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Day 13 – Nevlungshavn – Langesund – Kragerø – Stabbestad – Øysang

Monday, July 7th. I slept very well in the shelter and did my routine before leaving at 9am. The weather was very good for cycling (overcast, 17-18 °C). The shelter place was a bit hidden in a forest, so it took me about 15 minutes to get back on the route.

Pushing the bike back to the Route 1

I cycled towards Eidanger near Porsgrunn and continued to Langesund. At this point, the roads revealed their true Norwegian face (as expected): endless hills with forests and massive rocks. My bike is a bit too heavy due to carrying food, water and some unnecessary stuff. So this little  inconvenience forced me many times to push the bike uphill while the descend was super nice with max. speeds over 55 km/h! There were also some masive construction sites on the roads, very impressive stuff!

The route between Langesund and my next destination point in Kragerø was very difficult. There was a 3 km track with steep hills in combination with bad gravel road in a forest which forced me to push the bike 80% of the time. Past the forest part, roads were better but did not lack hills 😅

It took me 5 hours to cycle 40 km of this kind of terrain. In Kragerø I took the ferry to Stabbestad and continued cycling to Øysang, a small village near my destination city of Risør. This part was about 13 km and took me 1.5 hours.

According to my plan, in Øysang should have been another ferry which should take me to Risør. Upon my arrival in the harbor, everything went south: the ferry was closed for this day and it just started raining for the next 5 hours. The next ferry would leave at 10:45am on Tuesday, which is too late for me.

Øysang ferry schedule, “Fra Øysang” means “From Øysang [to Risør]”

After standing some time in the rain and not knowing what to do next, I found a small covered stop with a bench – just to escape the rain. I decided to stay there for the next couple of hours and get some rest and try to move early in the morning. I might skip the Risør ferry and get ahead in schedule if I circumvent the bay. I would return back to Route 1 in Tvedestrand, about 30 km away from Risør.

Øysang ferry, closed for this day
My “shelter” for this night…god damnit, not again 😩
Pissing weather at night

The heat treatment of my bike computer with pocket oven worked very well! No more reboots.

108.15 km, 9h5m, 11.9 km/h, max speed 56.6 km/h

Sigma Male speed levels were reached on that day

Day 13 – Nevlungshavn – Langesund – Kragerø – Stabbestad – Øysang Read More »

Day 12 – Åsgardstrand – Tønsberg – Sandefjord – Larvik – Nevlungshavn

Sunday, July 6th. I had a good sleep and the tent got dry again. I had to change the brake pads due to terrain for the past 1000 km or so. The weather was very nice on this day: sunshine, 21 °C and little to no wind. The roads were great but also full of hills – had to push my bike quite few times uphill.

Serviving the bike, exchanging of the brake pads

I’ve visited Tønsberg and Sandefjord, both very nice places.

A Reeperbahn in Tønsberg!
Steep hill – again….
Awesome fountain in Sandefjord, it shows fishermen at whaling

My bike computer showed some life signs during sunshine (heats up, releases some moisture) but it was still rebooting intermittenly. I will try to dry it with a pocket oven. The pocket oven is filled with Zippo lighter gasoline and the gasoline is burnt slowly by a catalyst material over few hours. It releases enough heat to keep things like hands warm at cozy 40-50 °C.

Moisture inside of bike computer
Pocket oven used for drying 😅

Today’s shelter was hidden near Nevlungshaven. Amazing place near a bay where one could take a bath. I really liked this place and after having a dinner, I went to swim a bit. Perfect ending for a long day.

Tonight’s shelter
Place few meters away from the shelter
Panorama view of the bay

~90 km today, 12-13 km/h

Day 12 – Åsgardstrand – Tønsberg – Sandefjord – Larvik – Nevlungshavn Read More »

Day 11 – Oslo – Asker – Drammen – Sande – Horten – Åsgardstrand

The day started at 6am with some low-intensity rain which built up steadily. I packed my stuff inside of the tent and prepared myself for the rainy weather. As soon as I stepped outside, my rain clothes were fine and dealt with rain very well. However, the tent got wet and I had no  chance to pack it in a dry place. I left the camp site at 9am and had to navigate to the cycling route while it was raining. Luckily it was mostly cycling downhill so I was able to be on route in about 30 min without difficulties.

