Tag Archives: Mobile

Field Reports, Guest Posts, Mobile, News, Portable, POTA, Travel, Videos

2,112 miles as AI7LK in the US Pacific Northwest

January 7, 2024 Vince VE6LK 17 Comments

by Vince (VE6LK/AI7LK)

As always there are links within the article. Click one! Click them all! Learn all the things!

In December of 2023, I found myself with a surplus of vacation from my employers, and my Brother who’s move-in date to his new home got suddenly moved forward to just before Christmas. I was able to get time off work and make an epic road trip with POTA stops along the way to both allow me to have some radio fun and to give my body a stretching break. My trip would take me from my home in Alberta, westward through British Columbia, southward into Idaho, Washington, Oregon and I even made it as far as Northern California to see the Pacific before turning around and heading back home.

Along the way, I activated at 14 stops which totaled 21 parks in all after factoring in the 2-fer, 4-fer and 5-fer stops! This was a total of 301 actual QSOs netting 508 after the x-fers were computed in. It was a mix of CW and voice with an average of 21 contacts per stop.

There were many highlights of the trip, and naturally spending time with my brother and his wife were at the top of the list–despite the work of moving into a house–followed by the simply spectacular scenery along the route and the route planning itself. While this trip was decided upon on a Thursday evening and I was on the road the following Monday, I still found about 10 hours to research points of interest along my routes and look for POTA entities that had either not been activated yet or were CW ATNO, having only had a Phone or Digital activation previously. For the most part, these were the stops I targeted as my waypoints.

The Columbia River is nearly a mile wide at Rooster Rock SP

Driving along the Columbia River Gorge on I-84 approaching Rooster Rock State Park felt like driving along the base of the Grand Canyon, given the 1000′ height of the cliffs beside me. Rooster Rock State Park (K-2850), is notable for two reasons. 1 – it’s a 5-fer activation point – my first 5-fer stop ever doing POTA, and 2 – it’s windy as heck as you can see in this short video I took for Charlie W7RTA who told me, via Discord, it would blow [what’s left of my hair] off my head.

Click here for 7 seconds of the Columbia River Gorge wind whipping the hair off my head!

Certainly Rooster Rock was a highlight given it’s the only 5-fer activation I’ve ever done. It was activated two hours after a 4-fer at Willow Creek State Fish and Wildlife Area (K-10646). I only learned about the multiples after chatting with folks on the POTA Discord server.

It was a short drive from Rooster Rock SP to the home of KJ6VU in Oregon City, Oregon. While I’ve worked with George on the Ham Radio Workbench Podcast for nearly three years, I’d never met him in person until this trip. It was such a treat to spend time with him. George is the creator of the Packtenna that so many of us love to use. As luck would have it, the KJ6VU repeater was due for a replacement and scheduled for the next morning, and I was able to put my skills in racking (installing) repeaters to good use. After we finished the repeater I departed and did some performance testing while southbound on I-5 to test its range.

The repeater crew. L to R: Josh K6OSH, Nick KF7SOM, the Author, and George KJ6VU

Along the way I got to have a coffee break with Nick Smith NT3S who I had met via Discord. Nick can be found activating parks and going overlanding on weekends. Thanks Nick for the time to have a break with you!

Over the next several days I spent time in Grants Pass Oregon assisting my brother and his wife to get moved in. Grants Pass even has a Harbor Freight Tools and I was able to get some shopping done! So as it turns out I wouldn’t be slugging boxes every day and there was a bit of a break during my visit to go out and play radio. I know the POTA program is especially popular in the United States and I’d heard that every entity has been activated at least once, which is very different from here in Canada where many parks are untouched. In my research and thanks to the parks added in the autumn of 2023, there are some in the system that had never been activated. On one Saturday afternoon I was able to visit one of these parks -Cathedral Hills Trail System- and work 72 contacts in under an hour on SSB.

