I tend to use the CWT display a lot, and then the S-meter doesn't show 20 dB over S9. Actively using RF gain, ATT, PRE, as one should, makes the S-meter even less interesting. Eyes tend to spend a lot of time on the P3 display when available. Spectrum peaks don't show how close we are to the maximum ADC input level. How about adding more information to the P3 display? Besides the existing display of the DSP bandwidth, the width of the roofing filter could also be shown in a similar way. And to address the hardware AGC function, how about some kind of vertical thermometer showing how close we are to it kicking in? Perhaps a horizontal line across the vertical bandwidth ribbon could show this, with the top of the bandwidth ribbon representing saturated ADC or hardware AGC activation. Just an idea.
73, Erik K7TV ---------------------------------------------------------------------------- --------------------------------- One problem here is that a lot of the discussion has been in analog terms. We have to remember that in the K3, the digital AGC controlled by the AGC parms is just that, a digital algorithm. What it does has nothing to do with diodes. It can do anything weird and completely non analog resembling, it only cares about the program code. The graphs I have seen are entirely based on steady or very slow moving signal states, not a photo of an audio rate amplitude varying signal traversing the AGC knee. They seem intended, well-enough done, just to convey the rudimentary function variants. You need to have the program code to estimate exactly what is happening to the AGC at audio rates. Good luck with that. The only control you have over the non parameterized hardware AGC is to reduce the gain in front of it so it isn't engaged. You can't turn it off, it's always potential if the signal coming through the roofing filter is getting up to around 20 over 9. If you have a pile-up of 20 over signals, it's time to turn off PRE, or turn on ATT, or back off the RF gain. Otherwise you are engaging the hardware AGC, not sophisticated, which is only there to properly range input to the ADC chip. This ain't your grand-daddy's analog radio. 73, Guy ______________________________________________________________ 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 Message delivered to arch...@mail-archive.com
