ADC overload
The top right of the S-meter shows a red "OV" indicator when ADC overflow/overload is detected. Tests with a signal generator show the ADC overflows when a single-tone exceeding -15 dBm (almost S9+60) appears on the antenna terminals.
If you're in Europe be careful about ADC overload in the early evening from the gigantic SWBC transmitters nearby. It can also occur from very strong local AM MW BCB signals. Use a smaller antenna or an inline attenuator if necessary. An attenuator can be as simple as a low-value potentiometer. Sure, the pot won't maintain a 50 ohm impedance like a proper Pi-network, but this is not critical. Adjust the pot until the overall waterfall noise floor drops to normal under high-signal conditions (roughly -100 to -130 dBFS shown on the spectrum display when fully zoomed in on a quiet frequency). Or until the "OV" indicator no longer shows.
看来我们的KIWI要加衰减器才行了。长期输入过载了。
可能是7MHZ等几个广播电台频段造成的。
[ 此帖被BA7KW在2016-12-20 20:47重新编辑 ]