My tent (Hilleberg Unna) has an antechamber where I can store my bags in case of raining weather conditions

The next 4 hours were “OK” for cycling – heavy rain but no wind and not to steep terrain. I couldn’t take photos becsuse everything would get wet in few seconds. At a certain point I was wet outside due to rain and also wet inside due to sweat. That’s no problem as long one stays warm. My feet are my weak point 😅 Once they are soaked and cold – game over. But luckily not this time.

Stopped here for a break and tried (unsuccessfully) to clean my tent
A park in the city of Drammen where I set up and cleaned the tent

I visited the city of Drammen where I was able to set up the wet tent in a park and remove the water as best as possible. This is extremely important on bike tours – wet tents can be a showstopper. The moisture needs to be removed, otherwise the tent will get “moldy” 2-3 days later. Sleeping in a wet tent is also very uncomfortable. Every time you encounter this situation, stop at a dry place (under a bridge for example) and clean the tent.

The journey on Route 1 continued until it “ended” abrupt near Kjeldås. My way to the city of  Horten was mostly via country roads and I had to use smartphone navigation a lot. The weather got better by the evening and I reached Horten without problems.

Incoming ferry from Moss in Horten
Back on Route 1

I cycled about 12 km more to a hidden shelter just outside Åsgardstrand. It was located inside of a forest. The shelter place had a hut where I could stay alone for a night. I set up the tent once again, dried it and slept inside (to fend off pesky mosquitoes).

Shelter in a forest few kilometers outside of Åsgardstrand
No bears attacked me (yet) 😅

My bike computer got wet and it stopped working. Probably some moisture got inside and messed up the electronics. It keeps “rebooting” so no accurate kilometer estimate is possible right now. RIP

Bike computer didn’t survive the rain and keeps rebooting

I cycled around 100 km according to the map measuring tool.

Day 11 – Oslo – Asker – Drammen – Sande – Horten – Åsgardstrand Read More »

Day 10 – Oslo

Friday, July 4th. Free day to hang out in Oslo. Weather was superb – sunshine, some 20ish °C, mild breeze. After leaving the camping place and swearing never to visit them again*, I looked for a quiet place in a park to choose some few places to visit. I was carrying a lot of stuff with me so climbing the hills of Oslo was not an option.

View on Oslo from Ekeberg

I’ve visited the central station, the opera house, the city hall, the parliament, the cathedral, the Royal Palace and the German embassy. Along the route, I’ve seen the harbor where ships commute between Oslo and Kiel.

Oslo S
Naked people all over the place
Bike posing in front of the Royal Palace

In the evening, I thought I’d give another camping site a try. After driving up the hills for 30 minutes, I arrived at another Top Camp site in Oslo. Oh, the horrors – not again… Anyways, paid 50 EUR and I was shocked by the construction site I saw behind the entrance 😅 Luckily, everything was fine: quiet place, well maintained service house – no problems whatsoever. They were very kind to charge my batteries over night.

Construction site behind the entrance of the camping site

I talked to nearby campers about my journey and they gave me some useful advices for my future travels to eastern/northern Norway! Great day with some rainy clouds on the horizon. 

Not many kilometers today… 24.9 km, 7.8 km/h (mostly walking through the city and climbing the hills)

Day 10 – Oslo Read More »

Day 9 – Elingård – Tomb – Moss – Vestby – Oslo

Thursday, July 3rd. Day started with pissing rain at 16 °C. I felt no hurry to rush things and had some coffee and snacks. The sleep in the shelter was excellent besides mosquitoes waking me up during the night.

“Morning chaos”

The tour started a bit late at 10:30am. It was raining on and off for an hour but the weather got better by noon. The first 10 km on the roads were nice and quiet until I approached larger cities where traffic noise dominated the background noise.

Some “gems” picked up along the way. I like this

Reaching Moss was pretty much straight-forward, however, I got slowed down significantly by construction sites spread over multiple towns. Some parts of the route were closed, so finding alternative routes cost me some additional time getting back on route. Navigating through cities in a zig-zag manner was hell. I lost the way many times and finding back on route was very time-consuming.

