dj5cw - Network

#TIL The @bsi (German Federal Office for Information Security) actively scans for open #Telnet servers and then sends notices to the network...

#TIL The @bsi (German Federal Office for Information Security) actively scans for open #Telnet servers and then sends notices to the network owner, which (in the case of my Hetzner VPS at least) are forwarded to the owners.
Of course, there are still legit use cases for telnet in 2025 (e.g. https://rbn.telegraphy.de/info#telnet). Still, my heart always skips a beat when a mail from abuse@hetzner.com arrives 🙂

The monthly CWops Solid Copy newsletter was just published. Always a good read for anyone interested in Morse code (CWops members or not)....

The monthly CWops Solid Copy newsletter was just published. Always a good read for anyone interested in Morse code (CWops members or not). In this issue, there's the story of how a couple of friends helped twenty year old blind ham Jenna, N4JEH to set up a station in her dorm room, so she can finally get on the air while studying away from her home (shack): https://cwops.org/current-month/ #morsecode #hamradio (Edit: Fixed link to current month's issue)

Some people spend a lot of time to do seemingly nonsensical things - and it's absolutely fine 🙂 #hamradio #morsecode #rbn...

Some people spend a lot of time to do seemingly nonsensical things - and it's absolutely fine 🙂 #hamradio #morsecode #rbn https://rbn.telegraphy.de/activity/KA2QPG

Another #WWFF activation today, OKFF-2319 (never activated before). Unfortunately I only had about 30 minutes of operating time because we...

Another #WWFF activation today, OKFF-2319 (never activated before). Unfortunately I only had about 30 minutes of operating time because we still had 12 km of hiking to do to catch a train and we were a bit behind the schedule. The photo shows me throwing a wire into a tree. #hamradio

Český Krumlov, 🇨🇿 #caturday vs. #Fensterfreitag

Český Krumlov, 🇨🇿

#caturday vs. #Fensterfreitag

Early entry for #hamchallenge week 29: During our hiking tour close to Cesky Krumlov today we took a break in OKFF-2717 (Vyri vrch) and I...

Early entry for #hamchallenge week 29: During our hiking tour close to Cesky Krumlov today we took a break in OKFF-2717 (Vyri vrch) and I set up my Elecraft K1 and made 45 QSOs on 20/30/40m. It was the first ever activation of this OKFF reference. We were blessed with perfect weather, but conditions were rather poor. #HC29S @hamchallenge #hamradio #morsecode

Never not watching the #QRSS grabbers. Greetings from OK/DJ5CW/m on the bus to Budweis... #hamradio

Never not watching the #QRSS grabbers. Greetings from OK/DJ5CW/m on the bus to Budweis... #hamradio

#caturday #olympiadorf #münchen

#caturday #olympiadorf #münchen

Progress on my #SO2R band decoder and antenna switch controller. I killed one of the outputs of the relay driver (by stupidity), but...

Progress on my #SO2R band decoder and antenna switch controller. I killed one of the outputs of the relay driver (by stupidity), but fortunately it has eight channels and I only need six, so I nonchalantly rewired one 🙂 . The big 78L05 in the TO-220 is the replacement for the REG101UA which I designed in initially, but then I noticed it can only handle 10V at the input. Now it's time to write some code for it! #hamradio

Very nice idea: #Antenna length switching by small Bluetooth controlled relays (from IK6BAK). https://www.morsekey.net/efhw-switch #hamradio

Very nice idea: #Antenna length switching by small Bluetooth controlled relays (from IK6BAK). https://www.morsekey.net/efhw-switch #hamradio

Although recent changes in the privacy settings of browsers have largely rendered http referrers useless for a website owner to check...

Although recent changes in the privacy settings of browsers have largely rendered http referrers useless for a website owner to check incoming links, once in a while they still *do* turn up obscure and interesting things. Today I found an incoming link to my dated "Morse My IP" website (https://fkurz.net/ham/mmi/) from the open source web search page "MWMBL" and the link was part of a "curation" (https://mwmbl.org/app/curations/6012/), which also contained a noteworthy site: https://crymyip.com/ 😭

#hamchallenge week 16: Work a xOTA station. This last week I was travelling and although I took my remote stuff with me, I barely had time...

