In article ,
says...

... The ARRL (amateur radio organization)
got permission to test some typical amateur radio installations in the
simulator. They found damage to the front ends of HF transceivers
when connected to 80 m halfwave dipole antennas (about 136 feet),
but no damage at all to handheld transceivers and auto mounted
VHF mobile rigs when the exposed wiring lengths did not exceed
1 meter.

Which means your rig is safe as long as the 80 m dipole
is disconnected when not in use.

Note, though, that the possibility of damage to the power grid, and the
telecommunications networks, is very real. That's because they have
a huge amount of exposed wiring to act as antennas, so their capture
area for the NEMP energy is also huge. So they have to take extraordinary
measures to protect connected equipment against EMP. These measures
include wiring practices, use of single point grounds, gas discharge shunt
protectors, etc.

None of that is a concern for electronics which is not connected to exposed
wiring which can form an antenna with a large capture area, however. It simply
intercepts too little energy from the pulse to do any damage.

Ah. But then, isn't most consumer electonics connected to the
power lines? And as such, susceptible to common-mode signals
arriving on them? Granted there will be a lot of attenuation
on the incoming service entrance, but there's a lot more than
40 meters of wire hooked up to any house that you pick at
random, for the most part.

Jim

==================================================
please reply to:
JRR(zero) at yktvmv (dot) vnet (dot) ibm (dot) com
==================================================