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 2.GQ Geiger Muller Counter
 External GM Tube
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KK4NEF

USA
1 Posts

Posted - 10/16/2017 :  10:53:58  Show Profile  Reply with Quote
Has anyone ever modified this unit to include an exterior connector (BNC/SMA) to allow for an external GM tube or probe? Just ordered a new GMC-320+ today and thought it would be cool to add that.

Austin Jewsbury
KK4NEF
Reply #1

flukeguy

USA
13 Posts

Posted - 10/16/2017 :  13:38:28  Show Profile  Reply with Quote
I have installed an RCA phono connector as it was the shortest that I could fit in there. I then use a phono to BNC adaptor to my SBT-11 probe. Always works fine and can still use then internal tube

Image Insert:

262783 bytes

--Terry
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Reply #2

ullix

Germany
265 Posts

Posted - 10/17/2017 :  05:01:14  Show Profile  Reply with Quote
It doesn't need "high quality" cables, whatever this may mean. Even some plain lab cables will do.

But be aware of capacitance issues, as discussed here http://www.gqelectronicsllc.com/forum/topic.asp?TOPIC_ID=4598

However, unless you go for very high count rates, even poor cables, i.e. such with high capacity, will not have a big impact.

Just for capacity issues don't make the lines too long, e.g. less than 1m. If you need longer, carefully look at capacity.
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Reply #3

the_mike

Switzerland
26 Posts

Posted - 10/18/2017 :  08:43:49  Show Profile  Reply with Quote
Hi Terry

are you using both tubes at once, or can you switch the tubes?
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Reply #4

flukeguy

USA
13 Posts

Posted - 10/18/2017 :  09:03:32  Show Profile  Reply with Quote
Hi Mike,
I just leave both tubes hooked up. I'm sure that the background readings are an approximate sum of both tubes.

--Terry
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