RTL-SDR Wideband LNA

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P-40 Warhawk
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Joined: Thu Jun 26, 2014 11:55 pm

RTL-SDR Wideband LNA

Post by P-40 Warhawk » Sat Apr 27, 2019 1:42 pm

Hi .
At the first week April we had a bad storm come through were I live and the lighting took out the RTL-SDR Wideband LNA that I had . The ESD NOTE:that is in the information about the LNA states that the antenna needs to be grounded . Now my antenna is a diskcone and it is under the roof of my house and the cox shield is grounded . The question is , is this the kind of ground that you are taking about in the ESD NOTEs . If not , than what kind of ground did you mean ?????????

rtlsdrblog
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Re: RTL-SDR Wideband LNA

Post by rtlsdrblog » Sun Apr 28, 2019 3:13 am

How have you grounded the coax? The ground of the antenna or the mast connected to the ground of the antenna should also ideally be grounded.

When you put an LNA right up at the antenna it's more susceptible to ESD. So the antenna should be grounded sufficiently, otherwise the ESD protection diode and GDT can't work properly.

But if it was a nearby lightning strike, probably nothing could save it then.

P-40 Warhawk
Posts: 84
Joined: Thu Jun 26, 2014 11:55 pm

Re: RTL-SDR Wideband LNA

Post by P-40 Warhawk » Sun Apr 28, 2019 11:57 am

Good morning.
What I have is a ten foot ground rod down in the ground and the cox cable shield is connected to it . The lighting bolt went right by my window, it took out ten blocks of Cox cable service , my cable modem , my satellite receiver , Airspy HF+ , the V3 dongle and , Wideband LNA , last of all my flat screen TV . Well as casual observer I would say that the lightning was close enough .
Well have a good day over their .

rtlsdrblog
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Re: RTL-SDR Wideband LNA

Post by rtlsdrblog » Sun Apr 28, 2019 11:54 pm

Ouch...yeah a lightning bolt that close would simply eat through any electronic devices nearby. Your grounding is probably okay for ESD, but not lightning.

If you had an outside antenna that was grounded really well, the lightning might have actually gone there and protected your other stuff. Hard to know though.

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