u/Impossible-Stage-283

Hi everyone

I wanted to buy an RTL-SDR V4 to build a 1420 MHz radio telescope, but it's out of stock

I want to use Nooelec Sawbird+ H1 as the LNA. I have to power it using Bias-T or a micro USB cable and a powerbank. If the micro USB doesn't cause noise/RFI, I want to buy an NESDR which doesn't have a Bias-T feature. If micro USB causes noise/RFI, probably I should buy RTL-SDR V3, because it has Bias-T

I'm not sure which option and SDR is better, I'd really appreciate your help