I have received the 1090MHz triple filtered LNA from rtl-sdr blog, because I want to experiment replacing my no-name dual eBay special filtered LNA.
Being prudent, I open the shell to check if it wasn’t installed backwards… it can happen.
Well, it was installed correct, but on a cursive analysis looks like it can be fitted with a voltage stabilizer to power the preamp. Right now there is nothing there, and a 0 ohm resistor passes the power directly to the chip, but… for my cable length I am worried of the voltage drop.
And I definitely wary to use the Bias-T inside my Airspy Mini to feed this (I have an external bias-t right now that I can use).
Now I am contemplating to solder the stabilizer on the board… after I check functionality as is of course. The datasheet says that max voltage is 5.5V, so a 5V stabilizer IC should be perfect. Like LT1118CST-5.
Am I overthinking this?
The board with the open pads for the voltage IC on top-right:
Looks like the SAW filters it uses are 8MHz wide? I can’t find a good cutsheet…
For reference, this is what I am using now:
My present SAW filters are 30MHz wide.