Now replaced with GS_USB-PRO

The GS-1100-PRO was the second generation GS, it has been a great workhorse, with over 1000 units sold, but has now been superseded by the new GS-USB-PRO .

I still have parts left to make the GS-1100-PRO and I can still make these to order if anyone wants it,  but I strongly recommend potential buyer to consider the new model.

GS-1100-PRO Technical Specifications   
Input Power (USB) + 5V
Current Draw < 200 ma
Output Bias Voltage (smooth potentiometer) 0V to 1100V
Output Signal (Audio Line Level) + 0 - 2500mV
Pulse length 100 µs
Preamp Gain (adjustable trim pot on bord) set to ~10%
Ripple < 1 mV
Voltage Drift <1:1000V
High Voltage Connector BNC
Signal in Connector SMA
Audio Out Connector Mono jack


1 x USB Cable

1 x 3.5 mm mono jack cable

1 x SMA to BNC Cable

1 x Quick Setup Manual

Gamma spectacular outputs an audio signal proportional to the input pulse energy, and is designed to work with sound card spectroscopy software, utilizing the analog to digital capabilities of modern computers.

This unit does not come with a radiation detector. For basic radiation activity measurements, it will work with most GM tubes or pancake detectors, and for Gamma spectroscopy it will work best with NaI scintillation detectors coupled for positive voltage. Please feel free to send us the make and model number of your radiation detector, to confirm suitability.

Any computer with a sound card and mic/line in audio jack port will work. The recommended software is for PC, but it will work perfectly on Mac OS-X with Crossover by CodeWeavers

There are several great programs available for sound card spectrometry, and most of them are FREE, please see our software download section for the program that suits your need here.

Still have questions? .......... Contact us


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GS-1100-PRO (Discontinued)

  • Product Code: GS-1100-PRO
  • Availability: Pre-Order
  • USD $399.00

Tags: gammaspectacular, GS-1100-PRO, multichannel analyser, MCA, USB MCA

Purchasing information

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Student Discounts

We gladly offer full time students and amateur fusioneers a once off A$50 student discount on orders over $300, the discount is a self serve, honour system, so if you are very young or very old, and don't have a full time job or lot's of money, you simply type the word student into the coupon code field when you place your order. * To redeem a student coupong, you need to create an account and log in.

Educational Institutions

Talk to us about classroom bulk purchases, why share one spectroscopy system per class, when you can have one on every workbench. We can offer formal quotations by request and are happy to cooperate with government or institutional procurement teams. Please use contact us for a quote.