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September 2023 Long time between drinks, but not much happening on the tech front at the moment. Added another couple of rants to the rant page.

January 2023 Updated the AD9833 VFO code to use a 12F1840.

December 2022 Added rant about todays useless (internet) search engines.

November 2022 NEW Project An AD9833 Based Simple VFO. FT101ZD VFO project updated.

October 2022 A replacement internal DDS VFO for FT101Z/ZD rigs. Because the worlds postage system has gone totally bonkers and it is not possible to send a small pcb anywhere except at extreme cost, I am slowly making available the option to purchase pcb's from Pcbway. First up is the Simple DDS VFO 2017 project pcb. Others will be added over time. Noise Canceller kits available again- see Noise Canceller page.

Privacy Policy uploaded. GPDR and all that stuff In accordance with various bits of legislation around the world, either currently in force, about to come into force or proposed, you will now find that annoying "We use cookies" notice at the top of this website. The full Privacy Policy is available at the Privacy Policy link in the footer at the bottom of the page. (If you don't know what GPDR is, Google it. Real scary shit for ANYBODY with a web presence.)

F1ITU Simple DDS VFO Mods

Daniel F5ITU:- "I just finished the adaptation of your software to "Simple DDS VFO" for my personal use. It works well and I will soon install it on my "DC receiver". So, now I have a VFO (10Hz step) and which performs a 600 Hz shift when it receives a transmission command on GPIO-3. In addition, I added to the printed circuit, an amp to increase the output level so I can get the necessary 7dBm the SLB-1 RX."

F1ITU DDS amp schematic F1ITU DDS pcb top F1ITU DDS pcb bottom

Daniel kindly sent these images of the changes to the code, along with his actual ASM file as well as his Sprint layout file for his pcb. You can find them at the end of the page. Because the following images may be a little hard to read, I have put them in a zip file you can download, also at the bottom of the page.

ASM code mods ASM code mods ASM code mods ASM code mods ASM code mods ASM code mods ASM code mods ASM code mods

Daniels code file. PIC12F629-08.asm And his PCB layout. See the PCB Info page for information on using this file. DDS_Dan-1.lay6 The coding images from above. F5ITU.zip

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