All posts in the 'RF projects' Category
Posted on 25 Aug 2008
This is a High voltage regulated power supply for RF amplifiers project.It is an enhancement of the article by VE6AXW in July/Aug 1999 QEX by adding EMI filtering, included a programmable power on timer, and generated a printed circuit board layout.[more]
Posted on 22 Aug 2008
RFID cards are commonly used for access control and bus/train tickets. They are convenient because no direct contact is required to transfer information to and from the card. The card itself is powered by the RFID reader, so there is no battery to change.The most common design for RFID reader is to use a series resonate circuit. This consists of a single inductor and a capacitor excited by a low impedance voltage source.[more]
Posted on 20 Aug 2008
This is a guide to DIY an antenna for your access point.The reflector is designed to be fed by a dipole. That is why it is not circular. A dipole is long and cylindrical, the focal point on a circular dish is circular. The focal point on this design is a cylinder. The reflector is designed to be “square”.[more]
Posted on 20 Aug 2008
This Project began to explore the use of the DVSI AMBE 2020 voice compression chip and also the ADF7021 single chip VHF RF Transceiver from Analog Devices. It appeared that this radio could be made to talk D-Star and that turned into yet another adventure trying to fill in the many holes in the published “Open” D-Star Specification. [more]
Posted on 08 Aug 2008
Here is a stereo FM Transmitter based on BH1415F wireless audio link IC.Phase Locked Loop controller use Microchip PIC16F628 and the the PLL frequency programming can be displayed with 8×2 and 16×2 LCD display.The frequency range can adjustable from 88-108 MHz.[more]
