WiNRADiO G65DDC User’s Guide
17
Avoiding Front-End Overload
If you are tuned to the HF bands and the S-meter shows the words
ADC CLP
,
the analog-to-digital converter (ADC) is overloaded (i.e. clipping the signal). In
such a case, use the
Attenuator
to reduce the level of the signal entering the
ADC. You can use the
Auto
button which reduces the signal automatically to
the optimum level.
If you experience any installation problems or are unable to tune to any radio
stations at this point, please refer to
Appendix B - Troubleshooting
.
Should you encounter interference-related problems with your receiver,
effective remedies do exist; please peruse
Appendix D – Dealing with
Interference
.
Inside the Excalibur Sigma
Let’s have a look at what’s inside this receiver and how it relates to the
graphical user interface of the control application. Here is a simplified
functional block diagram of the hardware portion of the receiver:
The receiver operates in two separate frequency ranges:
Range 1
from 1 kHz
to 88 MHz and
Range 2
from 118 MHz to 190 MHz.
There are two antenna inputs on the receiver, for each of its respective
frequency ranges. Both antenna inputs are followed by a dedicated signal
chain for its frequency range.
For
frequency range 1
the signal chain starts with the antenna input and its
associated protective and impedance matching circuitry, followed by the
Preselector and the Attenuator.
