N3ZI DDS 2016


Power and Output connectors can be mounted to either side.
Encoder and switches can be easily remoted
Sold as a kit, but with the DDS Chip soldered to the PCB, no other surface mount components.

Simplified LCD wiring. LCD Can be mounted to DDS PCB or remote

Order through Paypal

Version
Your Callsign
Lead time is 1-2 weeks
(Longer for orders for multiple kits)

Sold as a kit.
Only with the DDS Chip soldered to the PCB.
All the other parts are through hole,
and the buyer must assemble and solder those
LCD Module fully assembled and tested.

Standard Version
available with Blue or Yellow LCDs

Vintage Version, 30 Memories
30% Larger Characters

Key Differences between Standard and vintage versions


Feature

Standard Version

Vintage Version

Recommended Application

Homebrew QRP Radios, Xtal controlled radios, and pre SSB radios with wide range VFO.

Collins, Drake, Heathkit SSB radios from the 70's & 80's, with limited range VFO's and Xtal bank. Can be used to add WARC bands to these radios. Most applications require a separate buffer amp.

LCD

16 chars, 2 lines, many others supported.

16x1 Only. 1 line of 16 character LCDs, (14 characters used) no other LCDs supported.

RIT

500Hz default, Set in user setup, saved, but not tunable.

Tunable, resets to 0.0 on band change or power up.

A/B VFO

Yes

No

Memories

11

30

Set Up

Detailed

Easy English Menus

Calibration

Better than 0.1Hz

To 1Hz

Serial Port

Allows Tinkering.

None

Space on LCD for custom

12 Characters

none

Tuning Step

1,10,25,100,1000 + Auto speedup

1,10,100,1000 Hz + 50K for some setup.

Dial Speedup

Yes

No

PCB, Schematic and parts list are the same for both versions, only he LCD and micro are different. You can upgrade any DDS (Oct 2011 or later) to the Vintage radio version, by replacing the Micro and LCD


Manual w/ Schematic, Standard Version
Manual w/ Schematic, Vintage Version

Significant Improvements for 2016 Version:
Prior specs carried over to 2016 version (micro s/w is the same)

1) 1Hz step size.  This was the most requested  improvement, and this chip has it.  Furthermore the LCD will display the frequency with 1 Hz resolution.  I'm going to set the step size to something higher than that, but those of you who demand precision will be able to change the default step size.  The LCD display will show 9 digits of frequency (a sign, 2 megahertz digits, 3  kilohertz digits, and 3 Hz digits.  

2) No (or very little) overclocking.  All these kits will be shipped with 80MHz clock modules.   This along with an improved output filter will allow operation up to 34MHz.

3) Fast RIT and FSK.  This chip has two frequency registers, and there is a direct connection to select between the two.  Switching is instantaneous and phase continuous, you can use it with CW QSK and even FSK (RTTY) is you want.  The push switch on the rotary encoder allows you to set the RIT offset, tuning speed, and calibration.

4) Vastly improved Encoder tuning.  The dial now operates much like an analog VFO dial.  I have an acceleration algorithm that works very nicely, so the push switch for speedup is no longer required.  New debounce and other changes make the action smooth like an optical encoder using an inexpensive mechanical encoder.  There is no lag for the LCD, and no queuing, no glitches,  and catch-up.

5) Phase continuous frequency changes.  The old chip had to be turned off then back on for a frequency change.  So there was a brief but noticeable glitch.  The new chip has phase continuous frequency changes meaning than the instant a new frequency is selected, the output waveform continues smoothly by sloping and the proper rate for the new frequency


Features and Specifications:

Feature

DDS
(sold out)

DDS2

Maximum Output Frequency

20 or 30 MHz

34MHz

Step Size

10Hz

1Hz

LCD Display Resolution

100Hz

1Hz

Tuning Speed

500ms per step

Instantaneous

RIT

None

+/- 1Hz to +/- 10MHz

QSK support

No

Yes

LCD update lag

500ms

not perceivable.

Tuning

Discontinuous (glitch)

Phase continuous (no glitch)

Number of Surface mount parts

1 16Pin TSSOP

1 20Pin TSSOP

Memories

10

10

A/B VFO

Yes

Yes

FSK and PSK support

None

Yes

LCD Included

Yes

Yes

Works with 3rd party LCDs

Yes

Yes

Encoder Included

Yes

Yes

Chip Used

AD5932

AD9834