BC-DX TopNews WWDXC #945 BC-DX 945
BC-DX TopNews WWDXC #945 BC-DX 945 BC-DX TopNews WWDXC #945 BC-DX 945
Tebrau tx site was located only some 10 kms across the frontier between SNG and Johor Bahru. A lot of tall Indian/Nepalese Sikh national soldiers (tall up to 1.90 meters and weared turbans) protected that installation as security patrol. (wb, Jan 4) The two 7.5 kW transmitters of Radio New Zealand at Titahi Bay were built towards the end of WW2 and were built for the U.S. military. They were to be installed somewhere in the Pacific as communications units. However the war ended before they were delivered to the Americans and they ended up being bought by the New Zealand Broadcasting Service for a new shortwave service called "Radio New Zealand" which began in 1948. Both were capable of running either CW or AM modes but of course only ever were used in the AM mode. They were very large physically, probably as big as a current 500 kW transmitter would be. They were built by Amalgamated Wireless (Australia) Pty in Sydney on a "cost plus" contract, which meant that the more that they cost, the bigger the profit was for AWA! They were made of heavy duty steel cabinets and were built like the proverbial battleship. 7.5 kW was the most power they would deliver. I tried getting a few more watts out of them by tuning them precisely, but 7.5 kW was the limit! I have fond memories of them. One of them has been kept at Titahi Bay as a museum piece. I remember often hearing one of the BBC Tebrau 7.5 kW transmitters in the mid 1960's when I worked at the Quartz Hill Receiving Station. We used to relay the 1100 UTC BBC News on RNZ and Tebrau was normally used, 9725 kHz with 100 kW. The 7.5 kW unit was (I think) on 7230 kHz, but was never good enough to use for rebroadcasting. I also heard Greece with 7.5 and 5 kW, VOA Munich 3980 kHz 8 kW, Norway 21730 kHz with 5 kW and 25900 kHz with 1.3 kW which boomed in like 100 kW at times. Those were the days! I think it is time to clear up a misapprehension about the power currently used by Radio New Zealand International. At no time is transmitter power reduced to 50 kW, it is always 100 kW. The output of the transmitter is split between two antennas for a lot of the day, with 50 kW beamed at 35 degrees and the other 50 kW going to a 325 degrees antenna. The ITU/HFCC schedules confirm that. For instance look at this entry for 6170 kHz: 6170 1300-1600 51,56,64S,65S RAN 50 325 0 148 ENG NZL RNZ 6170 1300-1600 61S,62,63W RAN 50 35 0 148 Eng NZL RNZ 6170 1545-1900 61S,62,63W RAN 100 35 0 148 Eng NZL RNZ It clearly shows the pattern. The BBC Singapore Relay does the same thing. Look as this entry for 9740 kHz which is a 250 kW transmitter split between two antennas: 9740 0900-1600 49 SNG 125 13 146 English G BBC VTC 9740 0900-1600 51W,54 SNG 125 135 547 English G BBC VTC So the power used by RNZI is always 100 kW. Whenever someone quotes 50 kW, they are only getting half the story! (Gordon Brown-NZL, NWDXC Jan 5) file:///Z|/DOKUMENTATION-BULLETINS/WWDXD-BCDX/2010/BCDX946.TXT[11.06.2012 10:39:46]
PAKISTAN Frequency change of Radio Pakistan in Urdu WS to WeEUR: 1700-1900 NF 7535 ISL 250 kW 313 deg, ex7530*. No signal on // 9340 *to avoid 1700-1730 Ginbot 7 Radio in Amharic Tue/Thu/Sat & 1700-1730 Radio Xoriyo Ogadenia in Somali Mon/Fri (R BULGARIA DX MIX News, Ivo Ivanov, via wwdxc BC-DX TopNews Jan 4) PORTUGAL I visited the RDPi HF centre, CEOC, at Sao Gabriel on 31st December. The antenna farm is bigger than I thought it was after the installation of four new curtain or Sterba arrays, the smallest of them being the one at 45deg/Europe but which acc. to the CEOC Director enables Euro-coverage in a wide angle and better than with the still existing vertical logperiodics. I had last visited them back in 1996. The old antennae were not dismantled, so the total number at their disposal is 20, ranging from the curtain arrays to the rhombics and the above mentioned LPs. A former curtain array (year 1989) for 144deg is still in place, but not used. As to the old 100 kW tx units, just 3 of the 4 Continental are being used while the 4th acts as a components/parts supplier. Also installed, but not operational for quite some time, is a 100 kW Brown Boveri Co. It is almost self evident why the administration chose to keep it there: it means extra expenses just to take it off. The remainder consist of 3 x 300 kW THALES and 1 x 300 kW AEG (from 1989). The antenna matrix is in a wide new building next to the old tower, at the back of the tx building. The control shack in the tx hall houses modern equipment, most of which was designed and built by the RTP itself. Like the CEOC director pointed out: there was one item they didn't made, and that was the table. The inside of the nearly 60 year old site blends state of the art