depending on your voice > characteristics, you might also want to boost the midrange. >
Yes, ad infinitum. Its not a frequency response thing, its a modulation density thing. Since the DSP "Processor" works akin to an RF Clipper (Or so Im told), input leveling is critical to raise the average power (decrease the ratio between peaks and valleys PRE-LIMITING) because this particular audio chain has a somewhat narrow band between clarity and distortion. See what you sound like if you increase the COMP setting beyond 25... Fuzzy, eh? With AGC leveling pre-limiter, I dont need to push the COMP beyond 20-22 at most. Denser, but less fuzzy, as I clip lesser amounts of the audio waveform. The COMP software doesnt have to hack off large chunks of overshooting levels to bring up the valleys, because the more you clip, the more distortion you add (I know its a digital process, but it SOUNDS like overruning the ADC to me, and digital audio is unforgiving when you overshoot the ADC threshold). AGC helps here to keep the signal in the sweet spot for the COMP algorythms. There seems to be a little AGC action in the rig's audio chain, but we dont have a handle for it and every voice and mic combination is different. Also, a little compression goes a long way in pre-conditioning a signal for later clipping, you dont want to get carried away by turning the knobs to 11. Compressing the voice waveform a bit, (I use 2:1) adding AGC to "level" the waveform then limiting the result of the compression increases modulation density and keeps the audio peaks and valleys within the DSP "window" for best performance (IMO, others will undoubtedly disagree!). Listen to your local AM Talk broadcaster critically (If you are in a larger market... Some of the small market guys sound like crap!) to understand the process. Or listen to a Kenny Chesney song, his engineers really do an outstanding job of making his voice stand out with both punch and clarity. Some of the best voice processing I have heard lately is on the Kenny Chesney song "I Go Back". Am I asking a lot from a Ham Rig's audio chain? Probably, but it never hurts to ask! > > Hint: If you have a P3, unplug the RS-232 connection(s) and > it will show you your audio during transmit. That way, you > don't have to trust your ears to make the adjustments in timbre. > Yes, I know that trick. There are others I have tried that use the P3 as a "off air" receiver as well. > Request (Wayne/Eric): Can we make the P3 have this ability > without unplugging the I/O? It's VERY handy to watch the > transmit audio. > I hear that this is in the works. -lu-W4LT- ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
