Does it natively support active antennas without using a Bias-T?

No, not on this particular model. A native bias-tee of any sort will cause loss (reduction in sensitivity), regardless of design. As such, our general recommendation is to use a well-designed external bias tee whenever possible--as it can be completely removed from circuit when not needed. If impossible, or if your budget will not permit such a solution, the next best thing is having 2 SDRs, one with an active or switchable native bias-tee and one completely without such a circuit for passive antennas. Of course, if you are planning on only EVER using an active antenna with your SDR, an always-on or switchable bias-t is just fine :)Hope this helps! Please feel free to reach out to us any time with questions or concerns, and thank you for your support

Does it need driver files for Window notebook? If so, where can I get the driver?

A file named zadig appears to be magic in getting RTLSDR up and running. I just had to go back thru this again when I tried to fire up my RTL system for the first time in maybe six months. Do a web search for "zadig" and download the file from one of the sources (not many). Open it up and run the zadig.exe file. The hard part is getting the right configurations into thr zadig window. Then hit the "replace file" button. If you got it right, things should start working. I'm sure you can find more detailed and complete guidance from some web sights, in particular RTLSDR.com, but this gives you the general idea. Good luck with it - the SMArt makes quite a nice little shortwave radio with with an HF upconverter feeding the SMArt.

If I want to listen to trunked P25 or trunked DMR, are two dongles required?

Yes, you can use ONE sdr now to listen to P25 phase I and phase ii. How it works is the dongle will monitor the control channel and the transmission channel within the bandwidth of the sdr. You will get better and more calls with 2 sdrs. The key is to find the frequency of the P25 system you want to monitor and build a good antenna for it, get it elevated.

ASIN	B01HA642SW
Best Sellers Rank	#7,596 in Computer Accessories & Peripherals
Brand Name	NooElec
Color Name	black
Customer Reviews	4.5 4.5 out of 5 stars (2,696)
Date First Available	July 10, 2016
Is Discontinued By Manufacturer	No
Item Weight	1.06 ounces
Item model number	NESDR SMArt SDR
Product Dimensions	3.54 x 0.39 x 0.39 inches

Nooelec RTL-SDR v5 SDR - NESDR Smart HF/VHF/UHF (100kHz-1.75GHz) Software Defined Radio. Premium RTLSDR w/ 0.5PPM TCXO, SMA Input & Aluminum Enclosure. RTL2832U & R820T2 (R860)-Based Radio

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