KD8CEC Amateur Radio

  Release DVPI Version 1.0 Version 1.0 and Version 0.95 are the same.  If you are using Version 0.95 you do not need to update to Version 1.0.  DVPiManager has some features added.  If you want to use features added in Versio 1.0, you only need to download dvpimanager. DVPi uses the USRP Client protocol.  When you install and use DVSwitch, you must read and comply with the license that appears. The user is responsible for the license for the use of DVPi.

Release DVPI Version 0.95 Version 0.95 is a candidate version of Version 1.0 so, If there are no major problems you won't need to upgrade to Version 1.0 DVPi uses the USRP Client protocol.  When you install and use DVSwitch, you must read and comply with the license that appears. The user is responsible for the license for the use of DVPi.

 Release DVPi Version 0.88 - Dual Mode, D-Star, Function Key 2 DVPi uses the USRP Client protocol. When you install and use DVSwitch, you must read and comply with the license that appears. Version 0.88 is a test version. If you want a stable version, please wait for Version 1.0.

 DVPi schematic final version I know some nice PCBs are designed for DVPi. I also ordered 5 samples of the PCB designed by EA7GIB and recently received it. However, I had to add one LED and one switch to the needs of users. But this is just an option. Add this feature only if you need it.

DVPi hardware expansion (PTT, Encoder and etc) DVPi can be used without any additional hardware. A Raspberry Pi, 3.5" LCD and USB sound card are enough for DMR communication. However, if you want to use DVPi more conveniently, or if you like to make it, I think it is good to configure the hardware as follows. This hardware is the final version. No hardware will be added to the DVPi anymore.  I would like to introduce the DVPi hardware expansion into several types. You can create DVPi the way you want. 

Create Network Transceiver - DVPi Audio In/Out adjustment I will make a video for this post and post it on YouTube. (Next monday) Describes the settings for DVPi audio input/output. If you are familiar with Linux, you probably already know. In particular, if you are transmitting too loud or too small when you are TX Mode, be sure to read this article. This is very important for using DVPi well, Let me explain how I set it up.

Creating Network Transceiver using DVSwitch (or DVLink) # 2.How to use I upgraded DVPi to Version 0.4 today. The download location is the same. The functionality has not changed. It just changed the default volume of the Raspberry Pi's speakers and microphone. (Speaker : 100%, Mic : 80%), Also, the button position of the Menu Screen has been changed slightly.

Creating Network Transceiver using DVSwitch (or DV Link) #1-install and basic setting DVPi is a client program that communicates with DVSwitch.Please be aware of the licenses that arise when installing and using DVSwitch. Follow the instructions that appear when installing DVSwitch or the instructions on the DVSwitch site. I am not responsible for DVSwitch and the programs contained in DVSwitch, and I am not responsible for the use of DVPi.  Please use it only if you agree to this. I want to make a simple Network Walkie Talkie using the Raspberry pi. After downloading the image, write it to the SD-Card and enter the server information in the ini file.  It's a simple task, but I wrote it step-by-step, making the article longer. If you have a Raspberry pi experience, you don't need to read this article in detail. I uploaded all the contents of this article in a video and uploaded it to YouTube. I'll link to the video at the end of this article.

I have several types of Raspberry Pi boards. The Raspberry Pi board is probably one of the most sold boards in recent years. Raspberry Pi boards are inexpensive and have great performance. The best thing is that you can use Linux. The figure below is a collection of RPI V1 to V4.  It is RPI V1 The board on the right in the photo below is a recent RPI V4. Already, amateur radios are using a variety of Raspberry Pi boards. I am trying to make something new. For example, network radios for amateur radio, Devices using Wsjt-x I experimented with cheap USB sound cards for the new project. All are USB sound cards under $4. The sound quality was all poor. However, the RPI's fast CPU will enable DSP functionality. Below is a $2 USB sound card with a cable attached to it. All are compatible with RPI. Below, I thought it was possible to input a 2CH microphone with a $4 USB sound card. However, it was only 1CH microphone inpu...

Raspberry Pi GqrxSDR with uBITX (Examples of using RTL-SDR in uBITX #4) CAT Support uBITX Firmware CEC Version supports SDR connections from Version 1.07. http://www.hamskey.com/2018/04/how-to-connect-sdr-rtl-sdr-to-ubitx-and.html

RPI Modification for Wsjtx-Portable -Built-in sound card (usb type) -Built-in GPS (usb type) -Added power connector on the side

How to use Wsjtx-Portable (Wsjtx 1.8.1 based Small LCD version) This article is based on Wsjtx-Portable Version 0.5. The video you shot while creating this document are at the bottom of this document.

The portable wsjt-x device in pocket is now named. As the title says, it's simply called Wsjtx-Portable . Wsjtx-Portable is a Wsjt-X program-only device in pocket. I wanted to make it available for use in SOTA, qrp, automobiles and outdoor.

The following link explains why created WSJTX-Portable. http://www.hamskey.com/2018/01/find-and-fix-bugs-in-non-debug.html

I'm posting this experience to help new programmers. This article shows how to solve problems for new programmers. I do not think my method is the best. I think that it is one of various ways to solve an issue. A program called WSJ-X started to become popular. It was a great program. even the program is open source based.

Nowadays, digital communication is popular in amateur radio. JT65 and FT8 are capable of DX communication with weak signals. In the era of urbanization, the space for installing antennas is gradually diminishing. So we seem to prefer communications that can be transmitted away with weak signals. Install wsjtx, the most representative software for weak signal digital communication, in Raspberry Pi. The basic setting for Raspberry Pie is 'Raspberry pi 3 Setup (basic)' on this blog. http://www.hamskey.com/2017/12/raspberry-pi-3-setup-basic.html If the installation order changes, it may not work normally or you see the many erros because wsjtx uses other libraries. 0.Turn on Raspberry PI 1.apt-get update   Click Terminal Icon on taskbar   type 'sudo apt-get update' [enter] 2.Click Raspberry pi Icon on taskbar -> Preferences -> Click Add/Remove Software 3.type 'fldigi' enter on left top edit box 4. Check all items 5.Press ...

1.Items   Raspberry pi 3 or 2   SD Card   SD-Card Read Writer   and Computer... 2.Down load Raspberry pi OS Image   https://www.raspberrypi.org/downloads/raspbian/    Click Raspbian desktop  you choice option, direct download (Download Zip) button, and download via torrent (Download Torrent) button 3.Extract the downloaded file. 4.Download & Install Win32diskimager   download from https://sourceforge.net/projects/win32diskimager/   5.Insert the SD card into the SD card reader. 6.Connect the SD card reader to the computer. 7.Run Win32diskimager    Select to extracted Raspberry pi os image. Select Device (SD-Card Drive) 8.Click to [Write] Button Confirm the disk name and press Yes. (Warning) If you do not select SD-CARD and chose the hard disk, you lose data. 9.When all the processing is completed, remove the SD-Card from the reader. 10.Insert the SD-Card into th...