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 2.GQ Geiger Muller Counter
 External GM Tube

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T O P I C    R E V I E W
KK4NEF Posted - 10/16/2017 : 10:53:58
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.
4   L A T E S T    R E P L I E S    (Newest First)
flukeguy Posted - 10/18/2017 : 09:03:32
Hi Mike,
I just leave both tubes hooked up. I'm sure that the background readings are an approximate sum of both tubes.

--Terry
the_mike Posted - 10/18/2017 : 08:43:49
Hi Terry

are you using both tubes at once, or can you switch the tubes?
ullix Posted - 10/17/2017 : 05:01:14
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.
flukeguy Posted - 10/16/2017 : 13:38:28
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

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--Terry

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