By Wander Lúcio Gomes. (PU4WLG)


DDS-VFO Works Great!

Super stable and fun!


I had an old cobra crystal base and DDS-VFO expanded it perfecily!

Great Kit guys!

Jack Rabbit


I got the DDS-VFO installed in my 2000 and WOW! Works great, no holes no switches and looks cool!

Great band width, power is same on top and bottom.


I have all my Radios converted to DDS-VFO

My Galaxy drift is gone!

James 222


Select your DDS optiions
Display size
Select your DDS optiions
pro mini
Some reviews about us. 

Make your radio new again!

DDS-VFO kits are out of this world and the best way to upgrade or expand your old radio so it has a

new life and look.

DDS-VFO  manuals

User PDF

This is a great project for those of you who want a full functioning VFO for your radio. It can be as simple or as full featured as you like. Lets say you have a favorite radio but the Pll is dead and it will cost a lot to repair it, no problem, with the DDS-VFO you can, and cheap! Another example is your Channel display is out and you don't want to pay the high price of getting a new one, no problem...just slide in the DDS-VFO and your done!

The new version has been fully customized to adapt to various radio models, including HF radios. This version allows a frequency adjustment for bandwidth mode with limits from 0Hz to 99MHz, it also allows removing the Channel mode and Radio Receiver mode, remaining exclusively for a VFO mode.

In general, this version has:

   Channel Mode, VFO Mode, display your call sign, band Scan, spectrum scan, selectable

channel scan, priority scan

   HF Receiver Mode  (mixer not included, but easy to build or purchase from us!)

   Polyphonic roger beeps

         A settings / Service Menu with 29 items

includes several adjustments that can be made by the user, such as:

lock / unlock clairifier, choose between roger beep tones or leave in a random mode, Turn on / off frequency in Channel mode, limit TX time, control brightness of screen, set high and low frequency range, 2nd output for Transverter to name a few.



Ver 6.74 programmable channel scan!


The free version 6.27 is available to be tested, meeting expectations, a key for the full version is sold for $27.00. The release key can only be used in the Arduino you have. Here is how that works...

When you or we put the software on an Arduino, we ask you for the codes that the software generates, they have to mach and this is why the key will never work in another arduino. Then we send you an email with the key. The key is entered from the dial and once you have compleated the entry, you will have a full version.

***Remember, this key will only work for that Arduino board, you will need another board and another key to make another one work.****

Specials until further notice:

A kit including 1) Arduino, 1)Si5351, 1).96 OLED Display and encoder, along with parts / wires to build the basic circuit. 75.00

Full documentation is available below.

Send in your radio and we do it all for $175.00

( All radios we modify meet FCC part 95 regs for frequency range 26.965 to 27.405 ).

All of the componants of each kit we send you, are tested 100% In house before we ship.


Email for more information and kits.


Sold, Built and  Installed by Troy Radio Service                  

DDS-VFO Videos!

Install PDF

Full kit for you to install.           Choose firmware below.


DDS-VFO is intended for receive only operation if being used in “Class D citizen band radios inside the U.S.A” Operation other than receive in Class D citizen band radios inside the U.S.A, may constitute violation of part 95 FCC rules and regulations.

Information contained on this website is for technical and educational purposes only.

Note, we recommend the 0.96" display size for mobile radios. Base radios 1.2"

If you want to "roll your own" Purchase the 6.xx DDS-VFO Firmware only.
It comes flashed on an Arduino Pro Mini with the latest firmware!
There are two display sizes that the firmware works with, use the dropdown menu to choose the size of display you will be using.

Purchase and send your radio to us for installation.

Outside the U.S.A

Click here:

Comes pre-flashed on Arduino pro mini

Want to listen to the HF bands?          500 Khz to 14 Mhz

Order this great DDS-VFO accessory! HF RX Converter board. (Must have DDS-VFO installed in the radio you wish to use it with).

Just click and add to your shopping cart!

Scan information

Click for HF Pinout

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