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Showing posts from January 3, 2010

DDS Version 4 Build By G6AJW Dave Lucas G6AJW

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Direct Digital Synthesizer VFO For Bitx
By C.V.Niras/VU3CNS
cvniras@hamradio.in 

The Project is publised in hamradioindia website



The DDS Version 4 is an excellent project for using with any tcvr. Many Ham's are now purchasing the PCB and building the DDS 4 Project.


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PIC16F628A and AD9850 or AD9851. PIC16F628A is an 18-Pin microcontroller
with 2K byte program memory, it is a FLASH-based and a member of the versatile PIC16F62XA family of low-cost, high-performance, CMOS, fully- static, 8-bit microcontrollers. PIC16F62XA devices have special features to reduce external components, thus reducing system cost, enhancing system reliability and reducing power consumption.

Features
1. Range 0 to 70 MHz by 1 Hz step.
2. Freq setting in 1, 10, 100Hz, 1, 10, 100KHz, 1, 10 MHz by using a low
cost mechanical encoder with a variable tuning rate. 3. 2 rows X 16 character LCD display.
4. A 4 x 3 Keypad used for easy freq entry.
5. IF, CW, SSB offsets settings when used with Transceiver/ Receiver.…