One of the construction sites
Yep… My mindset on this day

Anyways, at a certain point I ignored everything around me and just wanted to get to Oslo as fast as possible in order to escape the “Göteborg fiasco” as described few days ago…

I approached Oslo around 8pm. I had a view from the hills descending towards Ljan. The evening sun was shining and it was beautiful. Every 100 meters I had to take new pictures because more details appeared.

View on Oslo

The descend showed some issues with Oslo: lots of traffic, little parking space, many private properties, small sidewalks (barely enough space for a pedestrian). I visited the central station Oslo S prior to moving to a camping site in Ekeberg.

There we are! Oslo Sentralstasion

I decided to stay at Top Camp in Ekeberg. The price tag was high for a cyclist with tent: I paid 600 NOK for one night stay (approx. 50 EUR) which is almost double the price from Swedish camps. The quality of the camp site service house was disappointing: jammed toilet doors, clogged drain, prepaid card charging machine out of service. I couldn’t charge up my batteries. However, the tent area was large and spacy and the views on the cityline from the hill were awesome. I would not camp there again except in an emergency case like this.

View from Ekeberg at Oslo Central. Very nice
Noctilucent clouds during night time

I will stay tomorrow (Friday) in Oslo and do some sightseeing. I don’t like the traffic and high price tags. Staying there will deciminate my travel budget very quickly. Therefore, moving on by evening may be a possible conclusion of my short visit…

100.2 km, 7h57m, average speed 12.58 km/h, 42.91 km/h max.

Day 9 – Elingård – Tomb – Moss – Vestby – Oslo Read More »

Day 8 – Ørje – Halden – Fredrikstad – Elingård

Wednesday, July 2nd. Woke up early in the morning to get some extra kilometers done. I was 10-15 km too short according to my plans. I was on the road quickly and the weather was OK for cycling: 18 °C overcast, no wind, a bit of rain clouds.

The cycle route was mostly on the regular road. The car drivers in Sweden and Norway were very nice so far and really friendly! I had no trouble and felt always safe on the roads. Thank you car drivers!

Typical road on this day, weather was fine

The route was challenging but I had to walk rarely due to steep hills. The walks were short, just few tens of meters to maybe 300 meters. I could maintain a good speed and progressed without large dificulties. I listened to music to mitigate the loud sounds of bypassing traffic and to get some variety.

Entering Halden kommune

I reached Halden by noon and continued to Isebakke, just 3 km away from Swedish border. At this place, my old friend “Route 1” – The North Sea Cycling Route. From there, I continued cycling to Fredrikstad.

Sign pointing to Amundsen’s birthplace
Amundsen’s birthplace near Fredrikstad
Roald Amundsen statue in Fredrikstad

On my was to Fredrikstad I was close to the birthplace of Roald Amundsen, the famous Norwegian Explorer who reached the South Pole some 100 years ago. In Fredrikstad I took the ferry over the river and kept cycling 15 more kilometers. I found a very nice shelter near Elingård along the Route 1. Very unique and exciting day. Will hopefully reach Oslo tomorrow!

Shelter near Elingård

126.3 km, 9h10m, avg 13.78 km/h, max speed 51.84 km/h 😎

Need For Speed 😎

Day 8 – Ørje – Halden – Fredrikstad – Elingård Read More »

Day 7 – Bengtsfors – Lennartsfors – Töcksfors (S) – Ørje (N)

Tuesday, July 1st. After camping at Bengtsfors and charging up my batteries, the day started with sunshine and awesome weather forecast. I left the camp at 9:30am. The landscape changed to more forest and hills. My cycling route was mostly on the asphalt roads, which were great. 

Nice weather and roads in Sweden

Cycling was challenging going uphill but I had to pull the bike just a couple of times. The gear range was sufficient for most hills. Racing downhill was the most fun part: fresh wind and high-speed feeling. This “up and down” repeated for the next 70 km or so until 11 km prior to Töcksfors.

