All posts in the 'RF projects' Category
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]
Posted on 04 Aug 2008
Here is 40 Meter Popcorn Superhet Receiver.There is no AGC or RF gain control, however this receiver has good large signal handling capability. This receiver uses just 6 bipolar transistors and an op amp for reasonable volume into headphones.[more]
Posted on 01 Aug 2008
This covers the band in increments of 0.25Hz and can operate “between the lines” of the Loran interference which is present throughout most of Europe. The design is based on the MiniDDS project by Johan Bodin SM6LKM.This driver uses the Analog Devices AD9832 DDS chip which is controlled by a PIC16F84.[more]
Posted on 28 Jul 2008
This tiny transmitter has several “defects”: smaller radius of the service area, lower quality of the sounds and the relatively unstable frequency. These can be considered as a compromise to easily have your own transmitter for the time being or as a more positive choice. These “defects” are only from the perspective of conventional transmission such as “clear stereo sound to receive anywhere”. Artist could change these to another directions. Whether or not, you can experience a convivial wireless imagination by this transmitter.[more]
