--- In [email protected], "Roger J. Buffington" <[EMAIL PROTECTED]> wrote: > > mulveyraa2 wrote: > > > > > Are you using the mechanical filters, the DSP filters, or both? > > > > Particularly for digital modes, the mechanical filters will make a > > world of difference, since they'll be reducing the passband width - a > > necessity in crowded conditions, or when a strong station is causing > > the AGC to pump. > Precisely my point. I find that the Mark V's 250hz and 500hz filters > are most useful for digital. For the reason you give: the filter > prevents AGC desensitization of a weak signal you are trying to copy by > a nearby stronger signal. So, to answer your question, the mechanical > filters are most valuable. >
Well, the question was directed at John, actually, in response to Simon's comments. ;-) I am surprised at how many digital ops seem to run rigs without IF filters - even on rigs that can accomodate them. It seems like everyone wants to see the entire 2.8khz passband at once, even while in a QSO. It makes far more sense to use the whole passband when you're looking for a QSO, and then cranking in the IF filter once you've established a contact. I use MixW, for example, and have a macro that will instantly center the signal I'm looking for in the middle of the passband, and then engage the 270hz filter. When I'm done with the QSO, another macro opens it up again. I presume most other digital soundcard software permits the same functionality. - Rich
