“When I was working at Himatangi Radio in the 1970s, the Campbell Island and Raoul Island weather skeds took place every three hours around the clock. From memory the main frequencies used were in 11 MHz and 5 MHz region, depending on propagation. The weather skeds generally lasted for about 15 or 20 minutes.
“Our job was to activate the transmitter from the console which was in the transmitter Hall. The transmitter used was a Redifon (I think). It ran about 1kW of compatible AM (carrier plus one sideband) but was capable of SSB too.
“The antenna was a rhombic which had a resistive termination at either end. As it happens, Raoul island is 180 degrees opposite to Campbell Island from New Zealand. Once the weather shed or phone call was completed with either Raoul or Campbell, we got instructed to change the antenna direction which was a very complex job of operating a key switch on the console. Obviously this simply reversed the termination end.
“I cant remember if the antenna was purpose-designed for that service or not. It may have well been for another circuit in earlier times.”
– Paul Chamberlin ZL1BBR, December 2019
“The first Collins was installed in 1974 while I was at Himatangi. The aerial output was coaxial (the black tube in the top right corner of the TX picture) and it fed a coaxial aerial switch matrix mounted on the wall behind it. The output of the matrix went to a high-powered balun transformer for converting the 75 ohm coax output to the standard 600 ohm open-wire feeders used on the outside plant. The transmitter was self-tuning (from data selected at the drive unit) and fed a purpose-installed vertical wideband double-discone for use on the HF shipping radiotelephone service.”
– Rex Johnson