At 3/15/2007 20:18, you wrote: >Yes, you have to make all the audio preemphasized (from the autopatch IF >USED) to match the user's audio which is preemphasized. I would not >phrase it as "put de-emphasis on this & that & pre-emphasis & that & the >other" since that also describes processed audio systems. > >In most current configurations, this involves simply de-emph on the DTMF >decoder (simple enough) which is the same thing you would do with the >receiver in a processed audio system, so it's actually much easier than >in an unprocessed audio system (half the work). > >Modern ham controllers even have that built in as a jumper option, so >it's not as difficult as "put de-emphasis on this & that & pre-emphasis >& that & the other" - it's more like "install jumpers 1, 2, and 3 in the >A position during setup if you have autopatch or install jumper 1 in the >A position if you don't have autopatch."
All my controllers, which are admittedly not very current, only have de-emphasis jumpers on the radio port inputs. They are designed for flat response audio running through the controller. I guess in some ways it just boils down to personal preference. I just find it easier to work with controller audio that matches the original/final audio. As others have pointed out, running 6 dB/octave pre-emphasis through a controller puts additional dynamic range requirements on its audio circuitry. Of course, all this will be moot when we all switch to DSP controllers (see LinkComm's recent announcement regarding a possible debut @ Dayton). Bob NO6B