I kept following the Route 4 but the terrain changed suddenly to gravel/forest walkpaths and steep terrain. The roads were rather made for mountainbikers than for regular travel bikes. I had to push my bike a lot and the mosquitoes started to bite me 😅

Walking this way instead of cycling

At some point and struggling ~1.5  hours, I reached Töcksfors. The morale was low so I had to eat something. I shopped some food before moving on to the border, which was only few kilometers away.

Gravel road near the border, me pushing my  bike

Everything went well until some 2 km prior to the border. The route changed from regular road to the well-known steep forest gravel thingy. So I had to literally push my bike and hike to the border.

At this point, it was just annoying. Will I ever be able to ride my bike again? After 45 minutes of pushing uphill, I finally reached the Swedish/Nirwegian border. It was very rewarding and I was proud of achieving this.

Finally there! Swedish / Norwegian border

After walking a bit out of the forest and returning back to the regular roads, I cycled downhill to the next place called Ørje. I found a small camping spot at a local parking lot/rest area with toilets and set up my tent. There was another guy from France who also set up his tent. We talked a bit and got ready to get some sleep. The french guy told me he was hich-hiking from France to anywhere he wants and has already been in Vietnam… I was mind-blown by his story, bonne voyage!

“Emergency camping” in Ørje 😅

99.8 km, 8h19m, average speed 11.98 km/h, 51.7 km/h max.

Day 7 – Bengtsfors – Lennartsfors – Töcksfors (S) – Ørje (N) Read More »

Day 6 – Vänersborg – Mellerud – Bengtsfors

It’s already Monday! 😅 I had a great night at the camping site. It was calm and no noise from pesky humans. After check-out at 9:30am, I headed north-east along the western coastline of Vänern.

The weather was very nice for cycling: sunshine with little wind and no clouds with temperatures ranging from 19…25 °C. I’ve visited the lighthouse close to Jakobsbyn and it was really beautiful there. The cycle route No. 6 continued towards Mellerud, a small nearby town.

The lightshouse near Jakobsbyn
One last view before leaving Vänern

I had to take a longer break in Mellerud because I got tired really bad. Coffee and chocolate bars from a local gas station revived me again for the 2nd half of the tour towards Bengtsfors.

I cycled few kilometers with a cyclist from France, but the conversation was a bit difficult because of the surrounding noises (cars, wind) and language-specific accent. We parted our ways some 30ish km before Bengtsfors.

The route to Bengtsfors was simply beautiful. Lake on one side, forest on the other side of the road. Hills were steep and there were first signs of challenging terrain. The regional communities put a lot of effort to make this tourist region attractive…

Cycking along Lelång Lake

Anyways, I’ve been able to pursue my daily goals and reached a local camping grounds in Bengtsfors at 8pm. It has a lot of space and it’s located directly at the lake Lelång.

116.25 km, 7h47m, 14.93 km/h, 42.45 km/h max.

Day 6 – Vänersborg – Mellerud – Bengtsfors Read More »

Day 5 – Göteborg – Trollhättan – Vänersborg

Sunday. My motivation got much better after eating up all the chocolate bars I had in storage. I cycled slowly some 10 km until I reached the Göteborg Central Station. I successfully finished the Kattengattleden from Malmö to Göteborg in 3 days, which was a huge motivator and also initial test (fitness, camping equipment).

Göteborg harbor
Very impressive bridge in Göteborg
Kattegattleden completed! Success!

Unfortunately I realized that my planning had a flaw: there was no “Route 28” as suggested by OpenCycleMap and my waypoints didn’t match the town names on the direction signs. What a bummer! The backup plan was to use my smartphone to navigate – which increased the battery consumption significantly.

Nevertheless, I left Göteborg quickly and moved on. There wasn’t much to see on a Sunday morning around 5am (except the drunk party folks). Göteborg rather looked like a huge construction site than a city 😅 The toilet at the central station was out of order and I went to the gas station instead.

After a long phone call with mom, I stopped at a nearby gas station, bought a coffe and fuel and tried to dry my wet tent. There was enough sunshine and wind to blow it dry in like 20-30 minutes. This works great on asphalt since it absorbs some radiation from the sun and heats up the ground.

