RF Wireless

RF Wireless Communication, Radio.

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Resources for Radio, Radar, RF, Microwave, & Wireless Engineering. Collection of links to various application notes for different RF Vendors. Links to RF equations, technical data sheets, math notes and much more.

RF Cafe – Microwave & Wireless Engineering

Some important areas

  • RF Engineering Calculators
  • Electrical / Electronics Conversions, Formulas & References
  • Design Data Resources

E-flite Mini Pulse XT - Brushless ESC Waveform - RFCafe

E-flite Mini Pulse XT – Brushless ESC Waveform

This waveform shows the square waves that drives one of the three phases at a relatively low throttle setting (coming from the brushless speed controller). The peak amplitude is constant for all speeds.

“Much more than just a self-serving video of my new R/C airplane flight agility, this model represents a plethora of modern electronics. Although the radio control system in this plane is a standard narrow band FM variety on 72.170 MHz (as opposed to my 2.4 GHz, spread spectrum system), the motor is a state-of-the-art 3-phase brushless model (E-flite 450)with a sensorless electronic speed control (E-flite EFLA331, 20 A).”

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Since 1978, Wenzel Associates has defined the state-of-the-art in ultra-low phase noise while providing system manufactures with the highest quality, cost effective frequency components and instruments.

Wenzel Associates introduced the Blue Tops system building blocks to offer oscillator users well-characterized, low noise components, which improved the time to market for new frequency based systems.

Wenzel Associates Technical Library

  • Time and Frequency Circuits and Articles including frequency synthesis and conversion.
  • Crystal Oscillator Tutorial Articles cover oscillator types, terminology, and selection.
  • Spreadsheets/ Programs to calculate pll response, phase noise under vibration, and others

Phase Noise Measurement

Wenzel Associates Technical Library

“The measurement technique compares the phase of an oscillator under test to a reference oscillator with similar or superior noise performance.”

Wenzel Associates, Inc
2215 Kramer Lane, Austin, TX 78758, USA

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Here is an example how i feel a DTH portal can interleave with interactive optical/wireless networks on land.

Let us assume Simtel has a DTH Channel. They broadcast MS updates from 10.00 AM to 10.30 AM. Linux updates at 11.00AM and Mac at 9.00 AM. All updates, some repetitive in gzip format and a advance xml feed indicating and enabling parsing of content on a digital device.

DTH for Software Downloads and Updates

From 1.00 PM to 5.00 PM is subscriber time. “Your favorite software is ‘played’ at these times”. A user can use his phone or tablet to request a media. paid or free. All software will be broadcast at the time slot. With a xml feed/sitemap.

The user transfers the software from dth box to his computer using usb/lan. If he has been mailed dual layer decrypt keys he will be able to unzip the paid software. Else he can look thru the formatted/presented xml for any free software/media he would like to use.

DTH software providers can monetize using software developers to publicize their demo versions. Other firms from computers to toothbrush providers can give a “Media Promotion Pack” with wallpapers/freeware/video/audio/presentations and discounted/free offers.

Auxiliary Software Media DTH Download Box – Reduce Net Congestion

# Either you connect the USB of this Download-Box to Router to make a media server for your Netbooks & Tablets or plug it to your Desktop PC.

# This has a Tiny LCD Touch Screen, Key in the URL & Press Get, Wait. Media ready beep will come in a few secs. Satellite Delays don’t matter.

# Invent something like Satellite Software/Media Download DTH Service – Small dish on Roof, A Stand alone Box with One Tera Byte HDD and USB.

2008 – delabs

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You have a big office of 3 Floors or a Home which is not Wi-Fi Friendly and it does not have the provision for LAN or any other wiring. Even a distant room/garage or basement beyond the Wi-Fi range.

Wireless Gigabit Alliance – WiGig 60 GHz

If we could build a Wired interface for Wi-Fi and WiGig then such rooms can be brought within range. A wired interface without wires, then you think of optics, not even optic fiber …. that will build up the cost for home networks.

Wave Guide may be an answer, a wire that pretends to be a waveguide. Let us take a thin flexible plastic tube, 2-3 mm in dia, 1mm wall thickness of tube. The outer wall of the 3mm tube is coated with a suitable copper alloy. Above that a thick insulation to protect from mechanical damage. This may act as a waveguide if properly designed, probably the way or pattern in which the metal is coated.

Wired Wi-Fi or WiGig for enhancing Range

 

Fixed WiMAX SoC and RF Module – Fujitsu

If this works in theory, then Pump RF on one end with a little more juice, just like in Optic fibers. The other end may get enough signal strength for good speed connectivity. It will at least be still wi-fi on waveguide and easier to implement than RJ45, these LAN cables, connectors and switches include many components and modules, that make it very fussy and unreliable.

Wi-Fi seems to be very friendly and safety has also improved now. So a wired, one wire or waveguide to extend Wi-Fi can phase out the RJ45. I like RJ45 similar to the sentiments i have for the Printer Port and RS232. Then USB has just taken over. Change is inevitable, Find a way out of RJ45 for good.

delabs 2010