| UHFSDR | 995x | BPF | Si570 | 12-24V Convertor | 9912 | HSUSB | RLC_Meter |
The UHFSDR is a Software Defined Transceiver covering the 1.75 MHz to 700 MHz frequency range. A Si570 is used for frequency control. Two LVPECL 4 GHz max.flip flops produce I and Q LO signals at 1/2 the Si570 frequency. A pair of 1-1000MHz Double Balanced Mixers are used to convert signals to and from base band. A receiver pre-amp (2dB noise figure) and a transmit pre-amp(50mW max output) are provided as well as antennal switching plus provision for separate receive and transmit connections. For additional information, download the Assembly Manual. The BOM, schematic, and board layout are Here. A HiRes(3.7MByte>) picture of the completed board is Here KITS Art, KY1K, has a group buy that will include the printed circuit board, all parts except the Si570, and an enclosure. Contact Art Here. If you want part or all of your kit assembled by a professional electronics technician, contact Chris Waldrup Here. PCB(not needed if you get Art's Kit)
995x
The AD995x board contains a USB controller, a DDS(AD9951, AD9952, AD9953, or AD9954), a quadrature generator, and a Quad Sampling Detector(QSD). By populating appropriate parts of the board the board may be used for the following: VLF to VHF signal generator with programmable output power. Receiver covering at least VLF to 54MHz or above with connection to a suitable PC and soundcard. The addition of the BPF Board(controllable from the PIC controller) provides a complete receiver. Receiver and transceiver VFO with quadrature generation and receiver control. Spectrum Analyzer with tracking generator VNA(requires slight modification of the QSD circuit to provide DC coupling). For a full description of the operation of the board click on left. For a discussion of this board and associated software being developed join the DDS_Controller Group . Discussion group for a group buy of parts for the 995x board is here . Parts list for 995x-R1 hereParts list for 995x-R3 here . I have included values for 3 different LPF designs depending on the clock frequency used. Uncheck the values for L1,L2 and L3 as well as C26-C32 for the LPF freq. you are not using. To have boards partially or completely assembled, contact Chris Waldrup Here
Band Pass Filter
The BPF board contains 6 Band Pass Filters. Each can be up to 7 element Cheb. or elliptic in complexity. Coils can be any size from 0603 to 1810. The schematic shows my design for six 7 element filters designed for a general coverage receiver from 1.8 to 30 MHz. The filters are selected by 3 CMOS control lines. In addition, the board has transformer input and the control and RF grounds are joined at a single point. Click on BPF Board on left for board design documentation and engineering measurement made on the board.
Si570 Board
The first kits started shipping on Nov 20. The 2nd 200 boards are on order and expected Monday, Nov. 26. Tom, KM5H of the Softrock40 Yahoo group is doing a large group buy of the Si570. My parts kit does NOT include the Si570. The group buy for the Si570 Chips is here The parts kits contain the following: 2 - 10uF; 3 - .1uF; 3 - .01uF; 1 - 200K; 2 - 49.9; 4 - 1K; 1 - GTL2002; 1 - LP2992AIM-3.3V
This board is designed to supply 24V to a FET amplifier. This is a low cost design for a 12VDC input and 24VDC output at 4 amps(or more) convertor. Several prototype boards have been produced and 1 board has been assembled and tested. Runs very cool with 4.3 amps output. . The production board has provision for larger heatsinks and a larger coil for higher power and an additional resister on the NE555 to allow other voltages to be generated. The converter is available either as a bare board or as a full kit of parts plus the board. Board Only
Board Plus Parts
Production Boards are in stock for immediate shipment. A DDS oscillator board using an AD9912 and controlled by a PIC18F2550 USB controller will provide a single RF output from near DC to 400 MHz.
Production boards and kits are now available. This board was part of the Software Defined Transceiver. A Cypress CY7C68013A provides a high speed (480Mbps) USB 2.0 interface and an 8051compatable microprocessor. The design has been ported over KICAD. This would be a good board to use with 192 KHz A/D and D/A converters. High speed USB 2.0 is specified as 40 times faster than "full speed" USB 2.0 that is in the PIC USB devices. These boards are also compatable with the N2PK VNA. Bare PCB
Basic Parts(except CY7C68013A and headers and PCB)
Headers + Matching Plugs
CY7C68013A
I have layed out a PCB for the RLC meter that was in the Oct. 2005 QST and the Sept/Oct. 2005 QEX. The small board gets 5V from a USB port and connects to your soundcard(stereo line in and line out) to measure resistance, capacitance and inductance. The parts are all thru hole - no surface mount. Bare Board
PCB + Parts
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