Von: BueschelW@web.de im Auftrag von Wolfgang Bueschel ...

moved to the newer 212 m mast, originally built for UHF (which is no
longer here either, moved for DVB-T service to a smokestack within
Leipzig).
Doomed J1 is the left one.
As well-known shortwave from Wiederau ceased in autumn 1993. The four
rhombic antennas (every one about 100 x 300 m in size) have since been
removed, like the building with the Funkwerk Koepenick transmitter than
was in use since 1972. Only the (emptied) building of the wartime
transmitter still exists.
(pictures are larger than embedded there)
Mediumwave: During the not too distant past (let's discuss GE75 times
only) the equipment consisted of two 100 kW transmitters, a Lorenz from
1939 and a Funkwerk Koepenick from 1963 (which had replaced the oldest
transmitter). Until summer 1989, when the new 1323 kHz facility at
Wachenbrunn came into operation, the transmitters were in use on 531 and
1323 kHz. They had a preference for using the Koepenick on 531, since its
modulation was noticeably better, but there was no fixed allocation.
Lorenz transmitter with SRW 357 PA tubes, made by Werk fuer
Fernsehelektronik, same ones than in 250 kW Funkwerk Koepenick
transmitters as well as the 750 kW (which was a 3 x 250 kW amplifier)
LW at Zehlendorf:
Funkwerk Koepenick transmitter with vapotron PA tubes:
(Lorenz in background)
(5 kW pre-stage)
(mod pre-stage)
Operation of these transmitters, after 1998 only occasionally, ceased in
2001. Until the very end both transmitters were operational and used
alternately. The Koepenick was on air for the last time on 13 June 2001
(13:00 til 15:00 CET), the Lorenz on 19 Juni 2001 (08:25 til 11:25 CET).
At present both transmitters still sit at their places.
Question: Which broadcasting transmitter of this age (let's say pre-1945)
was elsewhere on air after June 2001?
Also the two antennas had been used on both frequencies alternately. They
were fed via 50 ohms cable. For 1323 kHz the antenna tuning was a
downconversion on at least one antenna, which on this frequency had just
22 ohms. (Contrary the J1 had on 531 kHz about 1000 ohms.)
The old mediumwave facilities had been rounded up by a Lorenz 5 kW
transmitter, run on 729 kHz with Messewelle from Leipzig studios during
the trade fairs and Berliner Rundfunk for the rest for the year:
file:///E|/datentransfer/wwdfxc_2010/BCDX958.TXT[06.01.2011 12:39:01]