HC908 VFO

A DDS VFO using the DDS-30 or DDS60 daughtercard and
controlled by the powerful HC908 daughtercard microcontroller

            


Description  |  Block Diagram  |  Features  |  Instructional Videos  |  Schematic  |  Parts List  |  Modules  |  Documentation  |  Software  |  Ordering  |

       
Views of the prototype HC908 VFO module mounted in an optional Ten-Tec enclosure.  (Click on a photo to see a larger view.)

Product Status
The HC908 VFO project has taken a dramatic step forward in being a full-blown and capable VFO product, suitable for use as test equipment, an add-on digital dial to boat anchors and QRP transceivers alike.  The software has been substantially expanded and improved to make it a unique and low cost offering in the ham markets, yet still possessing features and performance to rival any other.  This is due to the flexible and extensible nature of the core design's use of the HC908 controller card and the popular DDS-60 signal generator card. 

Update: August 2016
I have finally begun finishing off this project by completing the motherboard and enclosure, and will be kitting up this project during October of this year (2016).  Feel free to ask me about it or look back here from time to time to see the progress.  I am continuing to greatly enjoy using the prototypes that I have right here on my own bench, and I'm sure you will too once the kit is available.  (I will also be supplying the HC908 VFO as an "assembled and tested" item.)  

 

DESCRIPTION
The HC908 VFO is a full-featured VFO capable of high-quality sinusoid signal generation up to 60 MHz, with features making it uniquely capable within Amateur Radio markets: a high-contrast back-lighted display, a single encoder control, multiple memories, flexible IF offset and multiplier settings to accommodate a wide number of radio design architectures, modular controller (HC908 Daughtercard) and signal generator (DDS-60 Daughtercard), 40 bits of available digital and analog I/O for custom use, an advanced menu system for easy access to all features, and a built-in serial port providing field upgradeability by allowing the owner to download and update the VFO with improved software versions when available. The HC908 VFO is available as a single printed circuit board that may be used with an optionally-purchased standard enclosure or in a custom project chassis. The software source code is freely available for developers to modify and extend VFO capabilities using a free and powerful development suite from P&E Micro.

BLOCK DIAGRAM

FEATURES

 

INSTRUCTIONAL VIDEOS

We created a dozen 5-minute video segments that collectively overviews most of the VFO's features, as well as the hardware design and the software development environment (described more completely in the SDK that comes with the product.)

Just click on the images below to be taken to an online "Flip Share" site where you can view the videos individually, as desired. Use the title of each video segment as a guide to what you'd like to view.

[Videos are being updated with the latest capabilities ... please check back later.]

 

SCHEMATIC

 

PARTS LIST

 

MODULES

HC908 Daughtercard

DDS-60 Daughtercard

 

SOFTWARE

The HC908 VFO software can be downloaded to your PC and easily placed into the flash memory on the HC908 daughtercard without using any expensive hardware.  Just follow the easy steps to load the S19 binary file into your system and you'll be off and running in no time.  The source code is also provided for those wishing to experiment in software.

Source Code (version 3c)

S19 Binary (version 3c)

 

DOCUMENTATION

Operator's Manual

 

ORDERING

I have finally begun finishing off this project by completing the motherboard and enclosure, and will be kitting up this project during October of this year (2016).  Feel free to ask me about it or look back here from time to time to see the progress.  I am continuing to greatly enjoy using the prototypes that I have right here on my own bench, and I'm sure you will too once the kit is available.  (I will also be supplying the HC908 VFO as an "assembled and tested" item.)  

Please let me know of you are interested in staying informed of progress and pricing as it becomes established, and I'll put you on a private mail list for this information.  Contact me at for this.

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Page last updated:  August, 2016