Table of Contents
Summary of Contents for EA3GCY ILER-DDS
- Page 1 ILER-DDS V2.1 Assembly manual Last review: February 1, 2018 ea3gcy@gmail.com www.ea3gcy.com. Latest updates and news: Thanks for purchasing the “ILER-DDS” VFO kit Enjoy building QRP ! 73 Javier Solans, ea3gcy ILER-DDS V2.1 VFO/DDS. Page 1...
-
Page 2: Table Of Contents
DIGITAL NOISE………………….…………..………………………………………………..12 ILER-DDS WIRING………...……………………………………………………………………... 13 SCHEMATICS……………………………………………………………..……………………..13 PART TWO: PROGRAMMING AND USING THE VFO/DDS ..…..……………………..FACTORY CONFIGURATION……………….……………………………………………...…. USING THE ILER-DDS……………...…………….……………………………………………… 15 USER MENUS………….………….…………….…………………………………..…………… MENU FLOWCHART………………..…….……………………………………………….…… CONFIGURATION………………..……………….……………………………………………… 18 ANNEXES………..………………..……………….……………………………………………… 22 IF YOUR KIT DOES NOT WORK AFTER FINAL ASSEMBLY …………………..…………... -
Page 3: Introduction
Due to the very high frequency reference (125 MHz), the ILER-DDS offers a very clean signal when working at relatively low frequencies as 11, 20 or even 30 MHz. (< 25% of the reference frequency). If you want to delve deeper into the theory of DDS we advice you to read the abundant internet literature. -
Page 4: Part One: Assembly And Installation
It is a good idea to drag the tip of the iron up the component lead as you remove it from the joint, this helps to pull any excess solder up with it and enables good flow along the component lead. ILER-DDS V2.1 VFO/DDS. Page 4... - Page 5 The transistors have the silhouette printed on the board. The diodes must be placed in the correct polarity position, they have a color band on their body that must match the printed drawing on the board. ILER-DDS V2.1 VFO/DDS. Page 5...
-
Page 6: Parts List
Pins strip Pins for connections Connections Pin strip sockets Cut with various measures. Connections Heatsink for IC2 Heatsink for IC2 Heatsink M3x10 screw Screw for IC1 heatsink Heatsink M3 nut M3 nut for M3x10 screw Heatsink ILER-DDS V2.1 VFO/DDS. Page 6... - Page 7 < R5 (less): increases backlight (R5 can never be 0 Ω). If you want the maximum level of backlight you can connect the pin 15 of the LCD directly to 5V, but note that you can increase the total consumption by about 20mA. ILER-DDS V2.1 VFO/DDS. Page 7...
-
Page 8: Assembly
ASSEMBLY As many modern kits, the ILER-DDS is designed to be easily assembled by medium-experience builders. SMD components are already installed and there are no hard-to-install parts on the kit. It is advisable that you inventory all parts to make sure everything is available and ready for assembly. -
Page 9: Installation
TX INPUT (RIT) to GND on TX S-METER INPUT SINE WAVE OUTPUT B (from AD9850 module no LPF) OUTB SINE WAVE OUTPUT A (AD9850 module LPF built in) OUTA SQUARE WAVE OUTPUT B SQRB SQUARE WAVE OUTPUT A SQRA ILER-DDS V2.1 VFO/DDS. Page 9... - Page 10 Wiring"). Take care when planning the configuration most suitable for your application. As you can see, the ILER-DDS block is designed to be easily incorporated into any existing rig, being receivers, transceivers or as a general purpose laboratory RF generator.
- Page 11 DDS. Then, a DPDT switch must be used to route the supply for the DDS on one of the circuits, and to connect L7 with the pad where it was connected previously (VXO supply). ILER-DDS V2.1 VFO/DDS. Page 11...
