มาออกแบบระบบทวนสัญญาณกันเถอะ

ได้มาเป็นวิทยุสมัครเล่นเกือบปีเลยเกิดอาการคันสมอง อยากทำนู้นทำนี่ต่างๆน่า วันนี้มีความคิดออกมา ว่าทำเครือข่ายระบบทวนสัญญานไว้ใช้ก็ดีน่ะ เลยคันไม้คันมีเขียนเก็บไว้ดูบ้าง

ระบบทวนสัญญาน หรือ Repeater เป็นการนำสัญญานเสียงหรือสัญญาณข้อมูล จากจุดหนึ่งมาถ่ายทอด ณ อีกจุดหนึ่งที่คู่สนทนาสามารถ รับสัญญาณของเราได้ดีกว่าจุดของต้นสัญญาน

LimeSDR Mini | เครื่องรับส่งวิทยุย่าน HFถึงSHF

https://www.crowdsupply.com/lime-micro/limesdr-mini

ผมมองหาอุปกรณ์SDR แบบที่สามารถรับส่งคลื่นวิทยุได้ limesdr ผมเห็นมาได้สักพักแล้วแต่ราคาสูงถึง300ดอลลาร์

ตอนนี้เห็นออกรุ่นมินิออกมา ราคาอยู่ที่200ดอลลาร์ทำให้ยังพอนำมาทดลองได้

คิดว่าน่าจะทดลองประมาณ2ตัว คงจะพอ กับการทดลอง เดียวถ้าได้ตัวอย่างแล้ว จะมารีวิวกัน

More design for WSPR from W3PM's Project

I reading data from web of W3PM. He has many experience project for wspr . Those project easy to build. This is a reference for me in next model. See links  http://www.knology.net/~gmarcus/

 

73 / E22ICQ

74HCT74 simulation

Simulation for 74HCT74 (or 74HC74) results in my circuit.

Simulation Program ; LTSpice

【Daily project update】3D data for checking clearance of assembly

3D data is a good feature for checking dimension of PC-Board in term of mechanical.
After make position of PCB such as assembly part to board. Some parts need area for those bodies.
Many parts are OK to plate on board if dimensions of parts are correctly.

PCB Program; Design Spark PCB

3D Program; Solidwork with Circuitwork feature.

Eagle data convert to DesignSpark data

Many ham radio designer just make a equipment by them-self. Most favorite software for they design is Eagle PCB Design. I start an learn and use Design Spark PCB design. When I find data by other ham design, I need convert to use in my software. Design spark can open a intermediate data from Eagle format. 

I try to convert data (Data from www.qro.cz below ) . Open its, and run ULP then use template from Design spark for convert to intermediate data (*.eip for PCB, *.eis for Schematic) , Final open on Design spark and little modification (If data correctly ). That its.

# This process just you have both software in PC.  

【Daily project update】draft pcb actual side issued

Completed  a lay all components to 100x120mm. PC-Board. This side was small, components will close and track are difficult wiring. It's may clause interference between signal. Next check all components in market.

Update PCB for sdr

After revised circuit of SDR. Circuit idea from YU1LM and I improve a oscillator for using AD9850 module. Side of PCB applied for aluminum case 100 x120 mm.

And idea for Font-end may I separated box for control

73

E22ICQ

Building SDR Board.

This is SDR circuit base on Softrock TX/RX ensemble but find a local components. Target a project for using in VHF band. So step by step for design.

Interface a headset for yeasu

I promise my friend to make a headset and foot switch. He like a contesting and he give a foot switch to me and request to build interface. Now a first design a PCB was inform to him. 

Foot swith can connect with RJ45 at font of tranceiver. The interface's design to connect headphone and external mic. The foot switch connection with paralle to the PTT pin and ground.

Hopefully my friend and his son enjoy the contesting.

73 

SDR tranceiver

SDR for ham radio is growth to recommend in shack. I have a peaberrySDR and home-brew SDR HF receiver. Now I try do a build my own design. target is for using in VHF band that is for moon bounce experiment. 

iAPRS v2.0 new update for tracking your mobile phone.

After I updated iAPRS in my iphone.

I found new feature for tracking my Iphone and send data to openAPRS.org server. I can change add massage and disable a sleep mode for continue tracking position. Checking again two and three days  for more new feature. 

Project the Shack room ; Starting a plan (1)

Happy a new year. It's will late to say that but it's OK.

This month I just a big plan to making a shack room in my house.

I read a presentation from AB1OC in http://stationproject.wordpress.com.

This is a good reference for building a Shack room.

When I draft the room for 3 x 2.2 m. area and paste a tower near room on top floor.

I just design my room on the top because I live in residential and my landscape has a flood in some year.

This position is better. I guess a problem of ground wiring but I find a best solution.

Around my home is clear view and near a river. Expect north view was tall house.

Next we just plan all rig in my station.

73 / E22ICQ

facebook.com/e22icq

3 axis CNC for milling PCB - Part 2

From the draft of CNC machine. I cutting and drilling  the woods. Assembly all cut wood for checking dimension and area of Plan working. It's reduce to 140 x 190 mm. Next jobs find the milling motor and assemble the Axis motors.

3 axis CNC for milling PCB - Part 1

Draft the Rubber Woods for making CNC Machine. This will be using 14 parts for assemble. Rubber woods found in local store. This design can working area in 200x250 mm. Enough for milling PCB.

Now! We will order the woods. Estimate cost for woods is ฿800.

SDR received JT65 on 20m

Sunday I test my homebrew SDR. I get information from YU2LM's Website. Select design single LO Frequency at 140625 kHz generate from Crystal Oscillator. JT65 operating in 140760kHz. This is on range of my SDR. While operate with long wire antenna. I received first QSO between BV7RJ and JA1PLT and signal at -24db. So I think very weak but it good for experiment. It first time.

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.