Post by JMB99Post by ScottCan a transmitter easily
be turned on and off or does it continue to operate in silence?
Usually things are more reliable if not switched off and on - isn't
there a light bulb somewhere that has been working for over a hundred years?
It was outside a fire station in America when someone first noticed its
great age; it may still be, though now has its own special power supply
to protect it. (Thinking about it, probably DC. And I'd expect slightly
under-run.)
Transmitters, certainly valved ones, would I think benefit from not
being switched off and on a lot. On the other hand, when we're talking
of any significant power, the electricity bill has to be weighed against
the replacement cost (including labour costs). I imagine there's a
compromise where they're kept powered in terms of HT supplies (and
filament supplies for valves) but not actually outputting kilowatts or
more.
Post by JMB99I think there was an improvement in reliability when the BBC UHF TV
services went 24 hours.
Wouldn't surprise me.
Post by JMB99Famously when Tommy Flowers proposed using valves in Colossus at
Bletchley Park, many were sceptical but he had worked with valves at
Dollis Hill and knew they could be reliable if treated carefully.
Given the alternative was relays, I am not at all surprised an
improvement was both expected and realised!
Post by JMB99By the way posted in this elsewhere in a discussion about the snow today.
[]
Post by JMB99bought a small sledge which meant that for a short time, the BBC had an
official sledge.
I like it!
I think there are several other examples where the BBC - and other
similar organisations (such as parts of government) - had, and probably
still have, official items that you would not expect.
--
J. P. Gilliver. UMRA: 1960/<1985 MB++G()AL-IS-Ch++(p)***@T+H+Sh0!:`)DNAf
Paxman, the man who has never used one sneer when three would do
- Elizabeth Day, RT 2015/5/2-8