PULVERDAMPF

Revierler hat geschrieben:ich verstehe die Diskussion hier nicht wenn ein Aimpoint eine Batterielaufzeit von 30000 Stunden hat dann lasse ich es einfach durchgehend eingeschaltet und wechsle alle zwei Jahre mal die Batterie zum Beispiel beim M4 eine simple AA Batterie

granatapfel hat geschrieben:AA Batterien sind auch bei einer Zombieapokalypse kein Problem. Ich sage nur Eneloop, Ladegerät und Solarpanele

The simple answer is virtually no red-dot rifle sight will be negatively effected by high altitude EMP. Buy any red-dot you like with full confidence and expectation that it will continue to function in a post-EMP world.

Lets go with the longer answer. The atmosphere attenuates most energy above around 150 to maybe 200 Mhz (it's a gradual thing), with a spike in the infrared/visible light/ultraviolet spectrum.

To receive significant amounts of energy you have to have an appropriate receptor for the wavelength you're dealing with. We're ultimately only worried about the stuff 150 Mhz and below, roughly the 2 meter range. Effective receivers are going to be 1/4th wavelength, or about .5 meters (~1.6 feet). So the concerns are unshielded coils, other wires, or circuit board traces, conservatively, 1.3 feet or longer in length. All FM radios fit the bill of a vulnerable compact electrical device.

It's entirely impossible to predict exactly which devices are vulnerable and which aren't without a complete investigation of the board construction and a part list, and even then there are some not entirely predictable effects from construction variances, coupling, case construction, etc. But suffice it to say that most electronics, especially small battery powered electronics, are probably not vulnerable when you don't have wires hanging off them to act as receptors. Including up to laptop size devices and UHF radios, I wouldn't be surprised to see many unprotected laptops and UHF radios working after an EMP if they weren't plugged in at the time. Though I would protect a laptop or radio I wanted to work if I anticipated an high altitude EMP, personally. I wouldn't worry about my red dot or mp3 player short of unplugging the headphones.

Yes, this is contrary to much of the common lore out there, but there you have a reasonably well researched guess. If it runs on a battery, it may well live.

Qualifications: I have a bachelors of science degree, I work at a company that builds RF communication equipment, and I have read the public EMP reports.

Disclaimer: I am not a RF or an antenna engineer, so while I'm exposed to the concepts - it is not my bread and butter training even though I'm playing one right now, nor am I directly privy to military EMP testing. This is "best guess" from my available information. My liabilities to any decision you make based upon it are limited to what you paid me for this information.