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New AD9833 VFO Battery Monitor DDS Signal Generator DDS Auto Band Filter switching DDS Xtal Substitute-2017 Update DDS Xtal Substitute MK2-Retired DX160 Mods Frequency Dependant switch Grid Dip Meter (GDO) Add on FT101Z/ZD Internal DDS VFO Noise Canceller - aka X-Phase Noise Canceller - 3d box PCB Info PicKit3 Programming Adapter pcb PSK RF Prototyping PCB Si5351 Local Oscillator module Pt1 Si5351 Local Oscillator module Pt2 Simple DDS VFO-2017 Update Simple DDS VFO-2021 Update Simple DDS Sweeper Simple SDR
Band plans Encoder Headaches FT757 Battery Replacement Desk Lamp LED Conversion Old Radio's QSL Cards Tips & Tricks
G3OAG Filter/leveller for DDS modules F5ITU Simple DDS VFO Mods Philips PM5326 DDS Mod UR5WHK AD9833 VFO
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News, Updates and Other Minutiae

August 2025 UR5WHK has created another version of the AD9833 project with a 128 X 32 OLED display. You can find it under the Gallery menu - it is on the same page as the MAX7219 version.

July 2025 UR5WHK has created an updated version of the AD9833 project which now includes a MAX7219 based LED display. Code updated 10 July 2025. Code updated again 15 July 2025. You can find it under the Gallery menu.

March 2025 In something of a "Seniors Moment", I forgot to update the homebrew menu and this section relating to a project I did late 2024. That project is an update of one from the RSGB Radcom magazine of Sept 1999 - 'Turn Your Dip Meter into a Signal Generator'. Presented here as 'Grid Dip Meter (GDO) Add on' under the Homebrew menu.

November 2024 Phillipe F6ETI has done some serious testing on the Noise Canceller and shown it works up to 72MHz and is usable with some loss at 145MHz. Links to his website with photo's, video's and description of the testing on the 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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