Category Archives: Guest Posts

Field Reports, Guest Posts, Portable, QRP

Park and Castle activation at the medieval Helfenstein castle

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by Thomas (DM1TBE)

The last weekend was too rainy to operate outdoors. So I welcomed the public holiday on Thursday, which allowed me to take a day off on Friday and have four days off. We call such days “Bridge Day” in Germany, they “bridge” a public holiday to the weekend.

Some time ago, I have suggested a new protected area to the WWFF, the World Wide Flora and Fauna program. The nature reserve Eybtal covers an area of over 1331 hectares / 3300 acres and is the largest nature reserve in the Stuttgart administrative district. The nature reserve is on the edge of the Swabian Alb, and the ruins of the medieval castle Helfenstein are well within the WWFF activation zone.

The Helfenstein Castle is a historic fortress can be traced back to around 1100 AD when it was constructed as a strategic stronghold to protect the surrounding territories.

Coat of Arms

During the 13th and 14th century it was the seat of the Earls of Helfenstein. After a lost battle in 1372 things went south and in 1396 the family of Helfenstein had to sell a large part of its territory, including its family seat.

The new owners expanded the castle into a formidable fortress. They extended the castle walls to include a fortified tower and a second ring of walls.

Around the year 1400, a tower was built on the nearby rock. It served as a lookout and was intended to prevent the castle from being cannon-fired from that location.

During the Second Margrave War in the 16th century, Helfenstein Castle was besieged and heavily damaged. It was subsequently abandoned and fell into ruins.  In the 19th century, there was a renewed interest in medieval architecture, and efforts were made to preserve and restore Helfenstein Castle. The ruins were partially reconstructed, and today, visitors can explore the restored sections. Continue reading Park and Castle activation at the medieval Helfenstein castle →

Accessories, Articles, Guest Posts, News

Guest Post: EmComm and FunComm!

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Many thanks to Scott (KK4Z) who shares the following post from his blog KK4Z.com:

EmComm and FunComm

by Scott (KK4Z)

As I have said earlier, I practice EmComm to prepare for natural or man-made disasters when normal means of communication fail. FunComm is pretty self-explanatory, it’s things I do for fun. Fun things may include POTA, Field Days (winter and summer), supporting bike rides, and other club activities. I always like it when I can blend the two together. When I participate in POTA either for a weekend camp-out or a day activation, isn’t it kind of a practice run for an EmComm event? I use the same antennas and most of the time the same radios. My equipment gets a good exercise and I learn more about how they operate under different conditions.

Recently, I bought a new camper, the old one wasn’t working well for the things I like to do. The new camper is so much better but not without its growing pains. I had to find a better way to use the radios inside the camper. To save words, here is a picture of what I have been using. It works okay but because it uses part of the bed, it made sleeping uncomfortable. After this last camp out when I woke up all sore and twisted feeling, I decided it was time to find a better way.

The new desk stacks the radio and power supply above the computer. This reduces the overhang on the mattress. The desk area for the paddle does overhang a little but sliding the desk to the right when not in use alleviates that.

The other thing I did was make a cut-out on the door side to make it easier to get my legs out. This works really well and does not impair the stability of the desk.

The last thing is the main desk is 30″ deep and the shelf is 20″ deep. This leaves plenty of room for the radios and enough room to slide the computer under the shelf if I need the desk space for something else.

Sitting behind the desk, the radio controls were easy to get to.

The desk is made from one sheet of 3/4″ plywood with (2) 1×3″x8″ boards. The stain was a can of Minwax I had laying around, I think it was Golden Oak.

Construction was simple, using hand tools found in most garages. It is not a piece of art, I don’t have the time. My philosophy is that “Perfection is the enemy of good enough”. The desk is glued, screwed, and nailed without any fancy joinery. If I waited until I had time to do a better job, the wood would still be at Lowe s.

