I’ve been in need of a good way to mount my growing collection of Raspberry Pis (rpi) and to power them from a convenient power supply. Wall warts are notorious for not supplying the correct voltage or meeting the right amperage requirements. To that end, this article was begun.
A bit about my needs, I have a rpi that includes additional hardware in the form of what is called a “hat” and also a SATA hard drive. This hat fits on top of the expansion header on the rpi, and provides additional functionality. For this article, I will be using the club repeater antenna monitor system as an example.
The initial setup consisted of a rpi, a Pi-plates DAQCplate (for Analog to Digital Conversion), and a SATA to USB board for the hard drive. The system runs from a 5Vdc/4A AC/DC power supply (wall wart). During testing under load, the power supply regularly dropped to 4.8Vdc. The rpi requires a voltage between 4.8 and 5.2Vdc. Below 4.8Vdc, the whole system becomes unstable, with possible loss of data, poor A/D acquisition, and a whole host of other issues.
After a fair amount of searching, I came upon a hopefully better approach to the power supply issue, in the form of the Bitscope Blade Uno Pi (BB01). This has a few useful features beginning with a wide range (9 to 48Vdc) power supply which outputs 5Vdc at 3A (4A peak). This allows me to use any of my ham radio power supplies and/or battery systems to power everything. Additional features of the BB01 include an extra 5Vdc power header, and dual USB jacks to power other devices.
More to come soon!
The FT8 presentation from our January 2018 meeting by Robert Webster (WR8RW) is now viewable online or downloadable from our
For clarity, the monthly WCARS ham license testing session starts at 9am. WCARS requests that you show up 30 minutes early (at 8:30am) to take care of any paperwork before your test.
Due to an oopsie on my part adding the test sessions to the calendar, I had folks showing up at 7:30am, my apologies.
Don’t forget to check our calendar for the next available WCARS Ham testing session. You are not required to sign up ahead of time, nor do you need to bring the ticket to the testing session. Our ticketing system helps the club see how many folks are planning to come to a test session, and for follow-up.
Latest Update on the Stratos Project (Eclipse Balloon Launch)
Fleet Thomas Belknap and his engineering colleagues have the following update on their project:
-Funds raised, as of April 3, were $1130 toward a goal of $1700
-The Raspberry Pi and half of the sensors are purchased
-The initial Python program has been written with two additional programs under development.
For more updates on the Stratos Project visit their Facebook page at:
To donate to the project visit their GoFundMe page at:
The team have a forum thread on QRZ at:
An article was recently published on Hamsci about the project. That article is located at:
Their latest video is available at: https://youtu.be/3KZWgAtIovk
Here are a couple of documents for you to download.
Click the link, these are large so for best viewing download to your PC.
The first one is Net-Control 101 operating info:
The Second one is the Materials you need including preamble and getting ready info:
Any Questions on these items contact: Robert, firstname.lastname@example.org
Here is the PDF version of the Presentation from the March Meeting.
The Presentation was very good info, presented by Ethan Poole, KW4EK
Click on Link to download your copy for viewing anytime
Severe Weather Awareness Week Information
In recognition of Severe Weather Awareness Week and the upcoming severe weather season in this area, we have received the following information from Mandell Rigdon (WR4XM) related to the WARNs system and GSP Regional SkyWarn.
The list of repeaters linked in the WARNs system in support of GSP Regional SkyWarn can be found at the following link:
Additional access to the GSP Regional SkyWarn net, in the event of severe
weather, also is available through Echolink and Allstar as follows:
Echolink Node 442775-N4LRD-R
Echolink Node 791726-K9OH-R
Allstar Node 41786 K9OH/R GSPSKYWARN.ORG
There is also a training hosted by the GSP NWS Office in support of Weather Spotters at the following link:
If you have any questions feel free to contact Mandell (WR4XM) at:
email@example.com, or Robert (WR8RW) at firstname.lastname@example.org.
Click Below to Download
Our very own Robert Webster (WR8RW), will be holding a class on how to be a net controller for the 146.61 nightly net, and generally for other nets, on March 25th from 9am to 1pm. The class is open to all amateur radio operators. We do ask that you sign up for this class, so that we know how many handouts to have on hand. You can sign up at the Net Control 101 Signup page. There is no cost for this class. Also, if you have a handheld, please bring it with you for a practice exercise.