I get 240 +- 2v here in Bracknell in Berkshire. 73 de M0XDF, K3 #174, P3 #108 -- No sensible decision can be made any longer without taking into account not only the world as it is, but the world as it will be. -Isaac Asimov, scientist and writer (1920-1992)
On 6 Feb 2011, at 09:36, David Cutter wrote: > I can't speak for other countries, but here in the UK I used 240V +-7% > (223V to 257V) for normal service but for brown to peak I used 240V +-10% > (216 to 264V), which is very rarely seen here. The 264V is used to test > safety trips and the like according to British Standards such as the the > generic BS3456. Factoring Europe into the equation, I reduce the lower band > to 198V (220 - 10%), so, my designs covered 198 to 264V for safe and > reliable operation. In practice, the lower end often extended to 186V > (-15%). This puts quite a burden on dissipating heat at the top end when > using linear supplies, but is the penalty when designing for extremes if > switchmode cannot be used. Hence tapped transformers to cope with local > supplies. > > Being aware of this, I have always been wary of generators when /P or > dxpeditioning and with valve linears getting the heater voltage right with a > true rms voltmeter has always been a concern for me. Small generators often > produce more of a triangular waveform and are poorly regulated well beyond > +-10% key up to key down. With a transistor linear I am concerned about the > peak of the triangle which is higher than that of a sinewave of the same rms > voltage, so, component ratings are very important. On full load, the > problem is distortion as the incoming voltage drops. Some generators also > slow down, increasing the ripple triangle and current into the reservoir > caps. > > David > G3UNA > My previous email on this didn't appear on the list, perhaps stuck in > cyberspace. > > > snip from Juergen > > > Hi Albert > > The old standard of 220,230,240 volts +- 10% has been gradually > deteriorating to plus minus anything! > > The mains voltages in many places now goes up to and regularly runs at 260 > volts! The global de-regulation and privatization of power assets globally > has seen standards go down the drain everywhere. > > Most quality switch mode power supplies are designed for voltages as high > as 260 high volts with a plus 5% rating. Many designers and export countries > have not caught up with the global deregulation of mains voltage standards. > In many places this has been allowed to happen in the hope that a global > standard will develop. > . > > 73 > John > > > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[email protected] > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
