Archive for category: Amateur Radio

Playing with a buffer amplifier for a DDS…

May 1, 2015 | Amateur Radio | By: Mark VandeWettering

I tinkered together a circuit for a buffer amplifier that I thought would be good to use with the AD9850 DDS board I have. In particular, for the purpose of this exercise, I was trying to preserve the nice sine-wave nature of the DDS input, and present it at the output into a 50 ohm […]

Help wanted for new project… The Big Box O’ RF

April 29, 2015 | Amateur Radio | By: Mark VandeWettering

As I’ve mentioned over the last few months, I have piles of different development boards, and lots of little display modules and the like. I’ve been thinking of doing a simple radio project, aimed at helping further experimentation with QRP (low-power) radio homebrewing. Inspired by Pete and Bill over at the Soldersmoke Podcast, I thought […]

Interested in the history of my callsign: K6HX

April 25, 2015 | Amateur Radio | By: Mark VandeWettering

I was originally licensed under the callsign KF6KYI (Kenwood-Yaesu-Icom, or what I prefer, Kiss Your Iguana) but when I upgraded to Extra a few years back, I dug around and was lucky enough to snag the callsign K6HX (missed out on getting the highly desirable K6TT, which would have been AWESOME). I never really gave […]

Exciting AMSAT-NA opportunity…

April 25, 2015 | Amateur Radio, Amateur Satellite | By: Mark VandeWettering

I read this today: AMSAT is excited to announce that we have accepted an opportunity to participate in a potential rideshare as a hosted payload on a geostationary satellite planned for launch in 2017. An amateur radio payload, operating in the Amateur Satellite Service, will fly on a spacecraft which Millennium Space Systems (MSS) of […]

New arrivals from Adafruit, and minor updates…

April 23, 2015 | Amateur Radio, My Projects, Raspberry Pi | By: Mark VandeWettering

I think Bill and Pete have been having way too much fun with the radio projects centered around the Arduino and the SI5351, so I decided to join them and ordered one of Adafruit’s SI5351 boards (I still have the kit from Jason’s Kickstarter which will almost certainly be better once I get up the […]

A (not entirely simple) LCD display for the Arduino…

April 21, 2015 | Amateur Radio, Arduino, My Projects | By: Mark VandeWettering

I am a big fan of Bill Meara N2CQR and Pete Juliano N6QW, hosts of the really great Soldersmoke Podcast. Together, they chat about homebrewing ham radio equipment, and what they’ve learned in their lessons along the way. Their “tribal knowledge” is of terrific help to someone like me who keeps making small forays into […]

SSTV from the ISS…

April 11, 2015 | Amateur Radio, Amateur Satellite, Space, SSTV | By: Mark VandeWettering

Well, it’s not pretty, but I was just using a 17″ whip antenna on my VX-8GR, recorded it with Audacity, and then decoded it with MultiScan on my Macbook. The first bit of the recording is pretty rocky, so I had to start the sync myself. I’ve bean meaning to do some experiments with bad […]

More on hummingbirds…

April 10, 2015 | Amateur Radio | By: Mark VandeWettering

I imagine that some of you are getting bored with this, so I won’t post another 20 minutes of hummingbird video. But I will post a couple of things. For instance, I cut a frame from the videos at the beginning of the day and at the end of the day. You can clearly see […]

Slow Scan Television from the ISS this weekend…

April 10, 2015 | Amateur Radio, Amateur Satellite, SSTV | By: Mark VandeWettering

Note: This post was adapted by an email that I sent out to our ham radio club. If anyone is interested in a fun little ham radio related activitytonight, you can try to receive slow scan television from the International Space Station this weekend. I haven’t done this in a while,but I think I’ll give […]

Changes to the hummingbird camera…

April 5, 2015 | Amateur Radio | By: Mark VandeWettering

Okay, I got it realigned to better center the frame, and expanded it out to 4×3 aspect ratio. Minutes later, I had got a new capture. Lots of fun! Addendum: Within the next hour, I got the following. I used cropping to give you the image of the bird at the full resolution. Addendum2: Hey, […]

Minor tweaks to Arduino Morse Sketch…

March 30, 2015 | Amateur Radio, Arduino, My Projects | By: Mark VandeWettering

Commenter Andy wanted a version of my classic code that could generate a tone instead of just blinking an LED. I mentioned that I had done this before, but frankly couldn’t find the source code, so I modified my existing program to implement the simplest possible tone: a simple square wave. Rather than using a […]

A 6M beacon using the NT7S’s Si5351 board…

March 9, 2015 | Amateur Radio, Arduino | By: Mark VandeWettering

This morning, the Tweeti-verse (I can’t believe I just used that word) informed me that Thomas, LA3PNA had constructed a VHF beacon using the Si5351, and I was tagged as somehow helping: VHF beacon with the Si5351. code: https://t.co/OkgZXKFSKc , video: http://t.co/hbZl9F76Aj based on code from @brainwagon @NT7S — Thomas S Knutsen (@la3pna) March 9, […]

Old Radio Publications available online…

March 4, 2015 | Amateur Radio | By: Mark VandeWettering

I like reading old books and old magazines. Luckily, the Internet is making a lot of that kind of material available online for free. A couple of quick links to some items I’ve found recently on the subject of amateur radio: Radio News was published from 1919 to 1959. PDF scans of every issue are […]

Partial Solar eclipse underway….

October 23, 2014 | Amateur Radio | By: Mark VandeWettering

Snapped with my iPhone, held to the eyepiece of a Questar equipped with a solar filter…

The Si570 and the Si5351

October 14, 2014 | Amateur Radio | By: Mark VandeWettering

Thomas’ talk about the Minima at Pacificon has got me thinking about building one of my own. I actually have quite a few of the necessary parts in my junk box, but lacked a few things, so I made a quick list and sent a quick order off to Tayda. Tayda has really good prices […]