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
PIC Microcontoller RF I/O Methods
Cybiko Wireless PDA / Game : A complete RF data design
/ platform for pennies
RF links +e.g. LoRaWan
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,
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+
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."+
2.4GHz modules with support for several uC's.
Ultra simple RF Field strength probe
radiometrix.co.uk has 433 MHz
RF Modulation Inc.
Hacking an ISA FM Radio card to tune 50Mhz to 160Mhz
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
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
a tiny PIC16C54 based CW beacon and other Ham stuff
microwave PWB layout tips +
general circuit design +
A Cary of Motorguide Pinpoint Says:
general circuit design " +
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