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RTL-SDR Wideband LNA

Posted: Fri May 10, 2019 10:54 am
by phil
My second LNA has now failed. Strange thing is, it's only started happening since i connected them to a discone! They both ran quite happily on custom 150MHz Dipole, 450 MHz 1/4 wave and 1090 MHz 1/4 wave antennas. Any thoughts on what is happening?
My theory is that the the discone is wideband enough pull a lot more static. Is that possible?
Can i repair the LNAs or do i buy 2 more and scrap the discone?

Re: RTL-SDR Wideband LNA

Posted: Sat May 11, 2019 4:50 am
by rtlsdrblog
Is your Discone grounded?

It's most likely that the SPF5189Z chip died due to ESD. If you can replace that chip it should work again.

Re: RTL-SDR Wideband LNA

Posted: Sun May 12, 2019 12:25 am
by phil
The Discone is grounded to the same earth stake as the other antennas mentioned. I've since pulled it down and packed it away. I think i'm lucky that only the LNA units were damaged and not my more expensive SDRs. Looking at the price of the SPF5189Z chips, it's not worth replacing them. I have no issue buying a couple more LNAs, they have been very good units. Thanks!