I’ve been tripped up several times now with my 4SQRP T41 because of the extended headers used to construct the Teensy/Audio Adapter stack. The thin stamped header pins, similar to those on the left in the picture below from the AI6YM v12 T41 kit, don’t always make good contact, leading to hard to trace problems …
Continue reading “Poor Teensy Pin Contact with Stamped Header Pins”
I speculated in a recent Reddit post that some 48kHz spurs that I saw in the T41 output spectrum when using T41EEE-9 were “LO frequency related and may be addressed with calibration”. The first part of that is likely true, the second probably isn’t though I haven’t confirmed it because of the process involved with …
Here are some links to Reddit posts I made concerning the 4SQRP T41 kit: Teensy Pin Usage and Updated Audio Design GitHub Hardware Related T41 Software
Here are some links to Reddit posts I made concerning the 4SQRP T41 kit: Teensy Pin Usage Audio Design and Restructured GitHub Hardware Related T41 Software Other T41 Related Projects
This preserves the Reddit T41-EP community Wiki. It is mostly focused on the 4SQRP T41 kit and isn’t being updated. I doubt the Reddit page will disappear, but who knows how Reddit will treat low activity communities as they seek to increase profits. T41-EP Wiki My goal for this Wiki is to consolidate the available …
Since my last post, I’ve been writing about my ham radio related activities in two Reddit communities, r/HamRadioHomebrew and r/T41-EP. They have mostly served as my blog over the past several years. I like the less formal nature of the post/comment format compared to what I had been posting here. The ability for spam free …
With my CW Messenger project complete, I can loop back to my S-Pixie project again and begin testing its transmitter. I’ll use the CW Messenger to help with testing until I become proficient in CW. I’ll start with some simple calling CQ tests of the PCB build, mostly because I’m curious to see what this …
This is a compilation of posts I made on the r/HamRadioHomebrew Reddit community documenting my build of the CW Messenger. I’ve expanded on those post where appropriate to provide more detail on the build. It’s Like a Puzzle I started the CW Messenger build by imagining the final protoboard with all of the components on …
Continue reading “CW Messenger: Protoboard Build Start to Finish”
I built part of the CW Messenger on breadboard to further test the CW Messenger software. Here is a video of it “sending” message #1 (note that I haven’t modified the author’s original stored messages yet). Notice anything in the video? The software is working as expected, but the buzzer is only clicking. That’s strange! …
I came across a book, Microcontroller Projects for Amateur Radio, that has a number of interesting projects that may interest some of you. Chapter 10 covers a CW memory keyer (one down from the top on the left). I decided to put testing of the S-Pixie transmitter on hold to start this project. It should help …