DDS with AD9850 and Basic Stamp microcontroller..(part 1)

I and my friend in group "Thailand Amateur Radio Group" will dicuss at RAST meeting in May. We talk about make DDS project. After we buy a DDS AD9850 module. We go back to a workbeanch for starting our jobs. Somebody used RasberryPi foe control, somebody use adurino and I select Basic Stamp. This for start to re-learning a basic language again (I lean at grade 1 in High school). So shall be lean step by step.

The Basic Stamp 2p24 has feature for I2C communicate to module ,16 I/O ports for connect Encoder, Buzzer etc. and include feature for LCD command.

Now I can write a program for up and down a data and output to screen. Next step make a program for control DDS.

New 20m Invert V Antenna test in 5Watts WSPR

Last week I made my antenna for 14 Mhz band. I gone to Japan in March and brought the Balun BU-50 back to Thailand. When I were making antenna by cut a wire 1 mm dia and ½ wavelength.

Propose for this antenna for using in portable station. I test in WSPR mode at 5 watts because I’m busy, I can’t monitors in 24 hrs. After open the wspr.org to check a result.

My station and new antenna can spots over 700 station. That is good result for new antenna. Next I will try in portable station and other mode.

 

Today QSO result ; 6 QSOs on 20m JT65

14:01  1  -15 -0.3 -22  K E22ICQ JH3IMR -10 

14:28  4  -9 -0.5 794  B E22ICQ RA9JK -12 

14:36  4  -17 0.9 571 B E22ICQ JA1BZJ -08

14:42  1  -15 0.7 544 B E22ICQ JH1QKG -17

15:07  3  -8 -0.8 388 B E22ICQ 9V1LX -09

15:24  2  -3 -0.7 388 B E22ICQ RA0CHK -09

TNX for QSO.

Now operating WSPR. 73

Weekend Project ; Peaberry SDR by AE9RB

Dec 2012, I order a electronic kits from internet. The kits is Software Define Radio and design by Mr.David Turnbull (AE9RB). I got its from a post box in Jan 2, 2013. Then I checked all parts in package and learn instruction in http://makeprojects.com/

After I received a kits from I order in ae9rb.com I saw a good packaged for protect a mistake parts. SMD parts are difficult to check in parts if you have a instruments at you workbench. My order is a set for my first do its yourself.

First step follow as http://makeprojects.com/ print a table for select the bands. I selected 80/30/40 meter bands. A fig show I mark portion of value for those parts.

Then I prepare a inductor and transforme (L1-L7, T1-T5). and next solder an 0.1uF capacitors on PCB.

Warning ; SMD parts easy to broken. Carefully a assembly.

After assemble 0.1uF capacitor should be checking an parts don't fail.

Add D1 , R1, C1, C2, C3, C4 and Socket J2. Be careful a pin of capacitor and pan have small area to solder.

next solder U1 and U2. Instruction inform parts name "NX1117CExxZ". I saw on package indecate "W257CExxZ". Check in datasheet is corrected.

Supply 12-15V for check both regulator. I supply 13V and voltage output are 5.0 and 3.3 V.

Soldering J3, R14, R15, R16, C21, Q3 and check voltage at collector should be 2.0-2.5V. I measure 2.2V. Then soldering U3, U4, R2, R3, R12, R13, R4, R5, J4, J5, J6

This portion carefully a solder. U10, U11 and P1 are small pitch and small pad. My technique add a little Lead-fee on pad before solder an SMD parts. A flux is helpful for easy soldering.

Follow the instruction for assembly parts then a step 20. I can connect to computer by USB and supply a power. The computer should be detect Peaberry SDR. I install driver for download from AE9RB.com and receiver can operate.

Setting on HDSDR. A peaberry SDR should be show in sound card selection.

Step 24 ; Don't forget a mark on transformer T4, T5. May be made misstake assembly.

Final parts Q6, Q7, Q8 after bend I tick a screw and nut before soldering. Just not finish, must be make external LPF.

Weekend job and now a midnight in Thailand. Must be going to sleep.