Strip down version of Controller short Kit for the AD9850/1 DDS Signal Generator Module VFO.  VERSION 3K0x

NOTE: There will be no output from the cheap AD9850/1 DDS Signal Generator Module sold on E-bay without a Controller like this. or an interface circuit and a computer and software. This controller circuit and code will provide the functions (SEE THE CODE  SPECIFICATIONS BELOW), to control an  8 digit 7 segment LED Display module and the AD9850/1 DDS Signal Generator Module. 

The Kit consist of

1 off  Pre-programmed  and tested Pic Chip.

plus Instruction Manual and Circuit diagram. 

(PLEASE SPECIFY THE MODULE AD9850 OR AD9851 IF YOU BID)

NOTE:

The AD9850/1 DDS Signal Generator Module, The  8 DIGIT 7SEG LED MODULE, or the Rotary shaft Encoder are  ARE NOT INCLUDED, They can be obtained off E-BAY, 

The Prototype Item shown in the picture is not for sale they are build example only.

PROJECT DESCRIPTION 

PIC16F628A-VFO DRIVER- FOR AD9850/1 DDS + 8 DIGIT 7 SEGMENT LED DISPLAY MODULE.

ANOTHER OFFERING BY KAMCODE FOR THE AD9850 or AD9851

THIS VERSION IS A VERY SIMPLE DESIGN, THE LAYOUT AND BUILT EXAMPLE, IS SHOWN IN THE PICTURES.

THE TUNING FREQUENCY RANGE IS SELECTABLE FROM 5 UK BANDS AS FOLLOWS:

160M: 1.81 MHZ TO 2.0 MHZ,  

  80M: 3.5 MHZ TO 3.8 MHZ 

  40M: 7.0 MHZ TO 7.25 MHZ 

  20M: 14 MHZ TO 14.350 MHZ

 T520:  VFO (5.0 TO 5.5 MHz for TS 520/820 VFO)

OTHER BAND PLANS CAN BE PROGRAMMED ON REQUEST.

CODE FUNCTIONS : (SEE BLOCK DIAGRAM)

THE CODE DRIVES AN 8 DIGIT 7 SEGMENT LED DISPLAY MODULE TO DISPLAY THE DDS MODULE SET FREQUENCY AND TUNING STEP FREQUENCY RATE. 

SWITCH INPUT (SW1) IS PROVIDED TO SELECT VFO A or B.

SWITCH INPUT (PB1) IS PROVIDED TO COPY VFO A TO VFO B

PUSH SWITCH (PB1) ALSO SELECTS THE FREQUENCY STEP:

10KHZ, 1KHZ, 100HZ, 10HZ, AND 1HZ

NOTE: THE DEFAULT TUNING STEP AT POWER UP IS 100 HZ,

AND CAN BE SET TO ANY OF THE ABOVE STEP.

SHAFT ROTARY ENCODER INPUTS (A and B) PROVIDED, USED TO TUNE THE FREQUENCY.

SWITCH INPUT (SW2) PROVIDED FOR  SPLIT OR TUNE BOTH VFO A AND B.

SWITCH INPUT (PB2) PROVIDED FOR MENU SELECTION USED TO SELECT CODE FUNCTION MODE.

SWITCH INPUT (SW3) PROVIDED FOR A TX KEYING.

THE TXKEY ‘ON’ WILL WRITE ‘VFO A’ FREQUENCY TO THE DDS MODULE REGARDLESS OF THE VFO SELECTED BY SW1.

VFO B IS INCLUDED TO PROVIDES RIT FUNCTION OR LO FUNCTION.

THE CODE IS DESIGNED FOR EASE OF USE AND IT IS EASY TO BUILD (SEE THE ATTACHED PICTURES), AND FOR RETRO FIT INTO RIGS LIKE THE FT101, TS520, AND SIMPLE DIRECT CONVERSION RECEIVERS, ECT....OR IT CAN BE JUST A SIMPLE SIGNAL GENERATOR/ REFERENCE. (THIS OPTION AVAILABLE ON REQUEST)

IF YOU PREFER TO USE A FREQUENCY COUNTER AND NOT INCORPORATE THE 7 SEGMENT LED DISPLAY THEN  THE CODE WILL ALSO WORK WITHOUT IT.

;

CODE SPECIFICATION