Hi, nice to see you on this page!
As far as I can think back I have always been enthusiastic about radio. As a schoolboy of 14 years I became a member of the German DARC. In 1966 I got my license with the callsign DK1IS at the age of 17. From the beginning I´ve been QRV mostly in CW on the HF bands with the usual periods of reduced activity due to study, job and family. Now I´m married and we have two grown sons. Since 1981 we have lived 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´m a retirement 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. 23 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 (mostly in DFCW). Since June 2013 DK1IS is QRV on the 475 kHz MF band too. 17 countries worked on MF up to now: DL, EI, F, G, HA, HB9, I, LA, OH, OK, OM, ON, PA, S5, SM, SP, 9H1 (real CW only).
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: 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 at our club station DL0AO (5 km away in a forest) - especially from LF to 10,1 MHz due to continually increasing local QRM level.
Antennas: Vertical helix 8 m for 7 - 30 MHz. Marconi-T, 13 m high, 33 m top load with 4 wires, 3 m wide for LF, MF and HF, C = 660 pF, R = 30 Ohms, measured at 136 kHz respectively 12 Ohms at 473 kHz. Antennas remote selected and fed from the shack via 3 vacuum relais and 2 lines of RG 213, 25 m each. Autotransformer 50-30-12 Ohms for LF and MF. 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 stuctures at the terrace side of the house.
Vy 73 es hpe to cuagn on the air!
Here are some pictures of my LF/MF station:
PA, top view:
RF compartment, bottom view, fan plate removed:
LF/MF tuner in the arbour:
Brown smoke at the feed through insulator from an unlucky former spider ...
LF/MF tuner, left side:
Back side of arbour ("tuning house"):
1636935 Last modified: 2015-01-25 14:58:43, 7782 bytes
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