2022-05-30 I participated in the CQ WPX CW contest
Last weekend was the CQ World Wide WPX Contest CW organized by CQ Amateur Radio magazine. The term 'WPX' stands for 'Worked All Prefixes'. The objective of this contest is to get contacts and exchange information with as many different other radio amateurs using morse code. Points are awarded for each contact, based on which amateur band and whether they are in the same or different continents. Multipliers are calculated from the number of different prefixes contacted. The prefix of my callsign PE4KH is PE4 which is a different prefix from for example PE3. This is a 48-hour contest. A good reason for me to participate was to practise my morse in contesting skills. Those skills still need work as I had trouble understanding the serial numbers. But with a bit of asking for a retransmission or guessing from the previous/next serial it sort of worked out for me. I felt like I had a lot more trouble understanding the serial numbers compared to a week ago in the King of Spain CW contest. I guess my call PE4KH is now in the list(s) of regular contest calls. When my callsign is repeated completely, it's never a PE4KS. In morse, an H is four dots .... and an S is three dots .... In the first few contests I had to correct PE4KS a few times, or ended in the log with the wrong call, so this feels to me like my call is now more familiair. I got 102 contacts in the log. I operated Saturday afternoon and parts of the evening, and late Sunday evening, wrapped around things like sleeping and other things in the weekend. I got one new country in the log: Mongolia. And I made my first morse contacts to Japan, China and Malta. The score table:Band 160 80 40 20 15 10 QSO's 0 0 31 71 0 0 Pts: 144 Mul: 84 Score: 12096
2022-05-23 I participated in the King of Spain CW contest
Since I have been learning morse code and passed the morse exam I notice I get more enjoyment out of contacts in morse code than out of contacts in digital modes. In digital modes (FT8) it is the computer doing hard work decoding and there isn't much variation, in morse I do the decoding and contacts can be from very simple confirmations of callsigns to longer chats about things. This also means I like chances to make morse contacts. One of the simple ways to make more morse contacts is to get involved in an amateur radio contest with morse. Last weekend was the His Majesty The King of Spain CW Contest and I participated. Before the contest I tried to build a contest scoring file for TLF Linux contest software. During the contest I found out the file wasn't correct as the score wasn't calculated correctly but I will debug that later. I participated Saturday evening and I made 41 contacts: 37 on the 20 meter band, 3 on the 10 meter band and 1 on the 40 meter band. That's 41 in total, which is not a lot: the minimum number to get a digital certificate in PDF format is 50 or 100 contacts. But I'm not doing this to win anything, I'm doing this to get more experience in morse and morse contesting. I still have trouble decoding morse at 'contest speed' so I use a morse decoder on the computer. There are moments it's a lot better at decoding a callsign at speed than I am, but sometimes I decode a serial number better than the computer does. This also mean I do all of this in 'search and pounce' mode, where I look for stations calling CQ TEST at a signal quality where I can decode the callsign with help from the computer, and I can hear whether they get my callsign correctly.Read the rest of I participated in the King of Spain CW contest
2022-05-18 A nice 10 meter opening to Italy, getting more WRTC stations in the log
Today when I had time to use the radio I noticed the 10 meter band was open. I had some nice contacts and saw II3WRTC on 10 meter FT8 and made the contact. II3WRTC is one of the WRTC 2022 Award stations and before today I had a lot of those in the log but none on the 10 meter band. I changed this quickly with II3WRTC on 10 meter SSB too, II9WRTC on 10 meter CW and II3WRTC on 10 meter RTTY.