I tried it out in the driveway and everything works and feels good. The radio is easy to get to and the computer is a little high but not uncomfortable. With the cut-out, it is easy to get in and out of the camper. The next test will be at the end of the month during my next camping trip. Hope to hear you out there. 73 – Scott

Field Reports, Guest Posts, News, Portable, POTA, QRP, QRP Radios, SOTA

A Triple activation and why I switched from a KX3 to Icom’s IC-705

25 Comments

by Thomas (DM1TBE)

Intro

The last weekend was pretty nice and just like an invitation to operate outdoors. As I wrote in one of my previous posts, I often activate summits on the Swabian Alp, a high plateau, which falls with steep cliff-like edges and many SOTA summits to the northwest. If you approach it from the foothills where I live, the sharp edge is clearly visible.

On the way to the ascent, you came along old, picturesque villages. If you look closely, you can see the “Maibaum”.

The tradition of erecting a “Maibaum” (Maypole) is a long-standing custom in Germany, particularly in the southern regions. The Maibaum is a tall wooden pole that is decorated with colorful ribbons, wreaths, and symbols of the local community. It is usually erected on May Day or the night before and is a symbol of spring, fertility, and community spirit. In some regions, it is also accompanied by folk dances, music, and festivities.

It was my third activation of the summit Römerstein, and every time I used another transceiver.

My transceiver history

When I started with ham radio, I used an old Icom IC-706.

The lack of modern features such as DSP and filters, and the current consumption made it not the first choice for portable operators. I soon switched to an Icom IC-7300 at home and got used to a waterfall and spectrum display.  After two activations with the 706 I bought a Xiegu G90.

During the time of my first activation of the Römerstein, I operated only in SSB. So, I was happy with the G90. The display was small, but way better than my old 706. I was satisfied and used the G90 until I started with CW. In CW, I prefer using headphones until today. The sound of the G90 was uncomfortable for me. The lowest volume was too loud, a lot of loud cracks annoyed me, and I was never happy with the filters. Continue reading A Triple activation and why I switched from a KX3 to Icom’s IC-705 →

Articles, Field Reports, Guest Posts, POTA, QRP, SOTA

Getting To France With Detours: A SOTA/POTA/WWFF Triple Activation

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by Thomas (DM1TBE)

As I have written in my activation report for Klínovec, a summit in the Czech Republic, I am trying to activate places outside my home region DM, Germany – Low Mountains in SOTA or DA in POTA. With the May 1st being a public holiday, the long weekend provided a perfect opportunity for an activation a bit further away.

After a while looking around, I chose Brissetish Kopf (FL/VO-126) in France. The summit was close to the German border, hasn’t received much love with only 8 SOTA activations and was also a POTA spot for F-1697 Vosges du Nord Regional Park and WWFF Parc Regional des Vosges du Nord, FFF-0035. That promised enough QSOs for me and provided chances for chasers.

The small cluster to which the arrow points are the Vosges, actually the northern Vosges (Vosges du Nord). The cluster south of it are the higher part of the Vosges. The Vosges are a range of low mountains in Eastern France, which continues as Palatinate Forest on the German side of the border, with the highest summit being 1,424 m / 4,672 ft.

I started my journey quite early, leaving around 8am. During the drive I could not help but had to tease Thomas (K4SWL), who spent quite some time in France and, as far as I know, enjoyed it.

The French region Alsace, through which I had to drive to the Vosges, is quite interesting. The region was disputed over several hundred years between Germany and France and changed back and forth between the two. Many place names are still German, or sometimes a mix of French and German. After the World War II, the region returned to France – hopefully the last change.

I used Google Maps to drive to a parking place close to the summit, but my first attempt ended here:

Not sure why Google meant to show me this – thanks for the 30 minutes detour.

Roughly a half hour later, I arrived at Climbach, the small village next to the summit. Based on findings, the area is populated since the Middle Stone Age, that ranged from 280,000 to 25,000 years ago.

Continue reading Getting To France With Detours: A SOTA/POTA/WWFF Triple Activation →

Articles, Field Reports, Guest Posts, QRP, SOTA

Two SOTA activations in the Swabian Alb – And a broken JPC-7 antenna

5 Comments

by Thomas (DM1TBE)

Intro

I live very close to the Swabian Alb (also known as Swabian Jura or Schwäbische Alb in German). The Swabian Alb is a mountain range in German region Swabia. It ranges from Bavaria in the northeast 200 km / 140 mi to the Swiss border in the southwest.

