Category: K6ARK Portable Radio

Fellow YouTuber, 2E0UKH told me about a 2 element dual-band beam he built. I ran with the idea and made my own, out of arrow shafts, with an additional element. The results? Pretty dang impressive.
2E0UKH YouTube Channel: https://www.youtube.com/user/ukgadget2

MMANA GAL file: https://drive.google.com/file/d/1IQ8l_cLdpa7m4fzYdZe1jQMwLSZQOqi1/view?usp=sharing

Antenna Photos – SWR and Patterns: https://photos.app.goo.gl/GAKAw9uykCkPEijr7

Element Lengths and Positions:
– Driven element
– Position: 0"
– Element Length: 20.17" (ea.)
– Director #1
– Position: 3.78"
– Element Length: 19.05" (ea)
– Director #2
– Position: 13.26"
– Element Length: 18.36" (ea)

SUPPLIES:
Arrow Shafts: https://amzn.to/3oDgpuM
– Note: you can likely find them a little cheaper on AliExpress.com
Threaded Inserts: https://amzn.to/37UQhWm
Arrow Connector: https://amzn.to/3oFrTOA
– Note: you can also just use a threaded rod and a jamb nut or some LocTite to secure it

HARDWARE:
Nylon Threaded Rod: https://www.mcmaster.com/nav/enter.asp?partnum=98831A330
Aluminum Threaded Rod: https://www.mcmaster.com/nav/enter.asp?partnum=93225A675
… more durable alternative
Stainless Steel Threaded Rod: https://www.mcmaster.com/nav/enter.asp?partnum=95412A882
Nylon Spacers: https://www.mcmaster.com/nav/enter.asp?partnum=94639A534
Aluminum Hex Nut: https://www.mcmaster.com/nav/enter.asp?partnum=93181A009

Key Build Tips:
– Use a drill press. Hand-drilling will not result in straight enough holes.
– Remove the anodized coating from the inside of the arrow shaft before crimping in the inserts. The coating is non-conductive.
– Apply dielectric grease to the outer part of the threaded insert to prevent corrosion.
– If you over-crimp the inserts, you’ll have to re-drill the clearance hole portion and re-tap the threads.
– Be careful installing threaded aluminum rods, as the threads can be easily damaged.

Have fun building, and good luck!

K6ARK Portable Radio shirts for sale (thanks Jason!): https://grapevineamateurradio.com/products/k6ark-portable-radio-t-shirt-special-order

#MNHR

People often ask how I record my QSO audio for my videos. Well, here’s how.

This quick tip is a little longer than the others, but I figured it was worth giving you the full picture of how I record my audio.

The recorder I use:
Sony ICD-PX370 Mono Digital Voice Recorder with Built-In USB Voice Recorder – $43.00
https://amzn.to/2I9Gqkx

A newer, stereo recording model with rechargeable internal battery:
Sony ICD-UX570 Digital Voice Recorder – $74.79
https://amzn.to/34IHxQ0

Short Aux Cable: https://amzn.to/2SGMB1F

Over 10 years as a ham and no satellite QSOs in the log. But, to be fair, that’s mostly for lack of trying. I recently decided I should give satellites a try

I built a portable 3 element dual-band yagi and have been itching to try it out. Hooked up to an HT, I was able to hear QSOs on a couple of amateur satellites and the ISS over the past couple of days, but I was unable to make any contacts. Suspecting inadequate power was the issue, I hooked up the FT-857 in "split" mode and gave it a shot on a low pass of AO-27. Did it work? There’s one way to find out…

Want to see where baby antennas are made? This is the spot.

Stop by for a quick tour of my electronics workbench, the simple tools I use, and how I organize my junk, then join us on Temporarily Offline’s stream to chat about our workbenches.

What better way to take my new (to me) mountain bike out for its maiden voyage than to do a SOTA activation? I packed up the MTR3B, telescopic pole, and water and food for the morning, and set out for Middle Peak (W6/SC-024) in Cuyamaca Rancho State Park. It’s about 5 miles to the summit via fire roads, and plenty of trails in the area provide options for the descent.

