EMFields Measuring Equipment - Microwave Acousti-Com Monitor
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The Acousti-COM MonitorThe A-COM turns the pulsing radiation from cordless phones, mobile phones and other microwave sources into an audible sound, the level of which varies depending on how exposed it is to the radiation. It also picks up the emissions from 2G, 3G and TETRA masts. To hire: £25 per week (please telephone +44 (0)1353 778814 to arrange). HIRE this together with the COM monitor, and save £10.00 on the price of hiring them separately |
Microwave A-COM (Acousti-COM) Monitor - Further Information
Technical specifications
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Mobile phone base stations are springing up all over the place, often with very little warning of their arrival. For those concerned about the radiofrequency electromagnetic fields in their houses, workplaces and schools, you can purchase or hire an Acousti-COM to measure the typical exposures of yourself and your family.
The Acousti-COM monitor allows you to hear the "aggressive pulsing" of microwave signals from mobile phone base stations (including TETRA and 3G), DECT cordless phones, mobile phones, microwave baby monitors, microwave burglar alarms, Bluetooth devices, wireless computer and laptop systems, etc. (50MHz - 6000MHz). With a sensitivity of 0.03 V/m, the A-COM is much more sensitive than the COM monitor. In areas free of low-frequency amplitude pulsing microwaves the Acousti-COM emits a gentle "background hiss".
Example sound files
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When microwaves are pulsing up and down in level, you can hear these changes up to about 10 kHz as a high pitched whine. The A-COM does not have an RF gain stage (as that could make it misleadingly sensitive) and simply rectifies any pulsing microwave signals that are hitting the A-COM and your body. It then amplifies any signals in the audio range so that you can hear them. You can also hear a "swish" as any rotating airport or naval radar beam sweep by.
GSM base stations emit a harsh sounding 1733 Hz high pitched whistle (full of high frequency signals due to the short 30 microsecond gaps between the pulses) from the base control carrier (BCCH), and a mixture of 217 Hz plus harmonics from the traffic channel(s) with very low frequency bursts and interruptions. The advantage of converting the signals to audio (as opposed to a numeric display) is that it allows you to differentiate between the different signals that your body is exposes to.
UMTS (3G) base stations emit a 1,500 Hz high-pitched whistle and a mixture of complex modulation (heard as sounds on the A-COM) in the 2,000 - 20,000 Hz range. This is dependent on people making phone calls and the level can vary from very low to very high, depending on the number of calls being made at that time.
DECT cordless phones and their base units emit a 100Hz pulsing (plus higher frequencies due to the sharp sides of the pulses); the base units do this 24 hours a day even when you are not using the phone! You can tell which houses have DECT phones by walking past them holding the A-COM monitor.
Wireless LANs used to network computers and sometimes to connect to broadband internet emit their radiation in short bursts. These are heard as a scratchy pulsing/clicking noise on the A-COM which varies from a few clicks per second to an almost continuous clattering sound.
You can also hear the 50 and 100 Hz pulsing from microwave ovens and the 17 and 70 Hz pulsing from TETRA base stations.
The A-COM does not react to power-frequency sources of EMFs, nor does it react to fluorescent lights further than at a few inches distance.