Dear LF-Group!
Having read all your interesting discussions since mid 1999 and now
being active on lf again I´d like to introduce myself to the group.
My name is Thomas "Tom" Koelpin. 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 sons, both
currently students. Since 1981 we have lived in Amberg, a town in
Eastarn Bavaria, about 60 km east of Nuremberg, locator JN59WK. 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.
In early 1999 DK1IS was the first lf-station in Eastarn Bavaria, then
with a loop antenna covering the garden and half of our terrace house.
In spite of this I had a lot of nice contacts, mostly regional, the ODX
was about 530 km. In 2001 we changed homes, it´s a terrace house again
but with wonderful neighbours, much more space in the backyard and
incredible low ground resistance ... After one month of fresh activity
ODX was raised to 1540 km thanks Reino, OH5UFO. I´d be glad to work all
your famous calls in the next future!
Rig here:
HF:
TS-950SD from Kenwood
LF:
Receiver RX 1001, Exciter EX 1001, both from Hagenuk
Exciter running at 136 kHz at present, will be changed to 13,6 MHz with
additional divider-by-100 to reach 1-Hz-steps on lf
Homemade MOSFET-PA 2xBUK416 push-pull class AB, transformer coupled, 200
W RF max. at 12 V DC (was planned for portable use ...)
Antennas:
Vertical helix, 8 m for 7 - 30 MHz
Marconi-T, 11m high, 33 m top load with 4 wires, 3 m wide for lf and hf,
C = 660 pF, R = 24 Ohms, measured at 136 kHz
Antennas remote selected and fed from the shack via 3 vacuum relais and
2 lines of RG 213, 25 m each.
Couplers:
HF: Harris RF-615B in the arbour ("tuning house")
LF: Two Hagenuk-mf-variometer tuners 120 - 550 uH,
one piece in the shack for fine tuning the lf band (combined with PA),
one piece with ferrite autotransformer input in the arbour for coarse
tuning with additional homemade honeycomb loading coil, L = 1,75 mH, Q =
540.
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.
For further informations and a picture of DK1IS please have a look at
www.qrz.com
Vy 73, good luck for all of you
es hpe to cuagn on lf!
Tom, DK1IS
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