#hamchallenge week 16: Work a xOTA station. This last week I was travelling and although I took my remote stuff with me, I barely had time to get on the air. But I worked three station that qualify: DL3BRE/P (WFF), DL4FDM/P (SOTA) and DL6YYM/P (WFF). The latter is the maker of the famous Bamatech Morse paddles! https://www.bamatech.net/morsetasten/ HC16S @hamchallenge

Time to start assembling the SO2R band decoder and antenna switch... the PCBs arrived from @aislerhq the other day and look great! #hamradio...

Time to start assembling the SO2R band decoder and antenna switch... the PCBs arrived from @aislerhq the other day and look great! #hamradio #electronics

For this week's #hamchallenge I observed the QRSS transmissions of S52AB on 30m. They're running 24/7 so it's a good indicator...

For this week's #hamchallenge I observed the QRSS transmissions of S52AB on 30m. They're running 24/7 so it's a good indicator for the propagation on this 800km path. Each day I noted the times when the signal became visible in the morning and when it disappeared. The results are tabulated below. Typically the signal comes out of the noise with a big peak in the morning and then becomes weaker again, the same peak can be observed before it fades out. HC15S @hamchallenge

For #hamchallenge week 15 (#HC15) I will monitor the QRSS transmissions on 30m by S52AB. The reception usually follows a clear pattern: The...

For #hamchallenge week 15 (#HC15) I will monitor the QRSS transmissions on 30m by S52AB. The reception usually follows a clear pattern: The signal appears in the morning when the skip zone gets small enough to arrive, during the day we see increased D layer absorption, and some time at night the signal disappears again. Interestingly, if often briefly re-appears at night, probably due to sporadic E. #hamradio @hamchallenge

Snow on the SO5CW webcam this morning! 425 QSOs in the #SPDX #Contest so far. Come join the contest: https://spdxcontest.pzk.org.pl/2025/ ...

Snow on the SO5CW webcam this morning! 425 QSOs in the #SPDX #Contest so far. Come join the contest: https://spdxcontest.pzk.org.pl/2025/ #hamradio

#hamchallenge Week 14: My #hamradio logbook #backup system is simple: My central log (to which I live-log contacts and import all my contest...

#hamchallenge Week 14: My #hamradio logbook #backup system is simple: My central log (to which I live-log contacts and import all my contest logs) is the console logger "YFKlog", which uses a MySQL database backend. It's running on a Hetzner VPS which creates nightly snapshots of the system disk that reach back seven days. In addition, a nightly cron-job creates a database dump which gets rsynced to another VPS in another datacenter. I also regularly upload my log to LoTW. #HC14S @hamchallenge

Space Ballon des Bodensee-Gymnasiums Lindau vermisst (#jugendforscht Projekt)!...

Space Ballon des Bodensee-Gymnasiums Lindau vermisst (#jugendforscht Projekt)! https://spaceballoon.bodensee-gymnasium.de/2025/03/20/wir-sind-gestartet-und-jetzt-brauchen-wir-euch/
#munchen #amateurfunk #munich

@hslodz SP7HACK from Hackerspace (Hakierspejs) Łódź now on 7014.8 kHz CW with @sp7q at the key. Great to hear Hackerspaces on the air!...

@hslodz SP7HACK from Hackerspace (Hakierspejs) Łódź now on 7014.8 kHz CW with @sp7q at the key. Great to hear Hackerspaces on the air! #hamradio #morsecode #hackerspace

"Einsteiger, Funkbegeisterte und Contester,ich lade euch herzlich zu einem weiteren, spannenden Online-Contestseminar ein! Unter dem...

"Einsteiger, Funkbegeisterte und Contester,
ich lade euch herzlich zu einem weiteren, spannenden Online-Contestseminar ein! Unter dem Titel „Projekt Weltrekord beim #CQWW DX CW #Contest berichtet OE1EMS/E77DX Emir Memić über die Planung und Durchführung des Weltrekords beim CQWW DX CW Contest 2024."

https://oevsv.at/oevsv/aktuelles/Save-The-Date-Online-Contestseminar-Projekt-Weltrekord-beim-CQWW-DX-CW-Contest/

#Amateurfunk #HamRadio