I know that feeling well :-( I've not got a decent short wave receiver at the moment anyway. The thought just crossed my mind, what is on 500kHz now? Just static or is it used?I noticed that and being an old stick-in-the-mud all I thought of was -
"It's life Jim, but not as we knew it"[=P]
Definitely nostalgic though. I got reported for calling like that!
I shall now go and watch "QRT500" again to put myself in the mood.:sweat:
There are at least two INMARSAT geo-stationary satellites over each Ocean so failure of one does not compromise the system. All ships going outside VHF coverage have to carry MF transmitting/receiving facilities (voice and DSC in the 1.6MHz to 3.8MHz band). All ships going outside MF range must carry either satellite voice & telex facilities or HF (4 - 16MHz) voice and DSC facilities. All ships going outside VHF range must carry COSPAS/SARSAT automatic satellite relay alerting and positioning beacons (121.5MHz and 406MHz). The latter can float-free in the event of a vessel sinking and automatically transmit alerting signals via a network of polar orbiting beacons to dedicated shore stations operated by SAR authorities world-wide.Don't know how many satellites there are but it seems a bit like only having one coast station to cover the whole of Europe, etc.
What happens when someone decides to upload a high power signal to swamp all the channels. Today's systems don't allow for long range (better than line of sight) intership communication like 500's 1500nm during silence periods.
You are right Kris to say that the Morse arrangements were not considered dodgy by the survivors of the Titanic "at the time". But almost a century later it made no sense to retain that system, ignoring the many improvements and advances that had been developed by the rest of the communications industry during the decades that had passed since then. "People in power" recognised that a system that was fitted on only a small percentage of ships at sea (albeit they were the biggest ships) and that could be operated by only one (suitably trained and skilled) person aboard each of those ships, could never be described as the optimum solution to emergency alerting and communications.Thankyou Ron.
I'm sure the survivors of Titanic and the people in power who heaped awards and praise on Marconi didn't think it was that dodgy at the time.
Agree with you completely Kris. There was an immense personal satisfaction in clearing traffic to a 3rd World HF station, half way around the world (and keeping only occasional watches) with only 80 watts or so. Similarly when you sorted a particularly obscure intermittent equipment fault that had been reported by any number of previous R/Os and shore technicians. However only you got any benefit from the resultant warm glow; the rest of the people aboard were totally oblivious to your "achievement".It's a comfort thing, Ron.