Nay, it was Professor Dumbledore of Hogwarts who did it. 
Hammer drill is not equal to hammer drill. There are drills which use a pneumatic piston for the hammering actions which is much more effective for concrete than the smaller hammer drills which rely on the operator pushing really hard while two discs rotate over each other and create small impacts.
If you donāt have a pneumatic one (only internally pneumatic they are still electric) then you are almost out of luck in good concrete.
Well, gettting back on topic for a necroād thread, but I needed some grounding advice.
Bad storm rolls thru and I lose a component. Two radios and now a pi with its power supply fried today.
Fortunately I have backups as my feeder does a lot of work in the DC area, but Iām curious if my attic install for antenna is causing havoc via induction when these lightning strikes hit.
Rtl sdr3 with line amp. 25ā run from antenna/amp with recommended wiring.
How do I keep from frying stuff? Fancy surge protector? Ethernet runs 1ā to a netgear Orbi satellite. My performance is amazing otherwise, being a top feeder worldwide.
Nearby lightning strikes create large potential differences between power circuits and āgroundā potentials. Is absolutely everything involved ā Raspberry Pi power supply, preamp power supply, Netgear Orbi, video monitor, etc. ā powered from a single, common, preferably surge protected, multi-outlet power strip connected to a single AC outlet?
If the preamp power is not injected into the coax, is there a separate 25ā power cable to the antenna/amp? If so, what kind of cable?
Is there any āgroundā connection at your attic antenna/preamp location? If so, I would remove it, as nearby lightning will create a large voltage difference between that āgroundā and the Raspberry Pi circuit āgroundā.
Orbi and Pi are on same receptacle. I am going to add surge protection ā¦surprisingly didnāt do that the first time and canāt remember why I didnāt.
LNA is @antenna with 25ā , power to coax injected thru rtl-sdr
Iām certain the outlet is grounded but the power to the pi is not a grounded transformer; itās their recommended PS. So grounding isnāt exactly there in this case.
As the Orbi has had no issue, I have to at least consider the entire length of wire is injected with current, via induction, which I believe you are addressing.
Sorry for the delayed response. Been a hectic few days. Thanks for the reply
Antenna related surges:
- Ground the antenna mast
- Install a Surge Protector in the coax, preferably before the coax enters the building
- Ground the Surge Protector body.
Power & Communication lines related surges:
- Install Surge Protector at AC mains power supply to the Power Supply Unit feeding RPi.
- Install Surge Protector on Internet cable to modem.
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