Radio Frequency IO

MICREL wireless chips, 300 mhz AM only and you only need a ceramic resonator and a few outboard parts-they are cheap, use low power and run at 3 Vcc. They are made for data transmission up to 300 feet.

A simple RF Transmitter for digital data

Manchester encoding.

PIC Microcontoller RF I/O Methods

Cybiko Wireless PDA / Game : A complete RF data design / platform for pennies

Low power RF links e.g. LoRaWan

Bluetooth@ Pagers@ Cellular@ WirelessLANs@ GPS@

Books:

• 
  Radio Handbook (23rd Ed, Reprint) by William I. Orr
• 
  Rf Circuit Design by Christopher Bowick
• Secrets of Rf Circuit Design by Joseph J. Carr
• The Radio Amateur Antenna Handbook
• The Arrl Handbook for Radio Amateurs...

See also:

• http://lowpowerlab.com/shop/index.php?route=product/product&product_id=50 Moteino is a low cost wireless Arduino clone based on the Atmel ATMega328P microcontroller: Low cost Arduino clone fully compatible with the Arduino IDE, Open source, github.com/LowPowerLab Designed with low power battery operation in mind, 3.3V onboard regulator (MCP1702) provides up to 250mA, input up to 13.2V, The regular version includes an onboard RFM12B transceiver and wire antenna
• http://www.icrobotics.co.uk/wiki/index.php/Turning_the_Raspberry_Pi_Into_an_FM_Transmitter Using an internal clock divider to make the carrier and "Modulation is done by adjusting the frequency using the fractional divider between 100.025Mhz and 99.975Mhz, which makes the audio signal. The fractional divider doesn't have enough resolution to produce more than ~6 bit audio, but since the PI is very fast, we can do oversampling to provide about 9.5 bit audio by using 128 subsamples per real audio sample."
• http://www.rfdigital.com pre-certified 2.4GHz modules with support for several uC's.
• http://www.zen22142.zen.co.uk/Circuits/rf/sfsm.htm Ultra simple RF Field strength probe
• radiometrix.co.uk has 433 MHz transceivers
• RF Modulation Inc.
• http://www.redsword.com/tjacobs/geeb/fmcard.htm Hacking an ISA FM Radio card to tune 50Mhz to 160Mhz
• http://bigbang.vtc.vsc.edu/fmradio/
• http://sm0vpo.8m.com/index.htm Homebuilt circuits and PCBs for RX, TX, power, building blocks, etc...
• ../microchip/rftxcw.htm CW RF TX useing an 8 pin PIC, crystal oscillator generate variable width pulses
• www.abacom-tech.com Ming's RF xmitter/recievers distributed by Abacom Technologies
• • AM Tx and RX (<$12) upto 250ft at about 4kbits/s
  • FM Transceiver ($90) 500ft 40kbs
• http://www.convergentinc.com - AM Tx and Rx (<$10)
• http://www.lemosint.com - FM Tx and Rx (<$30) upto about 200m at low ?4kbs? - (<$40) upto 300m at about 40kbits/sec
• http://www.wirelessmountain.com/unilink.html
• http://www.linxtechnologies.com/f_modules.html
• 60Hz hum:
  • 60Hz hum is either radiated and picked up by antennas or possibly being brought in on the power cord and must be filtered out in thereceiver. See: http://www.wolfenet.com/~kiwa/rxtips.html
• Antennas
  • http://www.arrowweb.com/M1/otr/antenna.html
• http://www.markworld.com/hamtools.html a tiny PIC16C54 based CW beacon and other Ham stuff
• http://bipt106.bi.ehu.es/psk31.html
• http://www.linxtechnologies.com
• http://www.tapr.org

microwave PWB layout tips

general circuit design

David A Cary of Motorguide Pinpoint Says: " general circuit design "

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• [EE] RF impedance matching PCB layout / analysis?