2022-05-12 Generations of Netgear switches and interface names
In my time at Utrecht University computer science I wrote a script to search Cisco switches for a given ethernet address and respond with the port. This could be used to trace things on the network, which helped on incidents in progress. This script was based on the typical things Cisco switches do with vlan CAM table lookups and the best implementation. CAM stands for Content Addressable Memory: memory optimized for doing lookups by certain content. In the case of a network switch a 6-byte MAC address plus 2-byte vlan id will be used to do a lookup of the 2-byte interface number where it was last seen, and this lookup is done in hardware. This CAM table is accessible via SNMP, and the funny part is the MAC address for the lookup is also encoded as SNMP identifier. I could get the whole CAM table via snmpwalk but as I only want to lookup 1 MAC address it is way faster to go directly from MAC address to interface number. After that the interface number is translated to an interface name and that name is usually something recognizable to a network engineer. When I started using managed switches at home from Netgear I adapted the script at home and enhanced it for Netgear switches. I recently added a third netgear switch when upgrading the fiber to the shed and I updated the script to learn about the new switch. I noticed the interface names are quite different over the generations of netgear switches. The oldest switch is a Netgear GSM7224. The interface name from a query is "Unit: 1 Slot: 0 Port: 15 Gigabit - Level". The second switch is a Netgear GS716Tv2. The interface name from a query is "Slot: 0 Port: 11 Gigabit - Level". The newest switch is a Netgear GS310TP. The interface name from a query is "GigabitEthernet9". The Unit: 1 in the GSM7224 suggests some option for stacking multiple switches, but I can't find any mention of that option in the on-line documentation. The other fun part I notice is interface names never showing the fact that they are actually an SFP interface with an SFP in them. The port status for a port with an SFP is not different from the status for a copper cable at gigabit.
2022-05-11 The fiber to the shed network has been upgraded
I got around to doing the upgrade of the fiber to the shed network I had on my mind today. A friendly network layer 1 engineer had some leftover Cisco SFP modules and the netgear GS310TP and netgear GS716Tv2 switches accepted these without any issue. So the layer 1 network link came up fine. The layer 2 link with vlan support took me a few hours, somehow I managed to get confused with vlan tagging, vlan tagged only frames and the primary vlan id. I haven't done this in a while and I sort of copied the configuration from another port which may be less than optimal too. I had to run through the house a number of times to get the configuration right, wireless devices can't access the managed switches. At least I got the whole configuration working in the end. I think I can add other vlans to the link too (I want the option of a wireless access-point in the shed). Putting the switch, the power supply for the switch, the raspberry Pi, the power injector for the 1-wire measurement network and all network cables and fiber in the plastic box I bought for this work was a bit of work, it just fits (so a wireless access point will have to live outside that box..). But it's all in there and the box is closed again. It's just not airtight anymore with the new holes for power, fiber, network cable, gps antenna cable and 1-wire network. I may need to stuff the holes with foam or something similar to keep insects from crawling into the box. Everything works now and the measurements from the solar inverter are coming in!
2022-05-09 Grafana alerts working again
After reverting to Grafana 8.4.7 for a while because alerts were failing in Grafana 8.5.0 I had a look at the available version today and saw version 8.5.2. I assumed the problem with DataSourceNoData errors was fixed by now and did the upgrade. Indeed the alerts are seeing data fine now and I trust they will work when needed.
2022-05-08 Trip to Iceland day 15
Our flight was leaving Keflavik International airport at 07:40 so we wanted to walk through the door of the airport at 05:40 and return our car before that time. So the alarm went of at 05:00 and we put everything in the car and drove to the airport rental return area. Hertz has a huge parking area for returning rental cars so we parked in that area and walked to the return office. The office was still closed so we dropped the key in the key return box and walked to the main airport building. There we used a luggage cart and went to the check-in for our flight back home. The check-in was a bit of waiting but nothing really bad. After check-in it was time to go through the security check and even with a bit of extra checking of our luggage we were past that point fast. We found ourselves in the main waiting area for departing flights with lots of time to spare, so we finally had time to eat some breakfast and get an extra fresh juice. The flight back was fine, I decided to watch the film 'Rush Hour' from the entertainment system. Back in the Netherlands temperatures were higher again! We took the train from Schiphol airport back to our house.
