RF Cafe Software

RF Cascade Workbook 2005 - RF Cafe
RF Cascade Workbook

Calculator Workbook
RF Workbench
Smith Chart™ for Visio
Smith Chart™ for Excel
RF & EE Symbols Word
RF Stencils for Visio

About RF Cafe

Kirt Blattenberger - RF Cafe WebmasterCopyright
1996 - 2016
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 Internet was still largely an unknown entity at the time and not much was available in the form of WYSIWYG ...

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

Try Using SEARCH
to Find What You Need. 
There are 1,000s of Pages Indexed on RF Cafe !

Electronics World Cover,TOC,and list of posted Popular Electronics articles QST Radio & TV News Radio-Craft Radio-Electronics Short Wave Craft Wireless World About RF Cafe RF Cafe Homepage RF Cafe in Morse Code Google Search of RF Cafe website Sitemap Electronics Equations Mathematics Equations Equations physics Manufacturers & distributors Engineer Jobs Twitter LinkedIn Crosswords Engineering Humor Kirt's Cogitations Engineering Event Calendar RF Engineering Quizzes AN/MPN-14 Radar 5CCG Notable Quotes App Notes Calculators Education Magazines Software,T-Shirts,Coffee Mugs Articles - submitted by RF Cafe visitors Simulators Technical Writings RF Cafe Archives Test Notes RF Cascade Workbook RF Stencils for Visio Shapes for Word Thank you for visiting RF Cafe!

Spektrum Wireless Telemetry System
Cool Product Report

Spektrum Wireless Telemetry System - RF Cafe Cool ProductApps for smartphones are all the rage. Many product manufacturers are providing apps as part of the package. What makes this particular app cool is that it is part of a wireless telemetry system offered for remote controlled models. It used to be that a modeler was satisfied just to have reliable communications from his transmitter to his airborne receiver. That is especially true these days when the total value of an airplane, engine, and associated hardware can easily exceed $2,000. The guys who build incredibly detailed scale aircraft that reflect many hundreds of Spektrum 12X 2.4GHz A/S/H - RF Cafehours of building, painting, and detailing a WWII era B-17 bomber or a twin-turbine F-15 model put it all on the line the moment the plane is put in motion. Any failure of the receiver to properly decode the transmitter's signal can - and often does - result in total loss of all their effort. RF interference has in the past been the most prominent cause, either from nearby unintentional radiators or from dopes who switch on their transmitter operating on the same channel (the FCC reserves 50 frequencies exclusively for airborne R/C).

Fortunately for the modeling community, sometime around the turn of the century (21st, not 20th) some smart engineers figured out how to build reliable radio control systems that operate in the 2.4 GHz ISM band using spread spectrum modulation. The quantum barrier to be tunneled over/around was sufficient range while keeping within the FCC's maximum power output specification. Redundant receivers with separate, orthogonally oriented antennas provided the largest part of the solution, but the availability of more sensitive receiver ICs played no small part. Frequency hopping and direct sequence spread spectrum is being used by competing manufacturers, and a couple have even implemented a combination of both; I'm not sure how the processing gain is calculated in the former case.

TM1000 DSMX Full Range Aircraft Telemetry Module by Spektrum - RF Cafe Cool ProductNow I'll return to the telemetry and smartphone app part of the story. A couple years ago R/C system manufacturers began offering receivers and stand-alone airborne transmitters that talk back to the earth-bound transmitter in the pilot's hands. Onboard sensors report battery voltage and current (complete with low battery warning alarms), engine/motor temperature, RPM, altitude, airspeed, motor power for electric-powered aircraft, signal quality, and a few other functions. Parameters display on the large LCD screens that are a part of the more expensive transmitters (some more than a 1kilobuck). The entire flight can be recorded for playback later.

STi Telemetry Interface by Spektrum - RF Cafe Cool ProductThe Spektrum™ STi™ Telemetry Interface for iPhone®, iPad® and iPod touch® is a stand-alone receiver that does not require a suitably equipped transmitter to operate - it simply plugs into your device. That allows a helper to monitor critical functions for you while you concentrate on flying the airplane. It is not unusual on sophisticated model aircraft to require an assistant to operate auxiliary functions like flaps, bomb release mechanisms, machine gun firing, brakes, etc., so having a helper for monitoring onboard conditions is not a new concept.

Do I have one, you might ask? No, not yet. Time just does not permit me to justify the cost at this time. As soon as some company from China buys RFCafe.com for a couple million dollar$, then I'll be getting one right away. It would be nice to get one to do a teardown report, though.

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.

All Featured Product Archive Pages:

| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 |



Posted August 5, 2011