The activation went great with plenty of contacts, and I even kept myself upright on the bike the whole trip up and back. Looking forward to the next one…

N1CLC, W6RWS, and I joined forces for an evening/nighttime activation of Palomar High-Point. 40m was on fire with contacts across the country, and 20m CW yielded a couple of nice DX contacts as well as a number of stateside QSOs.

We capped the evening with a little night photography before making the trek back down the hill.

But this time it wasn’t because I forgot my earbuds, AND I had sufficient coffee. Sometimes stuff just happens and you end up paying your hiking dues with no activation.

Johnnie and I set out to activate a couple of the highest peaks in Southern California, and escape the heat on Labor Day weekend. 2 nights in the backcountry were planned, and then… well, you’ll see.

We’ll be back…

Enjoy the show.

73 de K6ARK

Backpacking, family, fishing, and SOTA. What more do you need in life? Not much. And it’s all packed into this film about our recent 5 day adventure into the depths of the Northern Yosemite backcountry. Two SOTA activations, plenty of fish, and gorges scenery filled the trip. Hope you enjoy coming along for the ride.

Here’s a link to the video of the Live Stream activation… https://youtu.be/r19bNO2_g50.

73 de K6ARK

There are lots of ways to build links for Linked Dipoles, End Fed Halfwave antennas, etc. This is one of my favorites. Simple, robust, and easy to build.

Materials:
– 2.0mm Banana Plugs: https://amzn.to/31IIl7h
– Heat Shrink (w/adhesive): https://amzn.to/32FnNvA
– Super Glue: https://amzn.to/3lJdC1Q

Subscribe or check back in a month or two for an antenna build or two putting these links to use.

Alright, with the intro and outro, I admit – I took 37 seconds for this one. But it was worth it, wasn’t it?

73 de K6ARK

This is the one you’ve been waiting for – the traps to go with the micro End Fed Halfwave (EFHW) antenna build. Here’s how to make them.

These traps will work with my Ultimate Ultralight EFHW (https://youtu.be/s-_LyhdGapM) or just about any QRP end-fed halfwave antenna, and you could even build pairs to use with a dipole.

LINKS:
– LC Resonance Calculator: https://www.omnicalculator.com/physics/resonant-frequency-LC
– Toroid Winding Calculator: http://www.66pacific.com/calculators/toroid-coil-winding-calculator.aspx

You’ll certainly need some MATERIALS:
– T37-2 Toroids (my usual): https://amzn.to/3hFsYlj
– T50-2 Toroids (a little more efficient and maybe easier to build): https://amzn.to/2QCkGio
– 28 ga Magnet Wire: https://amzn.to/3b9Isf4
– 39pF 100v Ceramic Capacitor (0603 case recommended): https://www.digikey.com/product-detail/en/kemet/C0603C390J1GACAUTO/399-15862-1-ND/7516362
– 62pF 100v Ceramic Capacitor (0603 case recommended): https://www.digikey.com/product-detail/en/kemet/C0603C620J1GAC7867/399-14992-1-ND/7382541
NOTE: Consider a few other capacitors in the 22pF – 100pF range, depending on the traps you’d like to build.
– Perforated Prototype Board: https://amzn.to/2YLsFOJ
– 5/8″ Heat Shrink Tubing: https://amzn.to/3lwwGjt
– 1/4″ Heat Shrink Tubing: https://amzn.to/2G9bGzk

And you’ll need some TOOLS:
– Dremel (or similar)high-speed rotary tool: https://amzn.to/3gFEkEL
NOTE: I have had my Dremel tool for about 25 years now and it hasn’t missed a beat. Based on my personal experience, I would recommend going with the name brand tool.
– Diamond Cutting Wheels: https://amzn.to/2QBRHve
NOTE: I really like these because you can’t cut yourself with them, but they cut the perf board and BNC connector brass just fine.
– Soldering Iron (any will do) with a fine tip: https://amzn.to/2GaENlN
NOTE: I’ve been using this one for about a year with no issues. The heat gun is AWESOME for hot air/solder paste construction. The iron works well for traditional soldering.
– Electronics Tweezer Set: https://amzn.to/2ENy00w

Please share your builds with me when you’re done, and tell us about how it works out for you in the comments below.

Thanks!
de K6ARK