Thomas Römer, CC BY-SA 3.0, via Wikimedia Commons

The Swabian Alb is a high plateau, which falls slowly to the southeast but with steep cliff-like edges to the northwest. You can follow the northwest edge of the Swabian Alb by looking at the map of the SOTA summits at sotl.as.

The topology limits the possibilities to cross the Swabian Alb, so the course of the routes are more or less unchanged since thousands of years. I live close to an old Roman road. And where an important road was, there isn’t a castle too far away, since the medieval noblemen were quite keen to get its share from passing people and goods.

During the Cold War, important passes received mechanisms to place explosive charges. In case of an advance of the Soviets and its allies, it was planned to blow these roads up, as there was usually no alternative way around.

First Activation: Plettenberg

The Plettenberg (DM/BW-046) is a summit at the edge of the mentioned Swabian Alb, about halfway between Stuttgart and the Swiss border. It’s 1002 m / 3287 ft tall and has a quarry on top.

The quarry uses a ropeway…..

… to transport the stones to the plant.

The way from the parking place to the activation zone was rather short with 300 m /  1000 ft. Continue reading Two SOTA activations in the Swabian Alb – And a broken JPC-7 antenna →

Antennas, Articles, Guest Posts, News, QRP

Dale uses WSPR to test counterpoise orientation

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The CHA MPAS Lite

Many thanks to Dale (N3HXZ) who shares the following guest post:

Does your antenna counterpoise orientation matter?

by Dale (N3HXZ)

I am an avid SOTA and POTA activator and love field operation. I use a portable vertical whip antenna with a single counterpoise for my antenna system and have always wondered if orienting my counterpoise would provide some signal strength gain in a particular direction.  I decided to run a series of tests using WSPR to gather field data, and use statistics to answer the question:

Does one counterpoise orientation favor another in terms of average signal strength?

WSPR is a great tool for antenna testing. You can study various antenna configurations by making some WSPR transmissions and then checking the data on the WSPRnet database to see how well the signal was received at various stations located all over the world. You have to be careful in interpreting WSPR data though as receiving stations have different antenna and radio configurations, and the band propagation can vary rapidly at times. So how do you take advantage of all the data you receive from stations and draw some meaningful conclusions? I have found that using proven statistical theory in analyzing the transmitted signal strength received from individual stations can provide you results that you can confidently trust.

So what statistical algorithm is helpful?

For antenna signal strength comparison between two configurations, you can use an independent two-sample t-test with a one-tailed t-test evaluation. It sounds like a mouth-full, but it is quite simple. For our purposes, the t-test compares the average signal strength at a given receiving station from two different antenna configurations. The one-tailed test validates or invalidates the hypothesis that one antenna configuration produces an average signal strength greater or less than the other antenna configuration.

The testing requires that you run WSPR long enough to gather multiple reports at a single receiving station for both antenna configurations. Using the signal strength reports, you compute the average signal strength and the standard deviation of the signal strength over the sampled data points. Excel can easily provide that data.  With this information and the number of sample points for each antenna configuration (they can be different), you then run a calculation by hand or in Excel to compute the ‘t’ value.

This ‘t’ value is then compared to a critical value for the number of sampling points from a ‘Students t table”. If the ‘t’ value is less than the critical value you can confidently conclude that the hypothesis is false and therefore conclude that there is no significant difference in the mean value of the signal strengths between the two.  If the ‘t’ value is greater than the critical value you can accept the hypotheses that one antenna configuration produces a greater or less average signal strength than the other configuration. Continue reading Dale uses WSPR to test counterpoise orientation →

Accessories, Articles, Guest Posts, Portable, Reviews

Coax cables I used for SOTA/POTA – A horror story

31 Comments

by Thomas (DM1TBE)

I think every portable operator thinks about their coax cables and how to use more light and flexible types. During the last few activations, I have switched from my rigid Aircell 5 to the lightweight and flexible RG316. I have bought a couple of different lengths, mainly from Chinese online sellers at AliExpress.