-
Page 12: Digital Noise
When you install the encoder, please remember to place a pair of 100nF capacitors on the encoder terminals. If you do a careful and tidy wiring of the ILER-DDS, we are sure that you will get excellent results. Note: EA3GCY can’t guarantee the result of fitting an ILER-DDS with receiver or transmitter kits others than the ones from ea3gcy. -
Page 13: Iler-Dds Wiring
For the output signal use good quality, fine coaxial cable (ej. RG-174). Place the encoder as close as possible to the ILER-DDS block. If it is far away, and wires go by or over the transceiver circuit may introduce switching noises whenever the encoder is used. -
Page 14: Schematics
Please notice that none of the two models the "common" terminal is central. It is to the right. Solder two 100 nF capacitors directly to the encoder pins (between active pins and ground). SCHEMATICS ILER-DDS V2.1 VFO/DDS. Page 14... -
Page 15: Part Two: Programming And Using The Vfo/Dds
PART TWO: PROGRAMMING AND USING THE VFO/DDS FACTORY CONFIGURATION The ILER-DDS is configurated to work with the ILER-40, with the following parameters: LOWER LIMIT: 07.000 (Band lower limit: 7.000 MHz). UPPER LIMIT: 07.300 (Band upper limit: 7.300 MHz). YOUR CALL ?: CALL ON: EA3GCY IF FREQ: IF = 04913500 Mode: VFO = RF + FI ( for ILE-40) IF is 4.913500 MHz and the output mode from the VFO/DDS is 7.000000 MHz + 4.913500 MHz... -
Page 16: User Menus
By turning the encoder you will enter a submenu to select with the encoder the step sequence needed. A quick push on the encoder will bring you back with the new sequence active. Note: The “ALL STEPS” option is meant to be used when the ILER-DDS is used as RF generator. S-METER o VOLTS:... -
Page 17: Menu Flowchart
LCD will turn off and the encoder will remain inactive. To recover push the encoder for more than 1 second. EXIT: E X I This menu entry allows you to go back to the frequency dial without changes. You only need to make a quick push on the encoder. MENU FLOWCHART ILER-DDS V2.1 VFO/DDS. Page 17... -
Page 18: Configuration
Once the frequency is set, make a quick push and the ILER- DDS will start-up normally. Note: If you plan to use the ILER-DDS as RF generator you may adjust the limits to the ones you like for your generator, even 0 and 40 MHz! UPPER LIMIT: Keep turning the encoder until you see “UPPER LIMIT”... - Page 19 When you will get to the 8th position, the next push will store the last digit and the ILER-DDS will jump with to a second submenu where the IF Mode will be selected.
- Page 20 IF tolerances. - If you are using the ILER-DDS for an SSB transceiver and you have access to a good receiver, tune it to the frequency shown on the display and check your transmission on the receiver while you speak.
- Page 21 S-METER CAL: The S-METER calibration of the ILER-DDS allows to “SAVE” the level of signal strength for each one 10 intervals from S-0 to S-9. In addition, the settings are independent for each level, so that it can be literally...
-
Page 22: Annexes
You must add a resistive / 3 divider with a 47K resistor and a 22K resistor plus a 1uF capacitor to filter out fast variations in the audio signal. In this way we can send to the ILER-DDS a voltage margin of less than 4.9V. - Page 23 You can also experiment by building a small adapter circuit that takes audio signal (before volume control) and converts it into a suitable voltage level for the S-Meter input of the ILER-DDS. Note: EA3GCY Kits is not responsible for the failures caused in ILER-DDS due to improper use.
-
Page 24: If Your Kit Does Not Work After Final Assembly
CONNECTING THE INPUT RIT (TX) To use the RIT function (tuning increment in reception), the ILER-DDS needs to know when the transceiver changes to TX. Pin 8 is the RIT input of the ILER-DDS. When this entry is connected to GND, the ILER-DDS interprets that it is in TX. -
Page 25: Limited Warranty
If you plan to ship it back, PLEASE CONSULT how to do it to ea3gcy@gmail.com Javier Solans, ea3gcy, guarantees that when the kit is built and adjusted following the information enclosed in this manual, and it is used according to the advices mentioned, it will work according to its specifications. -
Page 26: Output Signal Images
OUTPUT SIGNAL IMAGES 10 MHz output signal. Perfect sinusoidal form. 10 MHz output signal. Harmonics hardly appear. 20 MHz output signal Second harmonic better than -50dBc, the third harmonic does not appear. ILER-DDS V2.1 VFO/DDS. Page 26...
Need help?
Do you have a question about the ILER-DDS and is the answer not in the manual?
Questions and answers