Soft66AD Series

Now Soft66LC4 is newest version.


Now Soft66LC4 is released. Soft66LC4 is added lower BPF with Soft66ADI. 0.5MHz to 70MHz.
Soft66RTL is released. 


These specifications change without a notice.
*newer Soft66ADD can receive upto about 70MHz.

sample wav file1 -> 2009.05.31 center frequency 21.2MHz 192kHz sampling

sample wav file2 -> 2009.06.08 center frequency 7.1MHz 96kHz sampling

Soft66AD is new designed Software Radio front end. It is easy to connect to your PC and receive HF band. For amature radio user and BCL, Soft66AD is very usefull receiver.

G8JCFSDR suport Soft66AD now!  Please visit and try greate software.

New! Coool control soft by EA2BQH. Thank you !

Soft66ADD control for Linux. greate works!

*Please visite each site for newest informations. If you have any question, please ask each authors.
*newest Soft66LC4 is working with original control soft under 2.5MHz.



  1. Do not install from windows update. install FTDI driver from here.

  2. install newest  NET Framework.
  3. install control soft from for LC2 and LC3. for LC4.
    source code is including in archive.

  4. Change PC locale to English. Soft66 control does not work another locales.
  5. Plug MINI USB cable with your PC.

  6. Plug stereo jack into sound card LINE IN.  

  7. connect to antenna with SMA jack.

  8. Launch control soft first. select M(Soft66AD) or H(Soft66ADH*) button. Input frequency* which you want to receive and click Tune button. If you have new Soft66LC2, LED will be blinking  when the control soft is raunched.

  9. Raunch  SDRadio or Rocky. Select soundcard and select LINE IN on recording mixer.You need to click start icon on Rocky and Winrad. also need Rx button on SDRadio. Please read instructions each software.

*If you fails install, please check you have permission of administrator.

*Please note for Europian users, This control soft use "." as decimal point.

"," does not work on this soft. You need to change locale to English.

*Look your PCB, Soft66ADI is written by FT245RL USB interface.

Soft66ADD use same H mode on DDS34 control.

Please note Soft66ADD users, Soft66ADD does not have BPF unit for over 30MHz.
also turn trimmer for suitable position. If trimmer is placed wrong position, you can not get sensitivity or get much noise.

Please look instruction for Soft66ADH(kit).

Soft66ADD,Soft66LC must select H.

BPF checked is NO BPF mode. No checked BPF is auto BPF mode.

For Soft66LC2 users,

LED indicater  -> plug USB cable, green led is lighting. running DDS34 control , blinking red led every 1 sec. When you change frequency, red led is blinking. This is normal status. Your Soft66LC2 is working.

If your Soft66LC4 has solder jumper on solder side of PCB.
try re-solder the other side V+.
multiple rate become 6 times. you can recieve more higher frequency.
use this alpha control.

DO NOT USE PRE AMP. Newer Soft66LC2 has ESD diode at top of antenna input.

Known problem(This problem is almost resolved at Soft66ADI.)

Please note for DELL PC user. If your PC does not recongnize FTDI driver of Soft66AD,
try pulling the USB plug and placing it. do it 2 to 4 times.
If USB bus power is weak, it is not enough to charge capacitor of ripple filter.
There are some noise of USB interface. 4MHz,8Mhz,12MHz,etc

There is cross modulation same as direct conversion receivers.
If  tere is cross modulation, try to adjust RF gain by trimmer.


How to question by e-mail. For answer your question, I need details of your setting. I can not help you with only "not work" .

Please write about details of your condition.