However, I had some hard to define issues like the vague feeling that I am not getting out as good as I should, or a changing SWR during an activation. So I thought I should check my cables before looking at other parts of my equipment.

My professional and educational background does not have anything to do with electronics, and I don’t have the equipment to measure the cable loss directly. But my goal was to check if the cables were faulty, not to measure the exact attenuation.

I have an SWR and Power meter from DJ9PK as per image below. It can measure PEP and has, according to the seller, an accuracy of +/-4 percent.   You can find more details about it here in German or here in English (Google / auto translated).

My KX3 with a CW paddle served as signal source. As large differences are easier to spot than smaller, I switched to the 10-meter band as the HF band with the highest attenuation.

I then measured a short cable with a very low loss, a 1 m / 3.3 ft RG213, which should have an attenuation of less than 0.1dB (excluding plugs).

I simply checked how much power came out at the other end of the cable. That value I have used as reference. This cable (and all others) was plugged directly between the KX3 and the power meter, no ATU involved anywhere. The power meter was set to measure PEP. Continue reading Coax cables I used for SOTA/POTA – A horror story →

Articles, Field Reports, Guest Posts, QRP, SOTA

SOTA in the Czech Republic – When everything goes wrong

6 Comments

by Thomas (DM1TBE)

As I have mentioned in my two previous posts, I have visited my family on the other side of Germany. On the way back, I wanted to make a “tiny detour” and activate a summit in the Czech Republic. I like all kinds of numbers and statistics, and that includes my SOTA stats. My goal is not being number one or be in the top region somewhere, but seeing it progressing and developing satisfies me. Until July last year, the upper right pie chart was only light blue, i.e. I had only activated summits in region DM, Germany – Low Mountains. So I use every chance to push the light blue back.

sotl.as

After some concessions, my family agreed and the way back increased from 6 hours and 583 km / 362 mi to 8:30 hours and 732 km / 455 mi.

Route on Google Maps

On the drive to visit my family, I noticed that I forgot my wallet, so I had neither an ID card nor my driving license. In many regions of the world, it would be probably very difficult to cross an international border two times without papers. However, many countries in Europe have signed the so-called Schengen-Treaty, which led to the creation of Europe’s Schengen Area.

Camoka4, CC BY-SA 3.0, via Wikimedia Commons

The Schengen Area consists of 27 European countries with a population of over 400 million, who have abolished border checks. However, random inspections still happen. The worst case would be a control in the Czech Republic and the official requirement to go to the German embassy in Prague for new papers.
As expected, the border crossing was easy and it could easily been overseen.

If you missed that sign in the photo, you only note that the town names have changed to Czech, as Czech names are quite different. After the border crossing, the summit is just minutes away, and you can drive up to the very top – pretty convenient for a 10+3 points summit.

Derived from User:Rdc, Public domain, via Wikimedia Commons

The summit Klínovec (OK/KA-001), also known as Keilberg, is the highest mountain in the Ore Mountains, located on the border between the Czech Republic and Germany. With a peak reaching 1,244 me / 4,081 ft above sea level, Klínovec has been a popular destination for outdoor enthusiasts and tourists, and is the most important winter sports area in the region. The mountain has a rich history that includes mining activities for silver, lead, and tin in the dating back to 2500 BC, and it has evolved into a popular skiing and hiking destination in recent years, attracting visitors from both countries. According to reports, the peak has attracted people for hundreds of years, with the earliest observation tower erected in 1817. Continue reading SOTA in the Czech Republic – When everything goes wrong →

Digital Modes, Field Reports, Guest Posts, News, POTA, QRP

N2YCH’s “Fly-Away Kit” QRP POTA Activation

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Many thanks to Conrad (N2YCH) who shares the following field report:

“Fly-Away Kit” QRP POTA Activation

by Conrad Trautmann, N2YCH

4/15/2023

The National Association of Broadcasters convention is an annual event that takes place every April at the Las Vegas Convention Center in Las Vegas, Nevada. This year, I traveled to the show for work and made some time to activate a park and get another state ticked off my “Activated US States” list. I also didn’t want to miss getting the Spring 2023 Support Your Parks Weekend activator award.

