Loma IQ2 Service Manual page 15

Product Description and Environment
All Loma metal detectors are designed, and tested, to meet the requirements of the
FCC and the new stringent European regulations for RF emissions. Both in terms of
not emitting excessive or being unduly affected by emissions from other equipment
whose emissions also meet the standards?
This approach allows Loma to offer stable operation even in RF noisy environments,
provided the other equipment is to the same standards and the field wiring is suitably
'hard'.
Hand Held Walkie-Talkie Radios
Interference from UHF walkie-talkie radios operating in the carrier frequency range of
403 - 470 MHz have been increasingly problematic because they can severely interfere
with general-purpose metal detectors of all types and operating frequencies.
The interference occurs whenever the talk button is pressed or released resulting in,
on occasion, very high signal readings often in the thousands leading to false triggering
of the detector.
This effect can be eliminated by the addition of extra screening with connection filtering
for the search headboard.
The suppression system was made available as standard build on Freefall detectors
for the Americas and optional elsewhere from about March 2003.
If interference is experienced from this type of radio then contact your local service
office with details of the affected detector/s. Due to the physical size of the
modification it cannot be ordered or retrofitted for Pipeline or Pharmaceutical
detectors.
Module 5092 3-6