15M – W7MTB: Amateur Radio Notes

Activation Report: W7O/CE-188 – Lava Butte, OR | January 2023

Lava Butte Summit

For the February Polar Bear / FYOB combined event, Tim N7KOM, and I wanted to get out and do another joint activation. Since we both had limited time a quick approach summit would give us the best opportunity to make the most of the day so we choose to return to Lava Butte. We activate Lava Butte together back in April of 2022 on our first meeting and outing. He documented the adventure in this youtube video.

Tim picked me up and we drove the short 10 minutes from my house to the base of the butte, pulling off US 97 just at the base of the access road, saving us about 1/4 mile of walking on pavement. We made quick work of the 1.2M paved walk to the top. Upon arrival at the summit we decided that I would take up a working position on the deck of the fire lookout, while Tim setup his station at the base of the lookout. He would setup his K6ARK EFHW in an inverted L configuration, whilst I setup my same antenna in Inverted V, but first we did a quick 2M call on 146.58 and each had our required 4 contacts in less than 10 minutes.

N7KOM Working 2M FM

We decided that I would start on 10M and he on 40M working around each other in case of interference. 10 and 15 meters were both ripe with contacts as soon as I spotted myself. I wanted to do the entire activation CW but being a bit rusty, I turned my WPM down to 13. Having only worked 10M voice and never worked 15M in the field, I was surprised by who I was hearing. NC, AL, ME, TN, MS and one VK5 station… that’s Australia!!! Needless to say it was a busy 45 minutes on the higher bands. I attempted to work 17M but with Tim on 20, there was enough interference that I decided to jump down to 40M and work the locals. I worked an S2S with WU7H, WW7D and got N7LFO plus a couple of Canadian stations.

W7MTB Working 15M Pileup

Tim brought a small cup of Sake along to take the bite out of the cold. While it was 43 F, there was a brisk breeze out of the SE, and it was hitting me directly on the side as I had to change my position when I extended my wire to 40M. I could tell I was getting brain fried after an hour of operating and decided it was time to call QRT, drink the sake and begin tearing down.

ICOM IC-705 and Sake, the Japanese know what’s Up

Tim was in the middle of a huge pileup so I took shelter behind the lookout to let him work through the herd. He wanted to work S2S with WU7H and WW7D on 30m but had to wait for their pileups to cool down first. Once he got them both in the log he packed his Elecraft KX2, K6ARK paddles and EFHW up and we trotted down the hill for an after action beer and burger at The Brown Owl in what is now called the Box Factory plaza in the Old Mill of Bend.

Tim, N7KOM, working 20M Pileup

Later, after a nap and some down time with our doggos, I tallied my day: 4 2M FM, 5, 10M CW, 7 15M CW and 7 40M CW, for a total of 23 contacts; not too bad for a guy who spent the past six weeks studying for the Extra exam, not practicing copying CW.

Alternate Winter Parking

Lava Butte is an easy walk up in just about any season. It can be accessed via US 97 S, about 4 miles south of Bend, OR. There is a parking lot that is usually open all winter but unmaintained. Optionally, there is a pull out on the side of the highway I’ve circled on the map avoe.

Penntek TR-35 4 Band CW Transceiver – First Transceiver Build

WA3RNC Penntek TR-35 4 Band, 5 Watt Transceiver

One of the things that drew me to amateur radio is the kit building aspect. Only weeks into the hobby, and before I had my hands on an HF rig I was ordering parts for an End fed random wire build I found on the AARL site. The first build went well but I haven’t been very impressed with the performance from the QTH. Since it’s a random wire antenna, it requires a tuner in the field, which I don’t have with me normally so it hasn’t seen much use.

I’ve built a couple of other antennas since with the K6ARK EFHW being my favorite but I wanted to up the challenge. I love the Icom IC-705 but its a bit heavy for SOTA Ops so I decided I wanted to build something smaller. I’ve been learning CW so I shopped for a really small, simple CW only kit. I looked at several packages and settled on the QCX Mini from QRPLabs. I ordered the package with the aluminum case and ACG module at a total of $84 before shipping, seemed like a good deal except for the 2 month wait.

