The USB controlled software defined transceiver is currently in the prototype stage. I have 2 sets of PC Boards on hand. Each of the boards is 1.5" X 3.5" . Five boards make up the design.
USB Controller: The USB controller is a Cypress Cy7C68013A (the FX2LP) USB 2.0 interface with build in 8051 compatable microprocessor. One prototype has been built and tested.
AD9958/59 DDS: The prototype uses an AD9959 quad DDS plus 200 MHz Low Pass Filters for each channel and a high speed copmarator on each channel. The 2-channel AD9958 could be substituded (same pin-out) and only populate the filters and comparators for the 2 channels. The AD9958/59 provide 2/4 independent channels. Each channel can have independently programmed frequency, phase and amplitude. Starting of each channel can be synced to a common pulse ensuring control of relative phases. With the AM modulation capability, it should be possible to produce SSB (or any other modulation type) at up to 200MHz. One board has been assembled and tested with the Analog Devices control program. The AD9959 on this board was able to be clocked at 750MHz OK. The board uses a 125MHz canned oscillator. Multiplies of 4, 5 , and 6 all worked correctly.
QSD: The Quad Sampling Detector is very similar to the Softrock 40 design(except for the LO). The AD9958/59 will drive the LO directly.
BPFs: The band pass filter board has 6 band pass filters for the HF spectrum. Two FST3251's are used to switch the filters. Ptototype boards have been produced but not assembled or checked out yet.
QSE-ADC-DAC: This board has the quad sampling exciter, an Analog to Digital Convertor, and a Digital to Analog convertor. Both the ADC and the DAC are stereo 24bit at 192KHz. The QSE is the same design in the 4 part QEX article on SDR for the Masses. Prototype boards have been produced but not populated yet.
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