I have an LNA that is powered via USB. I would like to use a spare SMArTee v2 dongle with it, but the bias-t cannot be turned off. Can the extra 5v input damage the LNA? I can buy a voltage block, but that defeats my purpose of using spare parts.
Nooelec Barebones Wideband LNA. It really needs external power because the RPi doesn’t have enough power to feed bias-t.
Use a DC blocker between SMArTee v2 dongle and the Coax from LNA.
The DC Blocker is basically a few hundred pF capacitor, put in series of the central wire of coax.
@abcd567 Thanks for the info.
Be careful. Some of the search result for DC Blocker at Amazon are Attenuators.
Nooelec has a DC block on their site for 20 bucks.
Quote from the Nooelec description page:
Each module allows for 3 different power options, but you should only power with one option at any given time!
I know about “should”. I was asking about “could”.