> Is this roll-off similar to what other folks are seeing?
That is slightly less roll off than I see with either the FM (13 KHz) or 2.8 KHz filters in the data modes. It is in line with the 200 Hz cut off for data modes. In LSB/USB the low cut is less steep. In SSB it looks to be about 10 dB per octave below 300 Hz (-10 dB at 150 Hz, -20 dB at 75 Hz, -30 dB at 40 Hz) vs. 0.2 dB/Hz below 250 Hz in DATA modes. 73, ... Joe, W4TV On 9/7/2013 11:55 AM, Bob wrote:
My K3 is in the 61XX serial number range (almost 2 years old), and I'm running FW 4.67/2.81. While setting up WSJT-X, I've noticed a rather pronounced audio roll-off on the waterfall display. By other means I've verified that the sound card being used is flat down to below 20 Hz, so it isn't that. Assuming that it is an attribute of the K3 itself, things are flat down to 400 Hz. Then there is a -3 dB roll-off at 300 Hz, -10 dB at 200 Hz, and -20 dB at 100 Hz. At the moment, my widest filter is an 8-pole 2.8 KHz (A 6 KHz AM filter is on order), and it properly centered and wide open. Is this roll-off similar to what other folks are seeing? 73, Bob, WB4SON ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
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