All Forums  GQ Electronics Forums  2.GQ Geiger Muller Counter  GMC-200 at 13 months outdoors

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Screensize: 640 x 480 800 x 600 1024 x 768 1280 x 1024 UserName: Password: Format Mode: Basic  Help  Prompt  Format: Font Andale Mono Arial Arial Black Book Antiqua Century Gothic Comic Sans MS Courier New Georgia Impact Lucida Console Script MT Bold Stencil Tahoma Times New Roman Trebuchet MS Verdana   Size 1 2 3 4 5 6   Color Black Red Yellow Pink Green Orange Purple Blue Beige Brown Teal Navy Maroon LimeGreen Message: * HTML is OFF * Forum Code is ON Smilies [quote][i]Originally posted by Craig[/i] [br]Here are images of my fixed outdoor monitoring station (that coffee can with a funnel rain hat), my mobile station^, and a sample of the graphs that I post every few days to "RadViews". * The only change I made to the GMC-200 was to put a diode in series with the battery (so it can't be charged), then I installed a 4-year shelf life, ordinary 9v Alkaline backup battery instead. [b]Image Insert:[/b][br][img]http://www.gqelectronicsllc.com/forum/uploaded/Craig/2014123124516_sample1.gif[/img][br][size=1] 120.02 KB[/size=1] * That fixed station is out in the middle of our yard and uses a GMC-200, which has been running consistently and reliably for over a year. It's inside a sealed "freezer" Ziploc bag with a packet of silicon-gel desiccant --which is inside that coffee can (now painted white to minimize the Sun's heat). *^ I had to run 80 feet of Cat-3 cable to it (Cat-5 would be better) which I pulled through sealed PVC pipe for the underground portion. This powers the GMC-200 and feeds back audio pulses --which go to the comes-with pulse-to-USB adapter cable. (The run tests good to 5000cpm.) ^ If an affordable, battery powered Geiger counter --with an adjustable timed count display feature-- had been available, I wouldn't have had to dig in that cable and pipe --or even concern myself with computer and software to log the daily count. ^ Nor would it have been necessary to retrofit a broken Medcom "Inspector" with an SBM-20 G-M tube in order to have a decent mobile station (with a timed count). Craig [/quote]    Insert an Image File Check here to include your profile signature.