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Copyright: 1996 - 2024
Webmaster:
Kirt Blattenberger,
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 typing 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:
AirplanesAndRockets.com
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Cool Products Archive - 11 |
Featured Product Archive
The inventions and products featured on these pages were chosen either for their
uniqueness in the RF engineering realm, or are simply awesome (or ridiculous) enough
to warrant an appearance.
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 Last
year there was story in IEEE's Spectrum of an engineer who strapped a GPS unit onto his cat,
Kookoo, to record its movement while being gone for days at a time. This Aiken Pet Social Interface is a
compact collar that integrates GPS and wireless connectivity. The makers claim that Fido's adventures can be
tracked real-time on his/her own Facebook page. A quick search did not turn up any actual examples. Other companies
such as SpotLight sell
equivalent devices for around $200US.
(P)MSNBC has an article showcasing other high-tech pet gizmos.
4-23-2010
 SparGraph
is new software that allows you to view your 2-port s-parameter (.s2p) files in graphical format. Contents of
multiple files can be displayed on the same charts for comparison. Codemeister Orla Sørensen is offering the
fruits of his labor for free, and promises more features if user feedback is strong enough. S-parameter de-embedding
(an oft-requested capability) is in the verification process now.
3-26-2010
 Die-Fi?
If you have a sizeable ego that causes you to believe you have a message that needs to be heard throughout eternity,
then Objecs has a deal for you - an NFC headstone tag! Granite headstones are durable, but there is only a limited
amount of space available for your cogitations to be inscribed. Future generations can simply place their near-field
communications devices next to the embedded tag and enrich their lives with your brilliance. From a practical
standpoint, this could be a method for leaving a death bed confession (might not
be admissible evidence) or a final dressing down to someone you always want to tell off.
2-26-2010
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 Many
households have no landline telephone - by choice. The ubiquity of cellphone service has negated the need for
such Alexander-Graham-era schemes. Dwellers of remote or mountainous realms are still tied to copper, but 90+%
of the world's civilized population lives within the reach of a cell tower. Because of obstacles and multipath,
signal strength can vary significantly from room to room, even enough to drop calls. What to do?
Airvana's HubBub CDMA is a "personal" mobile access point,
or femtocell access point. When deployed in homes and offices, it allows subscribers to use their existing
CDMA handsets in-building with "significantly improved" coverage and increased broadband wireless performance.
4-30-2010
 This is
not your father's Swiss Army Knife. (well, if you are one of my kids it might be).
Maker Victorinox has introduced a model with a Secure
Pro USB stick. It is equipped with both a fingerprint reader and a thermal scanner so even your cold, disembodied
fingertip won't fool it (spies take note). Like an
MI assignment player,
it will self-destruct if forced open. Available in 8, 16, and 32 GB versions. The downside is that thanks to
the people who brought us the 9/11 attack, you cannot take it on an airplane with you because it includes not
only an LED mini white light, a retractable ball point pen, a pair of scissors, a nail file, a screwdriver a
key ring, but a small knife blade... oh the horrors!
4-2-2010
 Not
everyone is a fan of everything with a name beginning with "i." This presentation compares the notable features
of an iPad with a rock. Undoubtedly part of the originator's motivation is to poke at the millions of people
who are fans of everything with a name that begins with an "i," but it is clever. The
iPad has received a lot of sycophantic press coverage
in advanced of its oft delayed planned release on April 3, 2010. The iPad ($499) is a head-to-head challenge
to Amazon.com's
Kindle ($260), which has enjoyed marginal success, and to a lesser extent Google's
Nexus ($700). Here is a
feature
comparison.
3-5-2010 |
 "Most
Unique Covert Tracker Antenna in the Industry." Mobile Mark's new patented GPS Multiband Antenna is hidden away
inside the vehicle license plate frame. The frame can house multiple antennas, including those for GPS, WiFi,
WiMAX, and Cellular channels (including LTE). The GPS band claims 5 dBi for the antenna and a 26 dB LNA, while
cell bands claim 2.5 dBi (no LNA). The specs do not indicate whether those numbers represent measurements in
free space or while actually mounted to a metal bumper. I suspect that the low position on a bumper, coupled
with the vehicle metal, will tend to make the operation highly directional.
5-7-2010
 Designing
a logo for your company can be a daunting - and expensive - part of
starting a business. Indeed, RF Cafe has been through many iterations in its 11 years.
Color, size, aspect ratio,
images, font, wording, and more all all part of what will become your company identity.
Inc. magazine
just published a very useful article on websites where you can have potentially thousands of freelance graphic
artists do the job for you based on a form you fill in. A "contest" format is used where you offer a price and
people submit designs. You pay when - and if - you see something you like. I have narrowed the RF Cafe logo
down to about 365 designs - one for each day of the year.
4-9-2010
 ISEE
has developed a compact, low-cost, robust 24 GHz radar sensor (ISM Band included) for automotive, industrial
or home applications. Consisting of a planar antenna, a 24 GHz front-end and an OMAP3530 processor unit for
signal processing, it measures distances (25 m ±20 mm typical), velocity or properties of objects with
 high
accuracy. The system uses a linear FM CW signal.
Lunar Lander X-Prize contestants
were all begging for something like this a couple years ago (I
know because I received many e-mails looking for such a product). Price is only 145€ ($200).
3-12-2010 |
 Here
is unique idea for a clock face. We RF engineers have our Smith Chart clock faces, but this Math Pop Quiz clock
is made to order for math geeks. Of course, engineers will appreciate it, so that's why it's listed now on RF
Cafe. I dare say a math theoretician probably would not have a clue about our
Smith Chart clocks. Here are some other
clock
designs.
5-14-2010
 Unless
you are a Ham radio operator, you might not be aware of the plethora high quality, low cost items available
from manufacturers that do not advertise in the professional trade magazines. I am referring mainly to things
like wall / window connector feed-through panels as pictured above that can be used for home brew shielded test
enclosures or to interface to environmental chambers. Isolation transformers for eliminating ground loops are
another good example. Prices are scaled to be within reach of Joe Sixpack, so your project manager will be happy.
Ask a nearby Amateur Radio guy/gal for last month's edition of
QST.
4-16-2010
 I'm
thinking maybe a line has been crossed here. I like a good cup o'joe pick-up as much as anyone, and don't mind
waiting a while for the caffeine to kick in. For those occasions when time is of the essence, there now is
Coffee LeWhif - a
inhaler. In fact, LeWhif is not even coffee - it is a concentrated 100 mg dose of caffeine (as much as a cup
of espresso) with either a chocolate or no flavor. As a bonus for the weight conscious, it has 0 calories. More
flavors are planned soon, as is an inhalable 3-course meal. I think the
Jetsons had those.
3-19-2010 |
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