Cathedral Hills Trail System, Grants Pass Oregon

Tall trees at Cathedral Hills Trail System, Grants Pass Oregon

On the following Tuesday, I headed out from Grants Pass to head to California if only to tick off the box on POTA’s website saying I’d activated there. I had no idea that Highway 199 would be so scenic. I activated six entities on this day.

At the end of Highway 199 is Tolowa Dunes State Park (K-1202). The photo at the top of this article is on the dunes and at the coast of the Pacific Ocean near Crescent City CA. Yes, I walked along the surf despite the threatening weather. It also allowed me the luxury to park within the dunes themselves to do my activation with a spectacular view. Continue reading 2,112 miles as AI7LK in the US Pacific Northwest →

Digital Modes, Guest Posts, How To, Mobile, News, POTA, QRP

K9JP: POTA QRV in a Ford Transit Connect!

January 7, 2024 Thomas Witherspoon 11 Comments

Many thanks to Jeff (K9JP) who shares the following guest post:

Simple-for-me POTA activations

Jeff (K9JP)

This past year, I discovered POTA and the joy of activating parks. This part of amateur radio is very rewarding to me. I started activating parks in March, which means cold and possibly snowy days. I took the easy way and set up my POTA station inside of my car with the engine running to power the radio and the car heater creating warmth, but increasing my carbon footprint.

I soon recognized that had to be a better way.

I was using a magnetic-mounted ham-stick type of antenna on the roof of my car to make the antenna easy to use. I had problems getting my ham-stick antennas to resonate, did a little web research, and found that I needed to bond the coax feedline to the body of the car. I made up a pass-through coax connection using a chassis mount connector and a short length of one-inch ground braid that I had in my spare parts stash. I attached the braid to one of the back set floor bolts

Now the antenna was resonating and working well. For my radio, I used my backup ICOM IC-7300 with a power output set to 4 watts for QRP Fun. I can use all bands from 20 through 6 meters now.

My next change was to purchase a rechargeable LiFePo4 battery.. Looking at the cost per amp hours, I decided on a 100 Ah battery that offered a possible 2000 charge cycles. It should last for years with good care. With the large capacity of that battery, I can power the 7300 for many hours at QRP power levels and operate either FT8/FT4 or CW, and would also make high power possible if needed for some reason or other operating event. My experience so far has been I can operate from five parks per day and only need to charge the battery after the fourth day or about 20 activations.

I have recently purchased a Ford Transit Connect minivan to convert for my POTA Park mobile adventures. The van offered a better way to mount the antennas I use. It has a roof rack with cross-bars.

I modified an older Diamond roof rack mount to fit the wider cross bars.

Once I installed the coax bonding strap under the center-row seat I was ready to go.

I had also received a 40-meter ham-stick type antenna and thought I would give that band a go on my next park activation. Again no joy, I could not get the 40-meter antenna to resonate. When I got back home, I made up a 1/2″ grounding braid strap long enough to bond or connect the roof rack mount to the body of the minivan. I covered this strap with dual wall adhesive lined heat shrink tubing.

This bonding strap is connected to the roof rack mount, runs under the side door weather stripping, and is terminated under the side door latch.

Now the 40-meter resonator was working very well.

How could I add 60, 80, or 160-meter bands? Giving that some thought, could I try to create a sort of 1/2 fan dipole? Yes, I could! Through experimentation, I made up clamp-on elements for 60, 80, and 160-meter bands. Those can be attached or clamped on the quick disconnects I have on all my ham stick antennas.

I support the clamp-on elements by either draping the wire element over nearby shrubs or small trees or by just using a plastic step-on fencing post that I found at my local farm and home supply store. It only costs $3.00. These elements create an NVIS radiation pattern which helps reach out to interstate POTA hunters.

Inside the minivan, I place my portable LiFePo4 battery, 7300 radio, and my laptop for digital modes and logging.

I hope you will find this helpful. I believe this is a simple way to activate parks.

