November 18th, 2018: The Lime options are now shown in the Receive DSP panel instead of the ribbon bar.
The options are:
At the bottom you see the chip temperature, TX drive level and TX peak input since the last update (usually one update per second).
Selecting More opens the advanced options display.
The Antennas window shows the frequency range assigned to the antennas by the Lime support library, this information does not reflect any hardware changes.
Calibration reduces a spur in the center of the display and strong signal images, both for receive and transmit. It is only possible to calibrate the Lime system once it has been started and running for about one second. Calibration values are restored whenever possible.
Note: calibration is part of the Lime support library. When you press RX Calib / TX Calib and the receive gain / transmit drive is too low then an error is displayed. When calibration runs automatically any error is suppressed.
Calibration runs after data has been streaming for the selected number of seconds. You will normally see a small interruption in the waterfall.
Transmit Offset Frequency
To avoid a spur in the center of the transmission bandwidth, offset tuning is supported. A downside of offset tuning is possible 'ghost' carriers if the transmit calibration has not been run.
Monitoring Your Transmission
The only way to reliably monitor your transmission is with another receiver as there is a lot of leakage between the transmit and receive parts of the Lime chip, so what you see on the waterfall while transmitting may not necessarily be the same signal that is sent to the antenna.
Displays the hardware clocks, enables external reference options.
Optionally save the settings file when the Lime SDR is closed, this is for development use only and will be removed in a future release.
Enable the analog and digital filters, by default these are enabled (recommended).
Primarilly for development use, ths enables the level of diagnostic information returned by the Lime support library.
To reduce the spur seen in the centre of the display there are two options: Firmware and Software. The software option is usally better than firmware. Gain and Phase correction are usually enabled.
These options are usually enabled.
Disable the transmitter while in receive. Even when not sending and data the transmitter is till active unless disabled, so it is advisable to disable the transmitter while in receive.
Used for debelopment / test purposes, specify a .ini file with pre-defined values. These .ini files are usually created with the limeSuite GUI.