Drying my tent

I continued the bike ride at 11am and something amazing happened: for the next 70 km (!) or approx. 5 hours of riding time, I had a strong back wind which made the hills look like a piece of cake. I would have never thought this could happen. The back wind pushed my average speed up and I could reach Trollhättan and Venersborg between 4 pm and 6 pm respectively. The weather was perfect for cycling and the camping site at Vänern lake was amazing (except the price… 400 SEK or 35 EUR for one person with bike and tent). Unfortunatelly, the water was a bit too cold for my taste on this day 😅

This “TROLLYWOOD” imitation if the famous  Hollywood sign in Trollhättan gave me a laughter!
Vänern seen from the bridge…
…and from the camping site

110.1 km, 8h34m, 12.85 km/h

Day 5 – Göteborg – Trollhättan – Vänersborg Read More »

Day 4 – Björkäng – Grimeton – Varberg – Kungsbacka – Göteborg

Saturday started with heavy wind and rain. I packed the wet tent and started cycling around 9:30am towards Varberg and ultimately to Grimeton. One of my goals of this journey was to visit the Grimeton Radio Station, the home of the Alexanderson Long Wave Transmitter – SAQ. Bad weather couldn’t stop me! I was there and saw the huge antennas, the transmission lines, the booth and some little extras. Unfortunatelly, I lost a lot of time for sightseeing and photographs but as always: #worthit. SAQ will transmit on July 2nd and celebrate its 100th birthday!

My short visit at the Grimeton Radio Station
In background: The huge antenna towers of the Alexanderson Transmitter

I continued the bike tour and visited the cities of Varberg (12 km) and Kungsbacka (50+ km after Varberg). In Kungsbacka, there was a huge Pride Parade and after randomly ordering a hamburger, I met a cyclist from Austria who was trying to cycle to Nordkapp! He had to cancel his travel to Nordkapp due to a bike defect with his spokes. We had a 20 minute chat about cycling, very nice guy.

Kungsbacka celebrating the Pride Day

Cycling to Göteborg took much more time than expected. Even with shortcuts to save some time and favoring weather conditions, I was still some 15 km away from the city and wasn’t able to find any camping grounds. The clock showed 22:30 hours and I had troubles reaching the daily goal. This of course ended in a bad situation for me… didn’t find a stay over night and camping inside or around Göteborg was virtually impossible. Had to sleep on a bench. Awful!

Noctilucent clouds over Göteborg

I did get maybe 2 hours of sleep, I was freezing, everything hurt after a long cycling day and it took a lot of effort to stay motivated.

Cycled till midnight: 132.5 km, 9h17m, 14.25 km/h

Mucho kilometro but at what cost?! 😅

Day 4 – Björkäng – Grimeton – Varberg – Kungsbacka – Göteborg Read More »

Day 3 – Laxvik – Halmstad – Falkenberg – Björkäng

The previous night was rainy/windy. Luckily, as I woke up, the rain stopped and it was just windy. I packed my stuff and was en route a bit late at 9:30 am.

15 km till Halmstad
Sculpture in Halmstad

The rest of the day I was confronted with heavy headwinds. My average speed dropped from 16 km/h down to 13 km/h. Sounds not much but it’s significant. It usually means “double punishment”: cycle harder with less speed. I’ve visited Halmstad with quite some delay and cycled on towards Falkenberg. It was very exhausting but the weather got much better towards afternoon. The winds calmed down by evening hours around 6-7pm.

An unfinished “bridge” in Falkenberg

I couldn’t reach my daily goal Varberg, however, I camped in Björkäng, about 15 km away from Varberg. By luck, I met a wonderful traveller couple from Germany at the campsite in Björkäng who invited me for a coffee and travel-talk. They have been travelling in Sweden and Norway for the past 6 weeks by camping van and told me a lot about the special places they visited and I surely want to visit in the next couple of years. That was worth it… great experience!

