Comments on: AD9850 DDS VFO

By: Paul - W2NMI

Paul - W2NMI — Sun, 18 Feb 2024 16:16:35 +0000

HI Rich
The AD7C DDS VFO lives on. I am using your code as a platform for a DDS VFO for the Heath HW32 20 meter SSB transceiver. I am working up the code for others as I do not have this particular transceiver myself. I modified the code to use a display shield so remapped the pinout. I kept the pinout the same for the encoder since that uses the pin 2 & 3 interrupt lines. Changed the pinout to the AD9850 and no issues. Set up the dial speed values using the UP button and retained the 10 Hz, 100 Hz, 1 Khz and 10 Khz values using that button for selection. Made the Down button a hot key to jump back to 10 Hz rate for normal tuning. Should be releasing this to the group shortly and then work up a version for the SB/HW 5 band transceivers, which the group seems anxious for. The DDS VFO boots up with a screen “AD7C V2.0+”, then with any button push displays “HW32 V.1″ for this initial code version. So, thanks again for getting is all a good code base for doing all these many DDS VFO projects.

Best 73′s

Paul – W2NMI

By: admin

admin — Tue, 14 Nov 2023 14:58:45 +0000

You’ll have to write two small IF statements in the calculation section for the intermediate. IF < = 10MHZ THEN SUBTRACT fintermediate. IF > 10MHZ THEN + fintermediate. The exact code shouldn’t be hard to figure out.

By: Vitaliy

Vitaliy — Tue, 14 Nov 2023 12:18:28 +0000

Hello Richard! Thank you for the great project, it works well, but not quite what I need. I would like to get the following frequency value: up to a frequency of 10MHz (30m range) the value should be Freceived=Fheterodyne-Fintermediate frequency, above 10MHz the value should be Freceived=Fheterodyne+Fintermediate frequency. Please tell me what I need to change in the program? Thanks in advance. Vitaly UV5EUG Ukraine, 73!

By: dr.oal

dr.oal — Fri, 25 Aug 2023 05:23:50 +0000

Would be possible ?

By: admin

admin — Thu, 24 Aug 2023 19:56:54 +0000

Nope.

By: dr.oal

dr.oal — Thu, 24 Aug 2023 19:12:09 +0000

Hi, I would like to ask if there are a code & schematic for this VFO without rotary encoder, only with up and down switches.
Best regards

By: Bernardo

Bernardo — Sat, 15 Apr 2023 00:06:45 +0000

I’ve complete check , and compile, but when the system start the Chip of AD9850 , from a few second make hot. I check connection .
Any Idea?
Thank’s

By: N0DBX

N0DBX — Wed, 22 Feb 2023 21:37:33 +0000

I ran into some of this also and found some of the files have been changed in the IDE. (I’m using 2.0.3).

For starters, the following rotary.h library can be downloaded as the Zip from here:

https://github.com/CarlosSiles67/Rotary

That got it to compile. Then the other libraries are in the current IDE but are currently:

EEPROM_24LC64F.h
LiquidCrystal_I2C.h

That worked for me! It works great.

By: Revisit a DDS project – Ordinary Modulation

Revisit a DDS project – Ordinary Modulation — Mon, 20 Feb 2023 01:44:33 +0000

[…] had started on a project in 2018, a little Arduino DDS thing like on this AD7C web page. And the rotary encoder I was using just wasn’t cutting it. It wouldn’t count single […]

By: admin

admin — Mon, 13 Feb 2023 15:15:32 +0000

It will work on the Mega. Read through the comments. Others have done it. You just have to get the interrupts right as they are different on the Mega.