dj5cw - Network

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

Shell out €35 to have a #PCB (or the minimum order quantity of three, of which I will only use one...) professionally done, or etch it...

Shell out €35 to have a #PCB (or the minimum order quantity of three, of which I will only use one...) professionally done, or etch it myself? 🙂 #hamradio

Sunday finger gymnastics done. These will be the inductors for a diplexer filter I am building to make my ICOM IC-7100 work on 630m,...

Sunday finger gymnastics done. These will be the inductors for a diplexer filter I am building to make my ICOM IC-7100 work on 630m, according to a design by KB8U (with some modifications): https://kb8u.home.blog/a-diplexer-filter-for-the-icom-ic-7100/ #hamradio #mediumwave

Radio Telegraphy High Speed Club member list updated. Welcome to Amanda KY4GS, HSC#2022! https://hsc.dj1yfk.de/db/hsc_list_by_number.txt...

Radio Telegraphy High Speed Club member list updated. Welcome to Amanda KY4GS, HSC#2022! https://hsc.dj1yfk.de/db/hsc_list_by_number.txt #morsecode #hamradio