2022-05-07 Trip to Iceland day 14
After breakfast we left the apartments and walked towards the center of the city and the main shopping street. Most of the shops were still closed in the morning. We changed plans a bit and visited the Reykjavík Park and Zoo which was more of a botanic garden. We tried to hop on a bus to get there but that was the first time we actually needed cash money. Trying to get the app for the Reykjavik bus working with a Dutch credit card also did not work. So we had to get actual money from an ATM to pay for bus trips. My wife and son went swimming for a while and we went back to the city center, now open. We walked along Laugavegur, which is the main street of Reykjavik. We also visited the Hallgrimskirkja which is a magnificent church building. Several signs were there to remind the tourists that it was also a house of worship. For an early dinner we found a nice pizza restaurant on Laugavegur. After dinner we returned to Keflavik. We had arranged another night at the Nupan de Luxe hotel. We set an early alarm because of our flight back the next day. We also packed our bags again with being on an airplane in mind, or rather going through the security check. It was also time to make sure the fuel tank of our rental car was filled completely before returning it the next morning.
2022-05-06 Trip to Iceland day 13
We woke up in Eldhestar hotel and had breakfast. My wife and son had booked a horse ride for the afternoon, so we had some hours before that started and visited Hveragerði. The area around Hveragerði has had several serious earthquakes. The library and shops building had an exhibition on the 2008 earthquake with pictures and stories from eyewitnesses. The building that this is all in has a scary detail of its own: during construction a huge crack in the earth was found right between the foundations. The decision was made to not build the 4 floor tower nearby and adapt the building to deal with earthquakes. Still the 2008 earthquake caused damage. To the north-east of Hveragerði is an area with lots of geothermal activity which can be hiked easily. We also visited the geothermal park inside Hveragerði. According to the descriptions some parts of this park have changed as a result of that 2008 earthquake. In the afternoon was the horse ride. My son and wife had a great time with very easygoing Icelandic horses. I decided to drive to the coast and have a look there. It turned out this was a non-tourist area so the coast was just some harbour areas and industrial fish handling. After all that it was a relatively short drive to Reykjavik. We wanted to visit the city the day after so we drove to our place to stay. We went from driving on the 2-lane ring road near Hveragerði to huge highways near Reykjavik. But with only 1 serious correction we managed to find our apartment: Stay Apartments Bolholt where we made dinner and went to bed somewhat early.
2022-05-05 Trip to Iceland day 12Items with tag english before 2022-05-05
We left from Lækjaborgir Guesthouse and started driving along the ring road again. We stopped in Vik for a visit to the local souvenir shop. When we visited Vik in 2006 it was very rainy and cold so we were looking for warm gloves. The gloves were found in a small shop. Between 2006 and 2022 this small shop was replaced by a huge store with all kinds of Iceland souvenirs. And they still had gloves, but we had brought our own. Along the coast were some great views. The erosion of lava rocks is very interesting. We stopped at Skógafoss Waterfall which is so high the last 50 meters before the fall you're already walking in a big spray. There is a path to climb to the top but we decided against it as it's quite high up. We stopped at the Lava centre in the afternoon. The Lava centre has exhibitions around the very active volcanoes on Iceland including reports on the 'famous' Eyjafjallajökull eruption in 2010. Outside of Iceland it mainly made the news for causing massive disruption to air travel because of the ash that was in the air which made flying impossible. The Lava centre had the Iceland side of the experience which was with disruptions everywhere due to ash falling down all over, and people who looked out the window to see if the rumbling volcano had changed and seeing the first explosive eruptions. The Lava centre has a lot of explanations on how volcanic eruptions work and how certain influences can change them completely. And it turned out the person behind the cash register in the entrance also had extensive knowledge of volcanoes so we chatted with them about our views. The Lava centre also has an observation deck where you can see a few of the big volcanoes of Iceland in the distance. But due to rain and thick clouds there was nothing interesting visible. In the afternoon we continued our drive and ended up at Eldhestar hotel. Yes we visited that hotel before. We wanted to get back there so my wife and son could go horseback riding the next day. The Eldhestar hotel is close to the city of Hveragerði so we drove over there for a nice dinner and an evening walk.