Lecture and Lab 7/27/2019: A UPS for your RPi!

raspberry pi FMV34K4JU31TTMJ.LARGEThis Saturday’s Lecture and Lab will focus on a DIY Mini UPS suitable for use with a Raspberry Pi or charging your phone. It has 5v and 12v outputs and uses only 1 18650 Battery.  The cost will be $10.  Bring your soldering iron, hot glue gun, clippers and screwdriver.  If you don’t have any of the above, we will have extra on site.

If you’ve got something else you need to work on, don’t worry! All the “regulars” will be bringing our tools, and we’ll do our best to help.

Lab And Lecture May 2019

Anderson Power Pole Workshop

Anderson Power Pole

Join the DARC for Lab and Lecture May 25, 2019 from 10am until 3pm at the Dallas Medical Center. This will be an Anderson Power Pole Workshop – This Workshop will give you a complete overview of Anderson Power Poles and how they are used in HAM Radio. Participants will have a choice of five different Power Pole accessories to purchase and build.

Continue reading

Lecture and Lab Presentation 08-26-2018: Measuring Return Loss with the RTL-SDR

return loss plot_cropSeveral club members and guests have asked if I can share my presentation…so here it is!

Some links you might find helpful include:

The scanning and comparison software that we installed and practiced using, RTLSDR-Scanner: https://eartoearoak.com/software/rtlsdr-scanner

The “runner up” software that can, sometimes, display spectrum graphs in real time, Spektrum: https://github.com/pavels/spektrum/releases (be sure to use version 1.2)

Continue reading

Lecture and Lab 08-25-2018: What to Bring

analyzer setup IMG_20180710_142419262This Saturday’s Lecture and Lab should be a fun one: we’re going to learn about different ways to turn our RTL-SDR USB dongles into antenna analyzers. Bring yourself and your curiosity. Bring $45.00! Bring your RTL-SDR dongle. Bring your favorite ideas about what to do with the RTL-SDR. We’ll have time to talk about them. Besides all those things, you should bring:

    1. A laptop computer. A Raspberry Pi might not have the horsepower, but if you’re stubborn, you can try.
    2. You’ll save time if you download and install the software we’ll be using. We’ll start by doing things the easy way, with the RTLSDR-Scanner. The installation is very easy for Windows, but a little more involved for Mac or Ubuntu. If you have a Windows or Linux laptop, you can also install version 1.2 of Spektrum, which we’ll discuss and experiment with.
    3. Bring your RTL-SDR Dongle! We will not have any for sale. If you’d like to support the club, your could order a dongle or a dongle with small dipoles through smile.amazon.com.
    4. A 12-14V power DC power supply for your noise source. It helps if it has a variety of barrel connectors so that you can be sure of having the right one. It can be very low power; only 0.2 amps are needed.
    5. Bring an antenna to measure. You can even bring more than one. (You can bring a lawn chair to analyze! Have Fun! —KE5ICX) We’re going to have plenty of time to measure antennas, experiment with the scanning software, and share our favorite tips and tricks for the RTL-SDR.

 

Lecture and Lab 08-26-2017: What to Bring

We will have several extra sets of parts at the August Lecture and Lab, so don’t panic if you forgot to pre-register. What should you bring with you to the build?

At the very least, you’ll want to bring your choice of feedline connector. For many hams this will be a panel-mount SO-239, but you might prefer a panel-mount N or BNC. You’ll also need to bring some electrical tape, and possibly some coax if you want to test your antenna. A soldering iron and some solder will help you make much stronger connections.

Continue reading