XPost: rec.radio.shortwave   
   From: spam@spam.com   
      
   On Sat, 12 Nov 2011 23:42:22 -0800, John Smith    
   wrote:   
      
   >On 11/12/2011 11:12 PM, Don Pearce wrote:   
   >> On Sat, 12 Nov 2011 17:24:02 -0800 (PST), arthrnyork@webtv.net wrote:   
   >>   
   >>> On Nov 12, 2:44 pm, John Smith  wrote:   
   >>>> On 11/11/2011 10:10 PM, RHF wrote:   
   >>>>   
   >>>>> ...   
   >>>>> -wrt- Faraday Cage :   
   >>>>> Old Metal {Steel} Garbage Can with a   
   >>>>> tight fitting Lid.  -store-holding-   
   >>>>> + The Solid State AM/FM/SW Radio   
   >>>>> + Plenty of Batteries   
   >>>>> -or- Re-Chargeable Batteries and a   
   >>>>> Solar Charger   
   >>>>   
   >>>>> -no-tubes-required- ~ RHF   
   >>>>>    .   
   >>>>   
   >>>> Satellites are withstanding these on an almost daily basis, for years,   
   >>>> if not decades ... doesn't seem to be a real problem anymore ...   
   >>>> however, laying hands to that technology might be a bit of a different   
   >>>> story ... as, while one nation might wants its' own satellites hardened,   
   >>>> it certainly doesn't want the enemies ...   
   >>>>   
   >>>> Regards,   
   >>>> JS   
   >>>   
   >>> As far as I know- none of the satellites are using vacuum tubes .   
   >>> That's the reality .   
   >>   
   >> Dream on. Just about every satellite in the sky uses vacuum tubes. The   
   >> TWT (travelling wave tube) is still the way to generate high, reliable   
   >> power for space-borne transmitters.   
   >>   
   >> d   
   >   
   >They would be fools to attempt to boost the weight and fragility of   
   >vacuum tubes into space, if they have any other alternative ... high   
   >power is easily handled with the modern transistors ... the energy   
   >requirements of the heaters is also another no-go ...   
   >   
   >Regards,   
   >JS   
      
   Energy requirements are not a problem, and neither is G-loading on   
   takeoff. You are inventing problems where none need exist. TWTs are   
   mega-reliable devices with a very predictable life curve.   
      
   It is much more important to know exactly how long and how well your   
   satellite is going to work than to hope to get longer by using a   
   technology that might last longer, but will more probably die   
   unexpectedly when struck by a cosmic ray burst.   
      
   d   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)