equipment and old pieces, from txs to the buildings themselves which clearly denote the state-defined architectural lines of that era also common in several other [MF] tx sites around the country. I was confirmed that the pathetically imposed 09AM - 05PM working time determined by the administration is *the* major source of problems whenever there's need of using the reserve units, make a last minute repair... or even activate a mere protection relay beyond the working hours. The automation does not "cure" power failures or voltage fluctuations that make the system simply shut the txs off for protection... so if no one is there, then no HF signals. Much to the despair of who's working there and is often compelled to improvise so as to keep things running, the top bosses for RTP surely show without doubt they don't care much about HF - the sole means of communication that is national and not dependent of satellite misfortunes or internet. In other words, if a tx is off for some reason, well, so much the better because the electricity bill is thus alleviated. (Carlos Goncalves-POR, wwdxc BC-DX TopNews Dec 31) RUSSIA Opening procedure of VoR Novosibirsk Spanish at 2050-2056 UT on file:///Z|/DOKUMENTATION-BULLETINS/WWDXD-BCDX/2010/BCDX946.TXT[11.06.2012 10:39:46]
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Tebrau tx site was located only some 10 kms across the frontier between<br />
SNG and Johor Bahru. A lot of tall Indian/Nepalese Sikh national soldiers<br />
(tall up to 1.90 meters and weared turbans) protected that installation as<br />
security patrol.<br />
(wb, Jan 4)<br />
The two 7.5 kW transmitters of Radio New Zealand at Titahi Bay were built<br />
towards the end of WW2 and were built for the U.S. military. They were to<br />
be installed somewhere in the Pacific as communications units.<br />
However the war ended before they were delivered to the Americans and they<br />
ended up being bought by the New Zealand Broadcasting Service for a new<br />
shortwave service called "Radio New Zealand" which began in 1948. Both<br />
were capable of running either CW or AM modes but of course only ever were<br />
used in the AM mode.<br />
They were very large physically, probably as big as a current 500 kW<br />
transmitter would be. They were built by Amalgamated Wireless (Australia)<br />
Pty in Sydney on a "cost plus" contract, which meant that the more that<br />
they cost, the bigger the profit was for AWA! They were made of heavy duty<br />
steel cabinets and were built like the proverbial battleship.<br />
7.5 kW was the most power they would deliver. I tried getting a few more<br />
watts out of them by tuning them precisely, but 7.5 kW was the limit! I<br />
have fond memories of them. One of them has been kept at Titahi Bay as a<br />
museum piece.<br />
I remember often hearing one of the B<strong>BC</strong> Tebrau 7.5 kW transmitters in the<br />
mid 1960's when I worked at the Quartz Hill Receiving Station. We used to<br />
relay the 1100 UTC B<strong>BC</strong> News on RNZ and Tebrau was normally used, 9725 kHz<br />
with 100 kW. The 7.5 kW unit was (I think) on 7230 kHz, but was never good<br />
enough to use for rebroadcasting. I also heard Greece with 7.5 and 5 kW,<br />
VOA Munich 3980 kHz 8 kW, Norway 21730 kHz with 5 kW and 25900 kHz with<br />
1.3 kW which boomed in like 100 kW at times. Those were the days!<br />
I think it is time to clear up a misapprehension about the power currently<br />
used by Radio New Zealand International. At no time is transmitter power<br />
reduced to 50 kW, it is always 100 kW. The output of the transmitter is<br />
split between two antennas for a lot of the day, with 50 kW beamed at 35<br />
degrees and the other 50 kW going to a 325 degrees antenna. The ITU/HFCC<br />
schedules confirm that. For instance look at this entry for 6170 kHz:<br />
6170 1300-1600 51,56,64S,65S RAN 50 325 0 148 ENG NZL RNZ<br />
6170 1300-1600 61S,62,63W RAN 50 35 0 148 Eng NZL RNZ<br />
6170 1545-1900 61S,62,63W RAN 100 35 0 148 Eng NZL RNZ<br />
It clearly shows the pattern.<br />
The B<strong>BC</strong> Singapore Relay does the same thing. Look as this entry for 9740<br />
kHz which is a 250 kW transmitter split between two antennas:<br />
9740 0900-1600 49 SNG 125 13 146 English G B<strong>BC</strong> VTC<br />
9740 0900-1600 51W,54 SNG 125 135 547 English G B<strong>BC</strong> VTC<br />
So the power used by RNZI is always 100 kW. Whenever someone quotes 50 kW,<br />
they are only getting half the story!<br />
(Gordon Brown-NZL, NW<strong>DX</strong>C Jan 5)<br />
file:///Z|/DOKUMENTATION-BULLETINS/WW<strong>DX</strong>D-<strong>BC</strong><strong>DX</strong>/2010/<strong>BC</strong><strong>DX</strong>946.TXT[11.06.2012 10:39:46]
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