A sun’s halo (rainbow patterns) spotted near Morup

Tomorrow I’ll continue my route to Varberg and head to Grimeton before finishing the Kattegatleden in Göteburg. Will try to keep 100 km/day as long as possible…

99.3 km, 7h30m, 13.3 km/h

Day 3 – Laxvik – Halmstad – Falkenberg – Björkäng Read More »

Day 2 – Brunnby – Ängelholm – Torekov – Båstad – Laxvik

Very nice cycling day. The weather was perfect for cycling. First 30 km were very easy to master, however I started slacking and lost some time with shopping and breaks. The landscapes were beautiful and very pleasing.

Ängelholm center

My daily goal was to reach Halmstad, however, the weather report showed some incoming rain. I decided to camp in Laxvik just before the rain set in. That seemed to be the right decision because shortly after setting up the tent, it started raining.

Taking a break and drying wet clothes

There was lot of rain with changing duration and intensity, followed by strong winds. I was very tired and just slept without caring much about the noise…

Camping site at Laxvik

108 km, 6h52m, 15.7 km/h

Day 2 – Brunnby – Ängelholm – Torekov – Båstad – Laxvik Read More »

Day 1 – Malmö – Landskrona – Helsingborg – Brunnby

My bike tour started today on Wednesday, 2025-06-25. I woke up early in the morning at 5:30, packed my stuff and  had some great breakfast. The Copenhagen Central Station was some 300 meters away. The ticket price from Copenhagen to Malmö was a bit cheaper (99 DKK for ticket and 50 DKK for bike ticket, ca. 20 EUR total) than the other way around.

Crossing the Øresund Bridge by train

The weather was mixed and windy at 18 °C. The first half of the day was windy and raining. Later during the afternoon, the weather got much better – lots of sunshine and no clouds. It was windy along the coastline, less windy towards main land.

Sydkustleden – Cycle Route No. 3

From Malmö C, I followed the route No. 3 – Sydkustleden to Helsingborg. I have visited cities of Landskrona and Helsingborg. In Helsingborg, the route was continued on Kattegatleden Cycle Route No. 1 to Göteborg.

Flying saucer in Landskrona
Cannons and WW2 bunker near the Citadel in Landskrona
Here we are in Helsingborg at the start of Kattegatleden Route No. 1 to Gothenburg
Helsingborg

I kept cycling until late in the evening until tiredness set in and I had to find a place to rest. After looking for a camp spot, I found a shelter few kilometers behind Brunnby where I slept over night. Great place, it was quiet and I really enjoyed it.

Shelter near Brunnby

Total distance: 123.7 km, Ride time: 8h40m, average: 14.3 km/h

Day 1 – Malmö – Landskrona – Helsingborg – Brunnby Read More »

Copenhagen

Staying today at Copenhagen to visit some places and to recharge batteries, resupply missing stuff etc.

I visited the Danish National Museum and spent there few hours and participated in a guided tour. It was very interesting learning about Viking and Danish culture, ranging from the 10th century till modern times. I liked the museum very much, well spent money.

The Danish National Museum

It’s funny how Vikings and – much later – the King of Denmark were “victims” 😅 of Metrology when it comes down to trade and economy. Typical trade goods back in those days were precious metals such as gold and silver or expensive spices (pepper, salt etc.). I couldn’t resist making some pictures of scales and their “weight standards”.

An ancient scales and some weight standards (small cubes/dices in front)
Length, volume and weight “standards”
Modern-day test equipment – an amperemeter from the early 20th century

After diving into history for 4.5 hours, I was finally looking for a fish restaurant but couldn’t find one which isn’t too expensive. I found one but prices for a menu were in the order of 40 EUR without drinks. Instead I decided to go to a grillhouse. The dish was very tasty but also pricy – almost 30 RUR for a grill menu. Usually it’s 20-ish EUR but eating in a shopping street proved to be very pricy.

BBQ at grillhouse

The weather didn’t recover much, temperatures were around 18 °C today with short periods of rain. I decided to return to the hostel and start preparations for the bike tour, which starts tomorrow. Unfortunatelly one of my roommates didn’t sound very healthy – he was coughing and stayed in the room presumeably the whole day. I hope he doesn’t give me a flu…

Not my bike, but it has much with the modern-day bikes in common…

Copenhagen Read More »

2025 Cycling tour in Scandinavian countries

This time I’m trying something new. I’m currently on vacation and I’m about on my way to ride my bike from Copenhagen, Denmark through Sweden to Bergen, Norway. I will try to write a travel blog on a daily basis via my smartphone through the next couple of weeks.

