Return-Path: Received: (qmail 8331 invoked from network); 10 Aug 1999 09:44:37 +0100 Received: from magnus.plus.net.uk (HELO magnus.force9.net) (195.166.128.27) by guiness.force9.net with SMTP; 10 Aug 1999 09:44:37 +0100 Received: (qmail 15468 invoked from network); 10 Aug 1999 08:48:08 -0000 Received: from unknown (HELO post.thorcom.com) (212.172.148.70) by magnus.plus.net.uk with SMTP; 10 Aug 1999 08:48:08 -0000 X-Priority: 3 X-MSMail-Priority: Normal Received: from majordom by post.thorcom.com with local (Exim 3.02 #1) id 11E6wF-0004Em-00 for rsgb_lf_group-outgoing@blacksheep.org; Tue, 10 Aug 1999 09:07:15 +0100 Received: from mail2.hamilton-standard.com ([153.4.57.12]) by post.thorcom.com with esmtp (Exim 3.02 #1) id 11E6wD-0004Ef-00 for rsgb_lf_group@blacksheep.org; Tue, 10 Aug 1999 09:07:14 +0100 Received: from curly.hsd.utc.com by mail2.hamilton-standard.com; (8.9.1/) id EAA26992; Tue, 10 Aug 1999 04:12:21 -0400 (EDT) X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 Received: from umrsvr.hsd.utc.com by curly.hsd.utc.com; (5.65v3.2/1.1.8.2/27Feb96-0334PM) id AA03145; Tue, 10 Aug 1999 04:05:16 -0400 Received: from nmex01nt.hsd.utc.com by umrsvr.hsd.utc.com; (5.65v3.2/1.1.8.2/27Feb96-0334PM) id AA24497; Tue, 10 Aug 1999 04:04:13 -0400 Received: by nmex01nt.hsd.utc.com with Internet Mail Service (5.5.2448.0) id ; Tue, 10 Aug 1999 10:01:08 +0100 Message-ID: From: "Soegiono, Gamal" To: rsgb_lf_group@blacksheep.org Subject: LF: Donebach LF-BC-station profile (153kHz) Date: Tue, 10 Aug 1999 10:01:03 +0100 X-Mailer: Internet Mail Service (5.5.2448.0) Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org Sender: Content-type: text/plain; charset=windows-1252; format=flowed MIME-Version: 1.0 Content-transfer-encoding: 8bit Hello all, just retreived some technical data from german LF-BC-station in Donebach broadcasting the program of Deutschlandfunk (alias Deutschlandradio Koeln). Perhaps the values listed here are beneficial for field strength measurements. ======Donebach Profile Start======================== allocated frequency 153.0 kHz (+/- 4.5 kHz for audio sidebands) attenuation at sideband boundaries -60dBc attenuation beyond sideband boundaries better -80dBc coordinates of the center of antenna system: 49N34 09E11 (degrees/minutes) continuous operation 24 hours, 7days daytime transmitter power = 500 kW nightime transmitter power = 250 kW at the moment (daytime saving time in effect = CEST) daytime operation is from 03:00 UTC to 18:00 UTC nightime operation is from 18:00 UTC to 03:00 UTC during normal time (CET) daytime operation is from 04:00 UTC to 19:00 UTC nightime operation is from 19:00 UTC to 04:00 UTC Antenna system comprises two masts of equal mechanical design. total mast height 363 meters from ground level masts are of the lattice type, 2m by 2m in cross section, base is not isolated but directly grounded to a burried radial system consisting of 60 radials 360m each. The masts are guyed at 6 levels: level-1 = 63m and level-2 = 120m 3 guy wires separated 120 degrees, isolators (7m) directly at the mast level-3 = 180m and level-4 = 242m 3 guy wires separated 120 degrees, aligned in azimuth with guys of level-1 and -2. guy wires are bonded to the mast inclining 53 deg and 45 deg respectively and have isolators (7m) after 150 m. So these guys act as capacitive loading. level-5 = 308m 3 guy wires separated 120 degrees, aligned in azimuth 60 deg off the guys of lower levels. The guys are directly bonded to the mast incline exactly 45 degs down for a length of 250m where 7m isolators breaking the remaining run to ground electrically. About 150m from the mast feed wires are attached (one for each guy wire) which slope down to the mast base where all are bonded together to form the feed point of the antenna. This level acts as part of a folded monopole as well as capacitive loading. level-6 = 343m 3 guy wires separated 120 degrees, aligned in azimuth with guys of level-5. The guys are directly bonded to the mast, incline exactly 45 degs down for a length of 165m where 10m isolators breaking the remaining run to ground electrically. So these guys act as capacitive top loading. These two masts are separated by about 600m on a line beaming 111/291 degrees. Each mast feed has its own matching unit receiving transmitter power from a power divider and phasing network located at the antenna system's center. During daytime operation, 500kW are fed to the mast on the western side, the eastern side mast remains grounded at it's feed, acting as a passive reflector. During nighttime operation, 250kW are fed, asymmetrically divided, to both masts. The antenna system acts like a phased array. Following a simplified representation of actually measured (on ground and by helicopter) Radiation patterns: ----------------------------------------------------- Daytime Operation Azimuth Radiation pattern for TOA=zero! nominal 500kW transmitter power EMRP Azimuth Sectors (east of north) 29dBkW 310-20 degs 28dBkW 20-35 degs 190-310 degs 27dBkW 35-42 degs 175-190 degs 26dBkW 42-50 degs 160-175 degs 25dBkW 50-60 degs 145-160 degs 24dBkW 60-145 degs ----------------------------------------------------- ----------------------------------------------------- Nighttime Operation Azimuth Radiation pattern for TOA=zero! nominal 250kW transmitter power EMRP Azimuth Sectors (east of north) 26dBkW 335-5 degs 200-227 degs 25dBkW 5-25 degs 190-200 degs 227-335 degs 24dBkW 25-45 degs 180-190 degs 23dBkW 45-55 degs 172-180 degs 22dBkW 55-62 degs 165-172 degs 21dBkW 62-67 degs 157-165 degs 20dBkW 67-73 degs 150-157 degs 19dBkW 73-76 degs 145-150 degs 18dBkW 76-80 degs 140-145 degs 17dBkW 80-85 degs 135-140 degs 16dBkW 85-90 degs 130-135 degs 14dBkW 90-130 degs ----------------------------------------------------- ======Donebach Profile End ========================== 73 de Gamal