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DK1IS Germany flag Germany

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QSL: VIA BUREAU OR DIRECT

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Ham Member Lookups: 13631

 

Hi, nice to see you on this page!

As far as I can think back I have always been enthusiastic about radio. Born in Hamburg at the end of 1948, as a schoolboy aged fourteen I became a member of the German DARC. In 1966 I got my license with the callsign DK1IS at the age of seventeen. From the beginning I was QRV mostly in CW on the HF bands with the usual periods of reduced activity due to study, job and family. I´m married and we have two grown sons. Since 1981 we have been living in Amberg, a town in Eastern Bavaria, about 60 km east of Nuremberg. After 17 years of working in the electrical industry I changed to the newly Amberg University of Applied Sciences in 1998 as a Professor of Electrical Engineering. Since 1999 I have been the dean of our faculty and since 2011 I´ve been a pensioner.

In 1999 DK1IS was the first LF station in Eastern Bavaria on 135.7 - 137.8 kHz. After moving in 2001 now I have much better possibilities to be active in that fascinating part of the spectrum. 24 countries worked on LF up to now: DL, F, G, GI, GM, HA, HB9, I, LX, OE, OH, OK, OM, ON, PA, S5, SM, SP, SV, RA6, UW8, YU, Z3, 9A3 (mostly in DFCW). Since June 2013 DK1IS has been QRV on the 472 kHz MF band too. 20 countries worked on MF up to now: DL, EI, F, G, GM, HA, HB9, I, LA, OH, OK, OM, ON, OZ, PA, S5, SM, SP, YO, 9H1 (real CW only). More information about this MF band see http://www.472khz.org/

Rig here:

HF: Kenwood TS-950SD, controlled by external GPS standard; Kenwood TS-50S (powered by solar cells plus accu).

LF, MF: Receiver RX1001, Exciter EX1001, both from Hagenuk, optionally controlled by external rubidium frequency standard from Rohde & Schwarz. Exciter running at 13.6 MHz respectively 4.73 MHz followed by a frequency divider for 1-Hz-steps on LF and 10-Hz-steps on MF. Homemade tube PA 2 x 4 x PL519 push pull class B, broadband transformer coupled, max. 800 W RF on LF and MF, plate efficiency 73% at 600 V DC. QRV in CW, QRSS, DFCW. Alternative exciter (most commonly used now): Frequency synthesizer MG 100 M from Schomandl, 0.1-Hz-steps for CW and DFCW up to 100 MHz, optionally controlled by external rubidium frequency standard too.

Additionally access via www to a remote RX site with Perseus SDRs and a lot of different antennas at our club station DL0AO (about 6 km away in a forest) - especially from LF to 10,1 MHz due to continually increasing local noise level. At DL0AO we also have a RX system for VLF/ELF, see http://df6nm.bplaced.net/dl0ao/VLFgrabber/vlfgrabber_dl0ao_test.htm. Since June 2016 there has been one more remote controlled SDR RX site on my garage, about 100 m away from my home and fed by a solar system, no utility mains. Selectable RX antennas there: active rod, earth dipole 42 m with four remote controlled grounding configurations and a rectangular horizontal loop 11 sqm right on the garage roof. Noise level up to 30 dB better than at home. Data transfer via a private 5-GHz-Ethernet-link. A kind of audio diversity by fast manual changing between the available receivers and their antennas often results in superb improvements of signal readability during tough conditions.

Main antenna: Marconi-T, 13 m high, 33 m top load with 4 wires, 3 m wide for LF, MF and HF (on HF you rather may call it inverted ground plane), C = 660 pF, R = 30 Ohms, measured at 136 kHz respectively 12 Ohms at 473 kHz. Autotransformer 50-30-12 Ohms for LF and MF. HF spare antenna with different radiation pattern and less efficiency: Vertical helix 8 m. 
Antennas remote selected and fed from the shack via 3 vacuum relais and 2 lines of RG 213, 25 m each. Additional active rod HE-011 from Rohde & Schwarz for reception.

