Willum
Many thanks for your explanation. It does clarify much confusion.
I looked up the Ericsson EB1500 transmitter on the website ul
http://www.seefunknetz.de/eb1500.htm. It implies that the transmitter was not on the market until 1970 - obviously after the QE2 came into service. It was built by the Norwegian company
Elektrisk but sold by German company Ericsson.
I am now sure my memory was correct that the ST1400 was installed with remote controlled servos - which were awful to use and clearly the reason for the change to the Ericcson EB1500 prior to your arrival in 1977.
The HF notches were also awful to use and as I said wire aerials had been erected prior to the trials. There were four - two each side from a point each side of the funnel. We found problems with interaction between transmitters. The problem with the St1430 is that once tuned it would not perform a retune if there was interaction with another transmitter tuning. It would just lower the power.
Did you ever look up how the notch antennas were supposed to work ?
I cannot remember what was the reserve transmitter during my time - it was probably IMR but IMR re-badged many equipments.
I wonder if Jim Neary used the redundant servos from the main transmitter after it was changed ?
My memory totally failed me as regards the notch above the bridge. I thought it was VHF so I was obviously confusing it with the VHF notches up the mast. Why did they leave the receive notch there if it did not work very well ? It was very unsightly.I Presume it could have been moved further aft and would still work. Probably moving it would upset the compensation of the standard magnetic compass.
As I recall the Lincompex units as originally used had the compression/expander sub channel control outside the audio passband. Due to ITU regulations, as installed for QE2 it had to be put inside the marine audio passband with restriction of audio range. Any other station transmitting on the same frequency would mess up the control channel with their audio ! Result was it rarely got the improvement it was supposed despite a huge publicity hype at the time. Also I do not think we could use privacy/ speech inversion at the same time.
Interesting that the Piccolo was gone before you arrived. In general the Piccolo worked better than the Plessey ARQ. The problem was if there was interference then Plessey would not even get of the ground asking for repeats ! Whilst the Piccolo would continue even if there was a few errors. I do not remember much about the Plessey ARQ - I presume it was an early form of Sitor. Was Plessey still working after 1977 or had you changed to Sitor ? Piccolo and Plessey made a punched tape for the Addresograph-Multigraph Printer. From memory it punched up on a Siemens M100 looking teleprinter - at least the Piccolo did. How many unit code tape did the machine use ? It would have to be at least 7 unit but I suspect more because it had to handle different fonts and font sizes. The adverts and photos were of course put on board before sailing.
I have in front of me now the actual Daily Telegraphs printed on April 3 1969 - one of the first successful. Headline was "LEFT REVOLT AS WILSON TELLS OF FAILED MISSION "Also for May 10 and May 27 1969.
In 1969 we used Creed 444 teleprinters and it looks as if they were still in use around your time. Once again my memory fails me as to what was the the modulator and demodulator used for the RTTY signal ? Since then I have used different types in Antarctica such as Frederick. Were they US Northern Radio 152/153 units ?
Out of interest were you on QE2 in February 1985 ? I visited QE2 on 17 February 1985 in Hobart and was very impressed with the ITT STR910 frequency agile transmitter/receiver which had just been installed.
In August I will have held an amateur licence for 50 years continually. I started as G3SHG in 1964 when still at Bristol College getting my Certificate of Proficiency. Then VK6RY ( a good RTTY callsign) and have been VK7ER for 37 years !
I presume you are from Cornwall. My wife is born in Plymouth but family originally came from Newlyn. I normally go to England each year for 2 month around this time always starting in Cornwall ! In fact I should have been there now but had to cancel my flight at the last minute !
Strangely I took very few photos of QE2. Like you many of my other ship photos are on slides. For this talk I have converted some by the crude way of using a plastic diffuser/ light assembly from an old scanner and a cardboard tube around the lens of the camera against the slide. Result not perfect but acceptable. Some slides do seem to lose colour after 40 years and often appear washed out.
Anyhow, once again many thanks for the information - I am trying to get the story straight for my talk ! Its a pity there is not a website with detailed information about the radio equipment on QE2 over the years.
All the best
Roger