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DDS direct synthesizer 
<  Efficient type  One output specification    WH-002SHG-1  >
The control is a masterpiece to enable a convenient control with the PIC microcomputer.
Especially, it sticks to the frequency accuracy.
I think that the technology more than a middle level is necessary of the kit difficulty.
Popular  It is putting it on the market.
 > The frequency is changeable in the encoder.
> A large-scale LED indicator that sees easily
    is adopted. (eight digits)
> VFO(A) VFO(B) VFO(C) For three bands
   (*1) Each band : the frequency that is basic.
   It is possible to set it up to three.
   Memory CH  4CH~3 = meter 12CH
> With RIT function As a switch It is seven of
  (stsp.inc) (RD) (WR) (A) (B) (C) (RIT ON).
Output frequency changeable range
1Hz - 50MHz
Efficient type WH-002SHG-1
(one output specification)
[Final product ] 1-unit $210 (Us dollar)
  It has assembled it.

power supply input. It is DC8V-12V

©  It observes it with
     the Spectrum analyzer.
  F = 5MHz SPAN=10KHz RBW 30Hz
  Wonderful C/N characteristic
  80db down of basic wave adjacent noise

  output voltage 1Vpep
Main Circuit chart  PDF
 Display part Circuit chart PDF
  y Content z  Standard accessory
1. The main substrate. DDS IC has been installed.
    Standard transmitter. CPU . Logic IC
2. 7Seg LED ‚W digit indicator
3. Encoder Mechanism ( Resolution 25(P/R) )
4. Indicator connection cable
5. Connector complete set attachment for external switch connection
6. All parts installed in the substrate are attached.
   (The optional feature is excluded. )
7. Oneself must prepare the switch and LED, etc.installed outside the substrate. (It is not attached. )
8. The power supply DC8V`12V Please prepare the thing of 400mA or more. (It is not attached. )
  y Toc Signs & Function explanation. Firmware Ver1.01 z
1. A highly accurate DDS chip of an analog device is adopted. ( AD9851BRS )
   This device has six times the putting calculation machine internally and if 30MHz is input,
   The DDS device works with operation clock 180MHz.
   Outputting this high clock type to 50MHz by the adoption became possible.
   A high-speed access is achieved by setting the frequency in parallel.
   It is changeable occurrence in smoothness as for the frequency.
2. A standard transmitter adopts an efficient temperature amends type (TCXO type) Crystal module.
   Frequency accuracy +-2.5ppm / -10`+60Ž ( Aging characteristic +-1ppm/year )
   Standard frequency 30.0MHz is assumed, and Zhari of the DDS chip oscillates, and is assumed to be a clock.
   An external input terminal is prepared for how for being using a more highly accurate standard transmitter.
3. It corresponds to the mechanism type and optics by an original
   encoder positive reversal judgment circuit. both
4. The frequency is changeable in the encoder. Minimum operation (Step 1Hz )
5. The frequency step is changeable. ( 1.10.100.1k.10k 100k HZ)
6. There is an operation mode.
   VFO that prepares four mode( A. B. C )DIRECT mode
   It is one-touch and a switch of three VFO(A. B. C) modes.
   VFO (A).VFO (B).VFO(C) It is possible to initialize separately, and it becomes three band correspondence.
   In a direct mode, the display is a corresponding mode to the output frequency.
7. About the VFO mode.
   The VFO mode sets the display and the frequency of the standard by initialization
   and is changeable occurrence mode.
   A display and an actual output frequency can be offset by initialization and it set it.
   The standard and reverse can be selected by initialization and it set it.
   The display frequency improves with reverse, and the output frequency is downed oppositely.
   This function is effective to the model of a reverse-heterodyne of the sending and receiving machine.
   This VFO mode is VFO of the wireless machine and a function that might not use it.
8. A large-scale LED indicator that sees easily is adopted. (eight digits)
   Making to low current consumption by dynamic lighting method
   It is settled for eight digits with current consumption of 1/8 compared with the static lighting method.
   The current consumption of the indicator is about 100mA.
   It is an independent memory in the VFO(A&B&C) mode.(4CH ) (total 12CH)
10. With RIT function that completely becomes it
   (The switch signal from the sending and receiving machine is necessary. )
11. The rectangular wave output function is provided.
   y Spec z
1. Power supplDC8V`12V  300mA in the maximum current
2. Changeable range of frequency 1HZ ` 50MHZ
3. Frequency accuracy Temperature characteristic +-2.5ppm / -10`+60Ž
   (Aging characteristic +- 1ppm/year)
4. OUT A1 Output impedance 110ƒΆ output voltage 1Vpep (1Hz ` 10MHz)
   OUT A1 Passing ..peel.. Ro filter street output (Cutoff frequency 10MHz)
5. OUT A2 Output impedance 100ƒΆ output voltage 1Vpep (1Hz ` 50MHz)
6. Externals size The main substrate 120~80mm
   Display substrate 138~25mm
7. External input of standard transmitter 5V TTL
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