[amsat-bb] Re: Safekeep Sat Radios
John B. Stephensen
kd6ozh at comcast.net
Sat Dec 15 15:14:11 PST 2007
Just use good lightng arrestors -- many will protect against EMP. Of course,
since EMP is generated by exploding a bomb in the stratosphere, we don't
have to worry about this in terrorist attacks.
----- Original Message -----
From: "Edward Cole" <kl7uw at acsalaska.net>
To: "Bruce Bostwick" <lihan161051 at sbcglobal.net>; <amsat-bb at amsat.org>
Sent: Saturday, December 15, 2007 07:39 UTC
Subject: [amsat-bb] Re: Safekeep Sat Radios
> Put all those old FT-101E's to bed!
> If there is a limited nuclear EMP then probably gov't is
> non-functional like Katrina!
> All out Nuclear exchange...pray there is anyone left to talk to.
> At 07:17 AM 12/14/2007, Bruce Bostwick wrote:
>>As I understand it, any equipment you want to survive an EMP had
>>better be inside a Faraday cage that's actually a solid electrically
>>conducting case with no gaps. The ideal would be a packing crate
>>sheathed in copper and soldered shut, not sure if you'd have to go all
>>the way to that extreme or if a tight fitting copper lid would be OK
>>(I'm sure there's been military research done on exactly how tight the
>>seal would need to be). I'm pretty sure that lead-acid wet plate
>>batteries would survive an EMP OK, most of what seems to get fried in
>>EMP events is wire coils and semiconductor junctions due to the
>>enormous induced voltages (a good sized spool of wire in the crate
>>wouldn't be a bad idea, spooled up wire exposed to an EMP tends to
>>fuse into a solid block of copper if I remember corrrectly).
>>I'd say enough space to house a more or less universal Extra-class
>>coverage HF radio, a versatile and low loss antenna tuner that can
>>load up whatever you can scrounge (probably a random wire or dipole),
>>and a good sized spool of suitable antenna wire if you can fit it in
>>there, and count on leaving this setup packed away ready for use at
>>all times (i.e. treat it as "emergency use only" and don't be tempted
>>to dig it out and put it in the shack except for periodic
>>functionality tests). Probably better to use a less feature-rich but
>>more rugged radio that will get you on the air with just the basics,
>>to reduce the temptation. :)
>>I wouldn't count on there being too many people out there to talk to
>>after an EMP event, though, and I'd expect there to be really tight
>>restrictions on who was and was not allowed to transmit even on ham
>>frequencies for some time afterward. So having a working transceiver
>>may be of very limited use unless you're on record as belonging to a
>>local ARES chapter and are handling disaster relief traffic ..
>>On Dec 14, 2007, at 1:11 AM, sco at sco-inc.com wrote:
>> > Has anyone thought about the idea/need/way to safeguard a few ham
>> > radio sets in an area in case of EMP? A nuclear device set off above
>> > ground will wipe out all modern electronics (ham sat radios) within a
>> > large distance from the epicenter. Even if the radios are outside the
>> > blast and radiation areas they would be useless because of the EMP
>> > (electro magnetic pulse). I would think that HS might be willing to
>> > fund a way to create some safe rooms to store some ham gear around
>> > the country. Perhaps even a large "safe box"? Ham satellite gear
>> > should be in this category.
>> > Les W4SCO
>>HAH, YES. HE ACTUALLY SAYS IN HIS LETTER, "I BET YOU DON'T EXIST 'COS
>>EVERYONE KNOWS ITS YORE PARENTS." OH YES, said Death, with what almost
>>sounded like sarcasm, I'M SURE HIS PARENTS ARE JUST IMPATIENT TO BANG
>>THEIR ELBOWS IN TWELVE FEET OF NARROW UNSWEPT CHIMNEY, I DON'T THINK.
>>(: HAPPY HOGSWATCH :)
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> Ed - KL7UW
> BP40IQ 50-MHz - 10-GHz www.kl7uw.com
> 144-EME: FT-847, mgf-1801, 4x-xpol-20, 185w
> DUBUS Magazine USA Rep dubususa at hotmail.com
> Sent via AMSAT-BB at amsat.org. Opinions expressed are those of the author.
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