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DK3CW Germany flag Germany

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August 2017: Back from attending YOTA 2017 cycling Frankfurt–London–Frankfurt (1,745 km). Outward and return journey on APRS.


August 2016: Back from transalpine SOTA Cycling and Hiking in DL, OE and I: Preliminary Reports and Pictures

Wrkd Alex, KF5ONO@DP0ISS (International Space Station) on Novemeber 8th, 2014:



Global Emergency Communication
Providing Global Emergency Communications during Disasters




Next SOTA Activity To be anounced... --> Track ascent and descent DK3CW-8 (by foot) & DK3CW-7 (by bicycle).

My website

My Blog

Fascinated by amateur radio operation at the local club station DL0DPM (located at the comunication museum in Frankfurt), I was taking an entry-leve amateur radio course in 2006. I've been licensed since autumn 2007 aged thirteen under DO3HPR. In December 2011, I passed the Advanced Licence (CEPT licence / HAREC) and got my present Callsign DK3CW. As I started to be on the bands, I've only had an Yaesu FT-817ND with 5 Watts QRP feeding an end-fed longwire antenna about 35 metres long and 10 m AGL (141m ASL). Antenna is still the same, but the main rig is now an Yaesu FT-100.

With passion for mountaineering and cycling (HF/VHF/UHF(SHF equipped bicycle), I enjoy portable QRP activities and activations (SOTA, IOTA, Lighthouse). I'm interested not only in the classical radiophony and telegraphy but also in QRP digital modes like WSPR (Weak Signal Propagation Reporter), JT65, JT9 or ROS. Mainly, I am working and testing digital EmComm operation via HF using WinLink 2000 Network with different Modes like WINMOR (Winlink Mail over Radio), PACTOR I-III, Automatic Link Establishment (MIL-STD-188-141 and MIL-STD-188-110) , APRS, Packet radio, D-STAR DV (via D-RATS, see below) ARDOP. Furthermore, I'm testing other HF E-Mail Modes like jPSK or RFSM-2400/8000.

Replacing antennas at the UHF Repeater site DB0VE and preparing for HAMNET (2.3/5.8 GHz)

As a participant of SOTA (Summits on the Air) and GMA (German Mountain Award), the FT-817ND accompanies me during hiking, climbing and cycling to German, Austrian and British mountains. Another passion are Digital VHF/UHF Modes. I began using Packet Radio (1k2 and 9k6) and D-STAR. Specially on D-STAR and packet radio, I use the programm D-RATS. Its a data communication tool based on the D-RATS Digital Voice (DV) protocol and ARQ-protocol which offers low speed data transfer. Later on I added APCO P25, DMR (Digital Mobile Radio), TETRA and SystemFusion. Since 2010, it became my passion to take part in SSB and Digital Contests on Shortwave (e.g. Fielday, CQWWDX, WAG, WAE, Ukrainian DX contest, Educational contest, SARTG, PACC, UBA, QSO Party, XMAS, DARC 10m Contest, ARRL 10m Contest ...), but also in a few VHF / UHF contests. Seldom, I am organizing Foxhunting events or do foxhunting my self. I used to be a member of the ARDF unit of the DARC district Hessen. Also I was responsible for emergency communications at my local club (Emergency Communication Representative).

Since 2013, I am programming ham radio scripts in variouse programming languages for amateur radio purposes as well as using and collaborating in building the 2.3 GHz / 5.7 GHz european HAMNET as a quite modern field of amateur radio.

Club Calls, under which I was active (mostly in contests):

  • DP6T Contest Group Wittgenborn (WAG contest, CQWWDX contest, ARRL 10m Contest, IARU HF, CQ WPX, DARC 10m ...)
  • DK0CW (SSB IARU Region 1 Fieldday)
  • DL0FM (UHF Contest)
  • DB0FJG (VHF contests)
  • DK0FX (Hessencontest shortwave)
  • DL0HG DL0HES and DL0F (Hessenday 2011)
  • DL0FFM (in occasion of the 65. anniversary of my club)

Membership numbers:

  • EPC (European PSK Club) # 17791
  • DMC (Digital Modes Club) # 05242

Also member of:

Furthermore I´m interested in natural sciences, especially astrophysics and botanic but also in the humanities muchly philosophy. Some of my freetime activities are hiking (in combination with SOTA and GMA), climbing, Wing Tsun-Kung Fu, programming, Wikipedia -author (e.g. ham radio articles), playing the classical guitar...

Transmitting modes: SSB (J3E), PACTOR I-III, (Q)PSK31/63/125, RTTY (F2B), WSPR, WINMOR, Automatic Link Establishment, JT65, JT-9, ROS, OPERA, OLIVIA, CONTESTIA, MT63, PACKET RADIO (1k2,9k6), RFSM-2400/8000, ARDOP, FM (F3E), D-STAR (Digital Voice), APCO P25, TETRA, DMR, SystemFusion

Working conditions & Equipment:

QRP-Transceiver: YAESU FT-817ND | Filter (CW, digital modes): Collins YF-122C 500 kHz

HF-Transceiver (fixed and bicycle mobile operation): FT-100

Max. Output: 5 Watts | Tuner: MFJ-16010 (manual) and MFJ-928 (automatic)| Antenna (Shortwave): end-fed longwire antenna (~40m)

PACTOR-II Controller with PACTOR III Licence

Antenna (2m / 70cm / 23cm): DIAMOND X-6000, Omnidirectional antenna vertical

Antenna (70cm): HB9CV (Ochsenkopfantenne)

Mobile antenna (2m / 70 cm): DIAMOND MR-177 | Portable antenna (HF): MK-2 ATX-1080

Analog HT: YAESU VX 8-E (GPS + APRS + Echolink)



DMR HT: Motorola DP3600 / XPR6550

TETRA HT: Motorola MTP-850S

SystemFusion HF: FT1D


My logbook, QSO Maps and where I ´m actually QRV


EmComm Exercice EDFB DK3CW & DL1ZAV via HamNet 2,3GHz

EmComm Fieldday Exercise EDFB. Right: Rudolf, DL1ZAV. Left: DK3CW. QRV HF and HAMNET 2.3GHz



HAMNET 2.3 GHz Mobile Phone PABX & UHF Motorola Analog F3E / Digital D-STAR and APCO P25 RPTR

HAMNET 2.3 GHz Mobile Sip-Phone PABX - User LIST

Mobile HAMNET WinLink RMS-Relay - Telnet/POP/SMTP SERVER & SIP PABX Client / TeamTalk 4 Voice & Video

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Interesting links

Check out my detailed link list for more links...



8347782 Last modified: 2017-09-24 08:35:27, 22309 bytes

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