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 2.GQ Geiger Muller Counter
 2nd tube in GMC500
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3 Posts

Posted - 05/26/2021 :  13:51:18  Show Profile  Reply with Quote
Hi guys, I have had a GMC500 since last year. It looks like the GMC500 has built in the same motherboard as the GMC500 +. There is a holder for the high-dose tube. Has anyone ever tried to install a SI-3BG tube in the GMC500? I think the only difference will be the firmware? Greetings from Germany, Joe
Reply #1


516 Posts

Posted - 05/26/2021 :  23:34:18  Show Profile  Reply with Quote
Hi BananaJoe
it is quite possible, but in principle the second tube is only useful for very high doses, so it is not used for much.
If you could do it, but you would need a compatible firmware with your hardware revision, other than consuming more power, it wouldn't do much.

Mastery is acquired by studying, with it everything becomes simple

Edited by - Damien68 on 05/26/2021 23:35:46
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Reply #2


602 Posts

Posted - 05/27/2021 :  02:17:26  Show Profile  Reply with Quote
... as Damien said!

While I don't know, I could imagine that GQ hasn't bothered to modify the firmware for the castrated 500. But nothing prevents you from putting in a 2nd M4011 (if that is the tube still used). This would double the sensitivity.

Power consumption is probably not an issue. Additional power is used really only on detection of a count, and you are unlikely to achive high counts.

If you have no second tube ready, try the first one. Take it out and connect it with lab cord and crocodile clamps to the holders for the second tube, and see if you can get any counts.

Just for playful among us ;-)
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