A colleague suggested I visit Red Rock Canyon National Conservation Area, K-7494. The park, which is operated by the US Bureau of Land Management, has a 13 mile scenic drive that has various parking areas you can stop at to get out and explore. Red Rock requires a reservation to visit and costs $20 to enter the scenic drive area. There are places within the park you could activate for free, but I took advantage of my military veteran benefit of free admission and drove the trail and activated at one of the scenic overlooks.

Before I traveled, I had to decide what radio and antenna to bring. I selected the Elecraft KX3 and the AX-1 antenna. Not having to check a bag was key to deciding what to take.

I packed the cables, battery and computer in my brief case and the radio and the AX-1 antenna went into my carry-on bag. I did get pulled out of line by the TSA at JFK airport, but the TSA agent was very nice and just asked a few questions and let me through with no issues.

Before I traveled, I took a look at the park page on the pota.app website and saw that Colin, AK7LV, was the park leader in QSO’s. I looked him up on qrz.com and sent an email asking if he had any good advice for me or could give me some pointers. He responded quickly with suggestions of his favorite locations, how to get to them and even a suggested location where I could pick up a twofer at a trail that crossed through the park. He said I should call him when I get into town. Continue reading N2YCH’s “Fly-Away Kit” QRP POTA Activation →

Accessories, Guest Posts, How To, Mobile, News

Scott builds a mobile desk for HF park-roving

8 Comments

Many thanks to Scott (KK4Z) who shares the following post from his blog KK4Z.com:

Necessity is the mother of invention

by Scott (KK4Z)

Plato’s Republic he said that *our need will be the real creator* or the proverb as we know it today *necessity is the mother of invention*.  Recently, my friend Thomas K4SWL acquired a Yaesu FT-891.  During his YouTube video, he expounded on how much fun he had with it. It did indeed look like fun. During this time I was pondering about doing more day activations instead of overnights.  With the cost of everything still climbing, the need to conserve becomes apparent.  I thought an FT-891 might really be a great radio for these day activations. Then reality set in.

I already have a number of projects I am working on and misc things like maybe having to replace my old 33′ push-up pole, it was not in the stars nor was there a twinkle in my wife’s eye when I mentioned it. In reality, the IC-7300 is a great radio and does everything I need to do especially in the field. I don’t need another radio, I have three 100 watt radios and three QRP radios. I still wanted an easy setup for these one-day activations. I want to drive to a park, set up in a few minutes, operate, tear-down in a couple of minutes, and head for home or another park. I also wanted to make my day activations park ranger friendly. To me, that means trying to be inconspicuous.

I have two projects planned. The first is a desk for my truck. I am making a desk to sit over the center console and front passenger seat big enough to hold my IC-7300, a laptop and a CW paddle. My plan is to secure the desk to the truck and the radio to the desk. I also wanted to make this as cheaply as possible. I used stuff I had on the property such as a half sheet of plywood and some construction lumber. The only things I had to buy were some screws and eye-bolts, about 14 dollars worth.


The plywood was cut to 24 x 38.5 inches. The length covers the center console and front seat while still allowing me to get to the heat/AC controls. I gave the corners a generous radius and I broke the edges with a router. On the underside, I used a 2 x 12 to make a spacer for the center console where the cup holder is and a leg for the other side over the passenger seat. The spacer is glued and screwed to the desktop but the leg is not attached. This is to make it easier to store. I made a socket for the leg using 2 x 2’s. It’s probably easier to look at a picture than me to try to explain. I added eye rings to the rear of the desk and use a bungee cord to secure the desk to the passenger seat. The only other thing I did, sprayed the top with polyurethane. Note. I am not a carpenter or cabinet maker. I use rough hand tools to get the job done and I am often making do with what’s on hand or what’s the cheapest way to do it.

Continue reading Scott builds a mobile desk for HF park-roving →