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. 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 has been QRV on the 472 kHz MF band too. 19 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, 9H1 (real CW only). More information about this MF band see http://www.472khz.org/
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 (5 km away in a forest) - especially from LF to 10,1 MHz due to continually increasing local noise level. 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 whip, 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 diversity reception by fast manual changing between the available receivers and their antennas often results in superb improvements of signal readability during tough conditions.
Main 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 (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. 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 structures 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"):
7707727 Last modified: 2016-11-20 07:25:57, 8675 bytes
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