I went to the web site and read the whole story from the beginning.
This is the paragraph BEFORE the one posted in the originl post.
"Kick Off
I don't remember the exact time at which we reached the two hundred mile Total Exclusion Zone, or the war zone placed around the Falklands, as the 6 hour shifts left little distinction between night and day. My particular job at the radar display was the most important job of the lot as I was the long distance air surveyor. I operated 1022 radar which covered the distance 256 miles down to 128 miles radius from the ship. My job was to report immediately any contact appearing on the display. The whole fleet relayed on me and let me tell you now I never missed a contact, even after sitting at my display for hours on end.
It was an anticlimax that first official day of war. I remember hoping for a satisfactory outcome between the two governments so that we could turn round and go home. The next day I lost any hope of this as things took a turn for the worst. Argentinean fighter planes started to attack us. I'll never forget that very first time a contact suddenly appeared on my display bearing around 240 at 180 miles, the next sweep of the radar and it was still there, "My God this is for real ! ", I thought. I logged it in to the computer then I tried to report it to the next in the chain of command, but I could not speak the words. It was at this moment I confronted the possibility of my own death and that took some time to come to terms with. After a few moments I found my voice and the wheels of war were set in motion. Our planes where sent to investigate, a dog fight took place and the Argentineans were shot out of the sky. "A job well done" I remember the men cheering as the planes went down, cheering because two young men were dead! It went on like this for the first few days and we worked out that the Argentinean fighter pilots could not night fly as they would attack only when it was light and mainly at dawn and dusk. This was to our advantage as a pattern was set and it gave us time to rest and recuperate at night."
So a few days before, he had a contact at 240, 180 miles out that turned out to be Argies and they were shot down but a few days later he had a contact at 250 and at 180 miles and was told nothing was there ?
Seems strange.