Birdog USB Plus Satellite Meter Signal Locator 4.0 SWM Compatible Spectrum Analyzer - Clear and easy to use.To align the integrated SWM LNBs (SL5S or SL3S) with a Birdog meter, you must use a single port power passing splitter, rated at least 2mHz to 2150mHz, or you can use the DTV ASL tool. Connect the SWM power inserter to the power passing port of the splitter/ASL, connect the Birdog to the non-power passing port. QPSK constellation diagram - Detailed diagnosis of digital satellite signals Custom Carrier - Create your own file while on site and see it 'lock' LNB / cable test - Measure for open or short circuit in LNB & cableit is compatible with swm lnbf but you need a swm 2-way dc pass slitter to power lnbf up with 21 volts swm power supply and second leg to connect birdog usb plus. Dual display for DTV 101/119 - See two satellites at one time, also works with SWM