Couplers: Harris RF-615B in the arbour ("tuning house") for HF. MF: remote controlled (by barbecue grill motor) Hagenuk-MF-variometer tuner 120 - 550 uH in the arbour plus additional homemade honeycomb loading coil for LF, L = 1.75 mH, Q = 540 with forced radial air cooling for long key down periods. Antenna current 5 A, antenna voltage 8.9 kV RMS measured at 136 kHz, 750 W.

Ground: 3 bare copper wires 6 m, buried 20 cm below the lawn with ground rods 1 m at each end + 2 ground rods 3 m + mains ground + water pipe system + all metal structures at the terrace side of the house.

Vy 73 es hpe to cuagn on the air!

Tom, DK1IS

 

Here are some pictures of my LF/MF station:

 

LF/MF Rack:
PA, PA power supply, RX1001, EX1001

 

 

PA, top view:
Vf/-Vg1/+Vg3 transformer, mains & TR contactors, RF compartment. Thermal management by
pressurised chassis, air outlet holes and thermo shields, transferring thermal radiation to convection.

 

 

RF compartment:
2 x 4 x PL519 in push-pull with individual biasing, resulting in a plate dissipation of 180 W and a
transconductance of 180 mA/V per side. Output transformer, thermo shields, air outlet holes and
outlet gaps around the tube sockets. Eurocent coins make good hubs for the plate connections.

 

 

RF compartment, bottom view, fan plate removed:
Lower middle: RF input transformer
Gray flat cable: control grid bias and cathode current sensor line for each individual tube
Upper middle: HV filter at center tap of output transformer

 

 

Power supply:
Vp 600V 2A DC, Vg2 180V 0.6A DC. Starter electronic due to inrush and charging currents.

 

 

LF/MF tuner in the arbour:
Variometer remote control (barbecue grill motor)

 

 

LF/MF tuner:
Variometer, radial cooled honeycomb LF coil, vacuum relais LF/MF/HF

Brown smoke at the feed through insulator from an unlucky former spider ...

 

 

LF/MF tuner, left side:
Autotransformer 50/30/12 Ohms, RF current sensor (gray box),
fan for radial cooling of honeycomb LF coil
.

 

 

Back side of arbour ("tuning house"):
Antenna disconnecting and earthing switch, pulse activated via thyristors
from a capacitor 3300uF charged to 200V DC (bird´s and cat´s bogle).

Hands off at switching or transmitting!



 

                    Marconi´s end on a frosty winter morning:                   

                 

 

 

Always 10 years older than me, still walking strong:
German 2-v-1 RX Torn. E. b/24b "Berta" from 1938, 96.6 - 7095 kHz
I was lucky to get it from a ham buddy in 1964

         
 

8382689 Last modified: 2017-10-11 16:35:19, 9981 bytes

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QRZ Logbook Summary for - DK1IS
Latest Contacts for DK1IS at QRZ.com
dedateband mode grid Country op
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YL2GP 2017-09-11 60m CW KO26aw Latvia Alexander Soldatenko
OJ0/UA4WHX 2017-09-09 60m CW Finland
LA8BCA 2017-09-09 60m CW JP41uq Norway Terje Finsveen
DL4IA 2017-09-09 60m CW AA00aa Germany Bernd Tanneberger
LZ100SK 2017-09-08 40m CW Bulgaria Bulgarian Club Blagovestnik
MW0EDX 2017-09-08 160m CW IO82kr Wales Anton Koval
OJ0/UA4WHX 2017-09-08 160m CW Finland
UR9QW 2017-09-08 80m CW LO55xg Ukraine Nickolay M. Tsebageev
G4LNA 2017-09-08 160m CW IO91st England Paul Balaam
OK1APT 2017-09-08 160m CW JO70qm Czech Republic MIROSLAV MACHACEK
DL3BUE 2017-08-31 60m CW JO72fh Germany Joerg Schulz

Book Totals: 728 qso's   108 confirmed Get a free logbook at QRZ.COM


c
World Continents Award#14098
Granted: 2016-06-12 19:58:01   (DK1IS)

Endorsements:
  • 20 Meters Mixed
  • Mixed CW
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