BeaconTNG building blocks
Written by Administrator
Saturday, 27 March 2010 12:51
Slowly all the building blocks for the BeaconTNG project are getting together. The code is running now on the new CPU and the TCP/IP
stack is working. With support of YO2LIO who wrote some excellent libraries for the Mikroe compilers I implemented a Telnet server.
Function is there, now I have to implement features for the CLI. All building blocks are now moved to 3.3V supply. For that I had to reduce
the master clock from 30MHz to 20MHz, as the AD9851 only supports 20.83MHz at 3.3V.
· The ICSP interface of the CPU will move to a pin head connector inside the box as it will not be needed by the user. Software updates
can be done by a TFTP bootloader via Ethernet.
· The GPS receiver will have two external connectors for the 1pps signal and an GPS oscillator output. This way the unit can be used in
the shack as a frequency reference when it is not in use as a beacon.
· There will be a slot for a future option module. This could be a VLF amplifier, a frequency multiplier or something I can't think of yet.
The DDS source signal, SPI Bus and some of the spare I/Os will be available to this slot.
· An antenna switch controller will be integrated with 8 opto-isolated outputs. These can be used to switch antennas or external amplifiers.
Soon I will have the PCB layout ready and order the first sample. Comments and ideas are very welcome!
Find out more about the BeaconTNG procect here!
Stay tuned on the project.
Last Updated on Friday, 02 April 2010 15:18