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 Radio Australia (RACAR) Carnarvon, WA 1975 to 1996
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 Return to top of page · Post #: 1 · Written at 12:01:50 PM on 19 June 2017.
Garyoz's avatar
 Location: Perth, WA
 Member since 19 November 2008
 Member #: 381
 Postcount: 239

I was going through some old PMG photos and found a photo of this power meter reading.
It must be from the Brown Boveri, 250kW transmitter.

There were three transmitters installed in the old NASA building.
• VLK, Brown Boveri, 250kW (1975)
• VLM, 300kW Thomson (1984)
• VLL, 100kW Harris. (1976)
It was built as a temporary station after Cyclone Tracy destroyed Cox Peninsula, Darwin in 1974.
It was closed in July 1996. The 250kW and 100kW were scrapped and the 300kW moved back to Darwin as VLT.

Here is the proposed coverage footprint.

RACAR
RACAR


 
 Return to top of page · Post #: 2 · Written at 7:44:13 AM on 20 June 2017.
Fred Lever's Gravatar
 Location: Toongabbie, NSW
 Member since 19 November 2015
 Member #: 1828
 Postcount: 882

Hi I wish I had taken photos like that of systems I was involved with!
At the time a panel like that just showed normal readings that may have been logged in a journal and just indicated "all good".

The engineer in me does a mental sum 1300v at 30 amp is about 590kw the forward power is about 230kw does that mean the overall efficiency Pin / Pout is about 46%?

That's just the sort of thing you do when you walk past a panel with meters.
Nowadays there would be 28" TFT or whatever screen with every function from soil acidity to antenna temperature displayed in 13 different colours but nothing appeals to me than a bank of good old needle pointers that are sitting in the normal zone!

Fred.


 
 Return to top of page · Post #: 3 · Written at 9:39:40 AM on 20 June 2017.
Marcc's avatar
 Location: Wangaratta, VIC
 Member since 21 February 2009
 Member #: 438
 Postcount: 4342

There was a lot of work done on AM modulation: Some early AM transmitters were rather inefficient 150KWin for 100KW out was one I saw ages ago.& I have heard of 33% losses.

I think RA was at around 85% before they closed it & are selling it for a horse paddock. Same consideration as destroying the historic 2C0 site & probably selling the the Alexanderson antenna for Beer money.

Marc


 
 Return to top of page · Post #: 4 · Written at 4:47:37 PM on 20 June 2017.
GTC's avatar
 GTC
 Location: Sydney, NSW
 Member since 28 January 2011
 Member #: 823
 Postcount: 6012

Nice shots. Love the map.


 
 Return to top of page · Post #: 5 · Written at 10:42:08 AM on 21 June 2017.
Garyoz's avatar
 Location: Perth, WA
 Member since 19 November 2008
 Member #: 381
 Postcount: 239

Here are photos of the antenna array.
It used electric winches for lowering or raising the array for maintenance or when a cyclone was approaching.

RACAR
RACAR
RACAR
RACAR


 
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