Basically, during past couple of days, I’ve been busy packing my stuff to travel via bike and tent. It took me three days to prepare everything (clean clothes and bike, repair equipment etc.). Packed the bags by sunday morning and hurried to the central train station.

vsf Fahrradmanufaktur TX-1200 packed

Catched the train on time and also arrived in Uelzen on time. However, the connection to Hamburg had a delay of approx. 40 min. Further delays forced me to change trains in Lüneburg in order to get to the city of Lübeck-Travemünde. I arrived about 1 hour late due to train delays but still had 3 hours left.

Arrival in Travemünde

I killed the time at the beach before moving to the harbor. The beach of Travemünde was crowded very well, temperature was around 27 °C.

Beach of Travemünde

At around 18:30h I moved to the port towards Skandinavienkiel. The check-in at the port was very easy and I met some nice cyclists along the way. We went together on board and had an exclusive place for our bikes in front of the ship (bow side).

Our bikes at the car deck

Departure was on time at 22h and the sights from the Observation/Sun Deck were amazing – the promenade, the beach and some lightning on the horizon!

Leaving Travemünde

The Finnlines personnel were friendly and very supportive, thanks alot to the crew!After having a dinner, I went to the cabin and passed out quickly due to a dense packed travel day. Awesome!

Diabetes-dinner 😅
My cabin

2025 Cycling tour in Scandinavian countries Read More »

Happy (late) new year 2025!

I’m a bit out of phase (2 weeks late) but it’s cold and dark outside, maybe I’ll write some blog articles soon(tm) 😅

There will be interesting stuff in 2025, namely electrometers, voltage references, more cycling adventures, ham radio stuff and… screws! Lots of screws…

Just a fistful of screws. I wonder where they belong …

Have a nice and wonderful year y’all!

73 de Denis, DH7DN

Happy (late) new year 2025! Read More »

Made in USSR – Microcircuit Type K573RF2

I have been very busy during the past 3 months. I’ve prepared some blog posts but had no time or motivation to finish and publish them. Usually my blog posts have several hundreds or thousands of words with images which can be very time consuming when compared to microblogging services such as Twitter/X or Instagram and Mastodon. I’ll try to keep it brief this time 🙂

The recent dumpster diving dropped off few pieces of Soviet technology: a type K573RF2 EPROM. In original Cyrillic script it’s written as Κ573ΡΦ2 confused as K573PO2 or K573P02.

Erasable Programmable Read-Only Memory (EPROM) retain data even after the power has been switched off. There is an interesting Wikipedia article on EPROMs which I’d like to refer to. EPROMs were used during the microcomputer era of 1970s and 1980s as non-volatile memory and have been replaced by modern memory types such as EEPROMs and Flash Memory. This particular integrated circuit (IC) from Soviet era is probably a clone of a 2716-type of EPROM which has been manufactured by Intel during the 1970s. The date code of this particular unit suggest a manufacturing date either in week or month 04 of the year 1985.

I tried to get a good shot of the integrated circuit which can be seen through the quartz window. Unfortunately, I don’t have a suitable microscope with the necessary magnification optics to resolve more details. EPROMs have a distinct fused quartz window which permits to shine ultraviolet light (UV) on the silicon chip. UV light exposure erases the programmed memory cells which can be re-programmed again. Well, can’t say much about it. You can see the bonding wires and the arrangement of the memory cells. One could trace the bonding wires to the pin out and reverse engineer it. The packaging is probably made of alumina and with gold plated pins – this may indicate a military version of this IC?