I now have 186 activations, from 23 parks, and 4800 contacts using 160 through 6-meter bands. Many thanks to all I have contacted this past year and my goal for 2024 is to try and activate more Michigan, Ohio, and South West Canada parks using QRP power levels.

72/73 de Jeff K9JP

Antennas, Articles, How To, Mobile, News

Dave sorts out vehicle-mounted antenna SWR issues

December 3, 2022 Thomas Witherspoon 9 Comments

Many thanks to Dave (K1SWL) who writes:

Comments on vehicle-mounted antennas

by Dave Benson (K1SWL)

As with Rand’s recent post about his effective vehicle setup, I and others also use a small operating table inside the vehicle. I’ve tried a number of approaches to antennas. Without elaborating on those schemes, I’ll note that winter is now closing in here in NH. As a result, I’m now operating exclusively from my truck. My interest is now in minimizing setup and tear-down times. Barry (WD4MSM)

also commented about the improvement in vehicle-mounted antennas with an added ground. I’d like to quantify that.

I’d recently ordered a number of Hustler Mobile antenna components. They’re used as a stationary-portable setup using that company’s high-quality mag-mount. As I first evaluated the antenna, I was disappointed to find the minimum SWRs to be on the high side.

These results were related to the ‘floating’ coax shield, which serves as a counterpoise with the mag-mount setup. Worse yet, these results were inconsistent. Touching the coax connector shell at the antenna analyzer caused the SWR to jump up, as did just changing the way I held the analyzer. Bad juju! It means RF inside the vehicle, with the potential for RF-‘hot’ symptoms at the rig.. Adding a 1:1 balun inline eliminated the stray RF at the rig, but didn’t do much for the SWR. It’s also just one more gadget to bring along.

A better fix was a custom bracket that bolted to the truck frame. I first confirmed that there was low-resistance continuity between a target location and the vehicle’s cigarette lighter shell. This was something of a ‘comedy of errors’. I had a sheet-metal angle bracket on hand and went to work enlarging a hole in it. This had the usual outcome: a drill bit grabbed the workpiece and spun it. The bracket itself was buckled beyond redemption and my finger’s now healing well. A length of 1-1/2 inch aluminum angle bracket was just the ticket. Note that the mounting hole needs to be offset from the coax fitting mount. This avoids an interference between the mounting bolt and coax connector shell. Ask me how I know. The bracket assembly uses a specialty coax fitting from DX Engineering. It’s their part number DXE-UHF-FDFB.

This bracket is bolted down on one of the corners of the Tacoma’s passenger seat assemblies. It’s the closest location to the antenna I found without drilling holes and cutting the coax. For this vehicle, it’s a 10mm bolt and was paint-coated for appearance reasons. I replaced it with a stainless-steel bolt from a hardware store. It’s important to include a split-lockwasher between the bolt and the bracket. This’ll keep the conductivity to the frame good over time. The bracket is deburred and its corners rounded to preclude injury to passengers.

In any event, it’s out of the way of the seat’s legroom space. A 3-foot coax cable assembly brings the coax nicely up behind the rig atop the operating surface.

So- how’d it work? It’s like the difference between night and day! The broad SWR curves vanished – replaced by typical characteristics for monoband antennas. The sensitivity to handling the coax has vanished. (A representative curve at right.) The curves are narrower, and that’s actually a good sign- it means that unwanted resistances have been reduced.

With this fix in place, here are the SWR minima:

Frequency SWR

14060 1.04:1

21060 1.05:1

28060 1.16:1

I took advantage of the CQ Worldwide CW Contest this past weekend. I was able to work 101 stations on 10M, 15M and 20M with this setup. That was from a State Park 5 minutes away. The attraction was a large and sunny parking lot, and solar gain was such that I needed to leave the truck door open several times. This area is kept plowed out in winter, and I may try for the POTA ‘kilo’ award from there at the 1000-contact benchmark.