Folks, this has been a fun and hilarious winter project. Yesterday, when I built this air cannon antenna launcher it was -4 degrees outside and this was a perfect evening project to put together. For years, me and my two ham radio buddies (WR8S Bill Shultz and WV8TG Tom Graf), have enjoyed ARRL Field Day activities and usually used a slingshot and a 3/4 ounce fishing sinker weight and an old Zebco fishing reel (with 20 pound test line) to shoot and suspend our doublet dipole antennas high into the trees. Certainly, the slingshot worked pretty much flawlessly… but… boys will be boys, and the idea of an air cannon / spud launcher / potato gun type system seemed to be a new desire. (Most people, our wives included, wouldn’t trust our 3-man team with a slingshot, let alone a potato gun! But I digress.) Actually, our local ham radio club (Monongalia Wireless Association) had a version of a potato gun antenna launcher, so we decided we needed one of our own… and to make some design modifications in the interest of… “science”… plus our own sadistic pleasures. (Make sure you read below WV8TG’s initial “pressure test” experience.) The following pictures hopefully provide the basic concept and parts we used. Tom and I split the cost of the parts needed to make launchers and each built our own version, but they both are the same basic design with only length dimensions of the air chamber and barrel being the difference.
All parts where sourced from our local Lowes store in their plumbing department, except the Schrader valve which can be purchased at an automotive store. Total cost about $40 but you could make a couple of them as a joint project with a friend and reduce that cost per launcher a bit. I got a small rubber gasket for the outside nipple of the Schrade valve to act as another seal on the exterior of the air chamber. You will need to drill holes for Schrader valve, barrel slug stop and projectile slug caps to attach the screw eyes to attach the fishing line. I used 3 inch PVC for air chamber, 1.25 inch PVC for the barrel and short sections to mate the air chamber, trigger valve and threaded barrel. The projectile slugs were made from 3/4 inch PVC and caps and I filed off the nubs on the caps with a Dremel tool for a smooth fit into the barrel. I used PVC Prep on each joint before applying the glue. When gluing joints together, insert the sections together and twist a quarter turn for a solid adhesion. Let all glue set up for 24 hours before testing air pressure chamber. I will pressurize the chamber inside and let it sit overnight to see if it loses any pressure. It’s too cold right now to take outside in -4 degree temperatures to test, but I will use a bicycle pump with a pressure reading valve, and start at 40 psi… then 50 psi… and then 60 psi for test shots to see how it functions and check for any air pressure leaks. We use 60 psi for our club launcher.
WV8TG (Tom) charged his air chamber (barrel not attached) and let it set overnight to test for chamber air leakage. When he opened the trigger value… there was NO leakage… but there was a sudden LOUD release of 60 psi air gush out of a 30 inch long, 3 inch wide fully charged air chamber. He indicated the compressed air release was… impressive. However, his wife was not impressed… nor was she aware of the scientific test that was taking place. #surprise! #WHOOOOOOOSH #loudwifeexpressions I have no reason to doubt Tom will find his projectile slugs in the next county using his design. The club chamber was 12 inches long versus his 30 inch air chamber. #overkill? I designed my air chamber for 14 inches and will conduct all tests… outside. #potentialmeanwife
As soon as I get my Yaesu System Fusion FTM100-DR online, I want to mate my Bencher paddles to the new MFJ-490X Menu Driven Memory Keyer that I picked up at the 2016 Dayton Hamvention last week (May 21, 2016). I am itching to get these two toys working in some CW / More Code Contesting very soon! 5 programmable memories plus all sorts of keyer speed, weighting, side tone, hand key capability, serial number decrements, random code practice, iambic settings, etc.
(See video below!)
MFJ-490X Memory Keyer Instruction Manual
In March of 2015 I took my test for Extra Class and passed with flying colors. I then did some searching for a unique vanity call sign that would have the letters “WV” somehow incorporated for “West Virginia” initials. None of the 1 X 2 calls were available, so I fixated on variations of a 2 X 2 call. I tried prefixes of W? A? K? N? followed by 8WV. After some thought for use in a contest, I settled on a “WT” prefix since you don’t tend to hear many “WHISKEY TANGO” prefixes… soooooo…
WHISKEY TANGO 8 WHISKEY VICTOR
A buddy of mine in the ham club said, “That’s a lot of whiskey’s…” I told him I am fond of whiskeys and love West Virginia… hence the new call sign. Eighteen days later the FCC granted my first choice and I retired my old call sign, “KB8FIR” and before that my original call sign from the early 1980’s was “KA8LJO”.
I set up LOTW and it was not as hard to do as I was led to believe! I have the TQSL’s for all 3 of my ham radio licenses dating back to the 1980’s… KA8LJO… KB8FIR… and now WT8WV… here are some helpful videos to assist you in getting it up and running fast and easy. (I learned a lot by watching the videos before I even downloaded it!) I will add links to LOTW at the end of this post so you can get everything you need.
Kent Morse Tutor
Android App available from Google Play
HELP TO LEARN, IMPROVE AND MAINTAIN YOUR MORSE CODE PROFICIENCY
The FREE KENT Morse tutor app generates random Morse code in groups of 5, or random length groups of 1 to 10 characters and lesson lengths of up to 250 groups of characters.
The selectable letters, numbers and punctuation’s can be played individually or in any combination.
Code speeds from 5 WPM to 40 WPM can be selected in 1 WPM steps, and an independent delay can be inserted between characters. This feature allows you to learn each character at the correct speed but allows thinking time between characters. as you improve, the delay can be reduced.
The tone can be set between 500hz and 1750hz
Cool Android App to help you turn into a CW Pro! Learning the Morse Code is not hard and adds extra fun when you warm up the radio. Click on the link above from The DXZone website for more information about the smartphone app.
I stumbled onto this really cool website called RigReference.Com and was able to find some information on several older pieces of equipment I have in my ham shack. Here is what their website says…
Who we are
RigReference.com is designed for and by Ham Radio enthusiasts. RigReference.com provides information about new and vintage amateur radio equipment (rigs) and allows and encourages members to share their opinions about these rigs.
RigReference.com is always looking for amateur related news, especially new equipment announcements. If you’ve seen or heard anything interesting please don’t hesitate to contact us!
RigReference.com explicitly does not sell ham radio equipment and/or parts.