Copyright: 1996 - 2024
BSEE - KB3UON
RF Cafe began life in 1996 as "RF Tools" in an AOL screen name web space totaling
2 MB. Its primary purpose was to provide me with ready access to commonly needed
formulas and reference material while performing my work as an RF system and circuit
design engineer. The World Wide Web (Internet) was largely an unknown entity at
the time and bandwidth was a scarce commodity. Dial-up modems blazed along at 14.4 kbps
while tying up your telephone line, and a nice lady's voice announced "You've Got
Mail" when a new message arrived...
All trademarks, copyrights, patents, and other rights of ownership to images
and text used on the RF Cafe website are hereby acknowledged.
My Hobby Website:
RF shielding box - RF Cafe Forums
RF Cafe Forums closed its virtual doors in 2012 mainly due to other social media
platforms dominating public commenting venues. RF Cafe Forums began sometime around
August of 2003 and was quite well-attended for many years. By 2010, Facebook and
Twitter were overwhelmingly dominating online personal interaction, and RF Cafe
Forums activity dropped off precipitously. If the folks at
phpBB would release a version with integrated
sign-in from the major social media platforms, I would resurrect the RF Cafe Forums,
but until then it is probably not worth the effort. Regardless, there are still
lots of great posts in the archive that ware worth looking at.
Below are the old forum threads, including responses to the original posts.
|-- Amateur Radio
Gripes & Humor
-- CAE, CAD, &
Test & Measurement
Post subject: RF shielding Posted: Thu Sep 29, 2005
I am looking for a RF shielding box that can shield an opamp
ckt from high voltage and high RF (upto 100kw) interference.
put some aluminum tape over the plastic box. It helped a little, but
now it started to behave strangely.
What do u guys recommend
to shield the ckt and also shield the wires going into the ckt.
Post subject: ShieldingPosted:
Thu Sep 29, 2005 2:22 pm
There are several problems:
1. Do power
or signals have to pass through the shielding?
2. What frequencies
are you thinking about? (Magnetic shielding becomes difficult at low
3. What is the field strength at the box? 100kW within
6 inches is different from 100 kW 100 yards away.
4. Not all opamps
are equally resistant to RF.
Each of these has different implications.