Not long after I ordered the first radio I saw a video from Thomas, K4SWL, on the Penntek TR-35. I had looked at the radio previously but thought it a lot of money for a CW only radio that didn’t have any memory. One thing I love about my IC-705 is that is has 10 recorded memories for both voice and CW, which is almost a requirement for calling CQ lest one get a hand cramp in the field. Everything else about the radio looked fantastic, 4-Band, 5 Watt transceiver in a nice plastic case to reduce weight. There are a lot of features packed into this little radio and you can even have it assembled by pro’s at the factory if building isn’t your thing. WA3RNC continually adds to the software and the latest update includes two memory channels that Thomas demonstrated during and activation and I was sold. I ordered a kit before finishing the video and it arrived in less that a week.

The kits is really, really well put together. The instructions are very clear and verbose. The parts are packed in sealed strips, with each step’s parts in a separate little “bubble”, so as long as you only open the current steps parts and complete that step prior to opening the next, you will never loose parts. I found this very, very helpful as this was the most complex kit I have assembled to date.

The instructions are broken into four discrete parts:

READ ME FIRST
TR-35 Upper Board Assembly Instructions
TR-35 Lower Board Assembly Instructions
TR-35 Preliminary Checks, Tests and Final Assembly

Also included are a schematic and Operating Guide.

This being a rather expensive kit, $279 USD, I didn’t want to screw anything up soI read through the entire assembly instructions and highlighted things that seemed important or would be easily missed. This is something I learned after a couple failed builds due to missing a detail because I misread or was in a hurry… doh!

The entire build took me ~ 5 hours, though that was spread out across a couple of weeks as I had a trip and lots of work to do during that time. Usually when I build a kit I want to sit down and complete it start to finish so I don’t loose anything but as I mentioned previously, the way this is packaged made it easy to complete a step when I had 10-15 minutes of free time over the course of the build. Since the toroids are pre-wound, it is mostly a soldering build. Having a good quality, heat controlled iron, good solder (Kester 60/40 lead) and flux (not a requirement) and side clippers are a must. The only other tool I used was my multimeter during initial testing.

Once completed, I let it set for a few days so as not to rush the testing. I re-read the Preliminary Checks guide and made a checklist of each of the tests so I didn’t miss anything. Testing took me an hour or so, other than having to wait for new fuses for my Multimeter’s ampere testing circuit so I could do the Final RF amplifier bias adjustment. Everything checked out, so I decided to power it on and make the final adjustments before testing it on the air. With those final steps completed and the final assembly of the case, knobs, buttons, switch covers done, I hooked it up to the 20 M dipole I have on the roof and listened. I was astonished that it worked and I managed to not screw anything up.

I’ve now had it out in the field a couple of times and used it in the backyard several times and am very impressed. My only gripe right now is that the output volume of the keyer and the overall output are linked, so when listening to faint signals I have to remember to turn the volume down before I key lest I blow out my eardrums. This may be something I can adjust but I haven’t investigated yet. I have made a couple of contacts on 20M and intend to do several SOTA activations in my neighborhood in the near future as well as build the QCX Mini and do a comparison.

K6ARK End Fed Half Wave (EFHW) build and test

I watched a video on the Ham Radio Crash Course about this very tiny and relatively easy-to-build antenna a few months ago and bought one right away from Amazon. It only took about 30 minutes start to finish, the hardest part being attaching the surface mount capacitor as the video describes. I have since use it pretty much exclusively when activating the in the field. I even had a SOTA SSB QSO with Adam, K6ARK, himself during a SOTA activation at Smith Rock State Park!

I am using 18 gauge wire cut for 20M. I used my NanoVNA to tune and marked 10-20M on the wire with various colors of shrink wrap to differentiate the bands. I have a second length of wire that I added banana clips to connect so I can get up to 40M if I want to. If I want to use a new band I unroll from the Buddipole wire holder to the marking and check the SWR function on the IC-705 in the field and so far have had pretty good success. I’ve done several POTA and SOTA activations using SSB with the antenna. I love how simple and portable this setup is.

This is a great DIY antenna project, it simple to build and easy to use and I’d suggest it for anyone interested in field QRP activating.

K6ARK End Fed Half Wave QRP antenna with wire on Buddipole winder