I’ve found a datasheet for K573RF2 (K573P2-2716) and tried to translate it K573P2-2716_en via Google Translate. Have fun!

vy 73, DH7DN

Made in USSR – Microcircuit Type K573RF2 Read More »

New Book on the Shelf – Tektronix Epic Oscilloscopes by Giovanni Becattini

New addition to the lab! I bought Giovanni’s book via Amazon because it’s really epic. You can find freely downloadable, high-quality ebooks on his website: http://www.k100.biz/e-Books.html

Tektronix Epic Oscilloscopes by Giovanni Becattini. An epic book!

Unfortunately, it’s a “niche-topic book” but every vintage Tektronix aficionado will appreciate it. As an owner of 400, 500, 2400, 7000 and 11000 Series Tektronix Oscilloscopes, this book is just a must-have. Well-spent 70 EUR!

Thank you Gianni, your books are truly well-written, informative, beautiful and inspiring.

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Visible aurorae all over Germany

Earth got hit by a Coronal Mass Ejection from our Sun’s activity region AR3664 yesterday. Polar lights were spectacularly visible in most parts of Germany. My friend Michael woke me up around 23:30 CEST (= 21:30 UT) and I immediately rushed to the outside. After taking few (bad) pictures with my smartphone, I moved back to my apartment and observed the natural spectacle from my balcony. We even saw the International Space Station passing over us – a very eventful evening.

Visible Aurorae in Braunschweig, photographed with Samsung Galaxy S22
Visible Aurorae in Braunschweig, photographed with Samsung Galaxy S22 (2024-05-10): Image taken from the nearby street heading to the north. Unfortunately the street lights show some lens reflections

The geomagnetic storm isn’t over yet, we might be able to observe further polar lights tonight! I’ll try to catch some photographs with my DSLR camera!

Visible Aurorae in Braunschweig, photographed with Samsung Galaxy S22
Visible Aurorae in Braunschweig, photographed with Samsung Galaxy S22 (2024-05-10): Image taken from my balcony heading to the west
Visible Aurorae in Braunschweig, photographed with Samsung Galaxy S22
Visible Aurorae in Braunschweig, photographed with Samsung Galaxy S22 (2024-05-10): Picture taken heading to the west

I will post more photos here.

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Höcherl & Hackl PL506 DC Electronic Load

I bought a Höcherl & Hackl PL506 DC electronic load just recently. It’s a nice piece of equipment to test switch-mode power supplies (SMPS) or any DC power sources like solar modules or batteries. I will need few of those for Tektronix SMPS repairs. As far as I can tell, DC electronic loads are rather rare and expensive units. So I grabbed one on an auction site for a very decent price compared to current offers (which is crazy, they ask 600…1000 EUR for such unit).

Höcherl & Hackl PL506 front panel.

Höcherl & Hackl PL506 back side.

After unboxing and shaking the unit, I noticed a strange noise. Since it’s easter holidays here in Germany, I thought it was some kind of a “Kinder Surprise Egg” time!

But no, I was disappointed. No easter eggs 🙁 It was the fan which broke off.  I looked for other damaged parts and defects but there were none. No signs of burned parts, bad electrolytic capacitors etc. Looking good inside!

Höcherl & Hackl PL506.

H&H PL506 – The unit was shipped like this. The rubber vibration isolators broke and the fan fell off.

The vibration isolators probably became brittle over the years and broke during the transport. The fan fell off and had to be reattached.  The front panel buttons are a bit crusty, too and will need to see a maintenance one day. The heat sink could need a clean-up, too. Build-up of dust and dirt diminishes heat transfer and can cause either performance issues or overheating of power dissipating MOSFETs.

Rubber dampener with metal thread insert.

I was looking for a suitable replacement in my electronics parts bins but found nothing. I used zip ties to reattach the fan to the heat sink. The unit was fixed in less than 10 minutes.

Problem was fixed with zip ties.

A quick test with a random 13.8 V SMPS was successful. I was able to load 19.9 A at ~13.4 V which corresponds to ~267 W output power of the SMPS. This DC electronic load is capable of dissipating 500 W continuously or up to 900 W short-time. This was a short-time test with 4 mm banana cables since I didn’t have proper high-current cables at hand.

Höcherl & Hackl PL506. Testing a 13.9 V / 20 A power supply.

Very nice addition to the lab. Hope this will be useful for future repair and maintenance projects!

 

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