Frequency Range	9.999 MHz to 123.456 MHz
Resolution	1 kHz
Output Power	-25 ... +15 dBm, using GALI-5+
DC supply voltage	15 V ... 30 V, less than 199 mA

Inspired by the success of the Kumod we also wanted to have a single RF source for our "ususal suspects" of frequencies, which are 15 MHz, 80 ... 123 MHz. So this is more a soldering and programming exercise - but it has the precision of the used frequency standard.

The brain here is the Arduino Nano Every, which handles the user input as well as the programming of the dds chip and the updating of the oled.

Besides that, it is waiting for SCPI commands, sent via usb.

The output of the AD9953 is lowpass filtered by an SCLF-135 from Mini-Circuits. A Gali-5+ delivers some power. The amplitude is software controlleable.




The workhorse, the AD9953. Drawing courtesy of Analog Devices


And yes, it can do so much more. Just some small changes in software :-)

Please accept our apologies, that our arduino sketch does not solve your homework. Consider this as a starting point only ...




A look inside. And this time, the intersting things are not hidden under the cable :-)

It is very likely, that other homebrewers have different amplifiers in their treasure-box. In order to measure the ASFRegister - Amplitude characteristics, we used the function CALA:xxxxx. You can send values from 0x0000 to 0x3FFF (decimal 0 to 16383) to the device while measuring the output power with a trustworthy Powermeter. We did this at 50.0 MHz. The values can then be hacked into your favourite spreadsheet.




measured values and trend line, kindly provided by the spreadsheet


All we have to do is to calculate the inverse function of the trend line. This is then put into the function UpdateASF() (line 181) and we are almost finished. The task remaining is the adaption of AMPLI_MIN and AMPLI_MAX, the floor and ceiling of our amplitude business. This is done in line 37+38.

Once upon a time, there was analog television. And the picture carrier was at 38.9 MHz ...

Remote Control with e.g. HTerm 0.8.5 from Tobias Hammer

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