[digitalradio] Re: center of the waterfall question

2007-10-01 Thread Dave Bernstein
Whether you find an interesting signal by clicking on traces in a panoramic tuning display or by rotating your tranceiver's tuning dial, ideally you should then direct your digital mode application to place the selected signal at a pre-specified optimal audio offset by appropriately QSYing

Re: [digitalradio] Re: center of the waterfall question

2007-10-01 Thread Roger J. Buffington
Dave Bernstein wrote: Whether you find an interesting signal by clicking on traces in a panoramic tuning display or by rotating your tranceiver's tuning dial, ideally you should then direct your digital mode application to place the selected signal at a pre-specified optimal audio offset

Re: [digitalradio] Re: center of the waterfall question

2007-09-30 Thread Robert Thompson
Additionally, depending on the filters, the signal may be distorted enough to impact its decodability despite favorable SNR. Usually by the time this is a serious factor, the actual passed signal is obviously too far down, but I've seen it happen once well within the passband of a particularly

[digitalradio] Re: center of the waterfall question

2007-09-28 Thread Dave Bernstein
There are two considerations: 1. the signal being decoded should fall within the receive filter(s) you're using. Some ops activate RTTY or CW filters during PSK QSOs; their choise of offset is thus limited by the positioning of these filters within their receiver's bandpass. 2. the second