OVER-THE-AIR RADIO WAVEFORM ANALYZER
DIAGNOSTX AFC METER PRODUCT INFORMATION
Most LMR radios incorporate an embedded technology that aids the radio in adjusting frequency misalignment or frequency error. This temporary correction is known as Automatic Frequency Control (AFC) or Automatic Fine Tuning (AFT).
LocusUSA has developed a patented technology to determine how much AFC correction is being applied to a subscriber radio in real time while the radio is deployed in the field. The DiagnostX™ AFC Meter measures the temporary AFC adjustment by capturing and analyzing all control channel transmissions from the radio.
Radios have their own oscillator sources which drift over time. These crystals are directly impacted by the voltages applied to them which make them resonate. These controlling voltages are affected by aging of electronics, battery power, temperature, environment and mounting conditions. The effect of these variables can be seen in the drift or detuning of oscillators which contribute to the degradation of communication devices. This is where AFC is useful because it can temporarily control and correct the oscillator drift of the radio until it is turned off. AFC attempts to correct for these variables, within limits, masking a hidden problem until total communication failure occurs.
DiagnostX provides an evaluation of the radio based on specific metrics including Frequency Error. Sometimes a radio will show as being within spec according to pre-set DiagnostX thresholds. The DiagnostX AFC Meter will display what percentage of AFC is being engaged. This means that there is a temporary correction of Frequency Error of up to 1000 or 1500 Hz depending on the manufacturer. A radio that is extensively misaligned will experience issues connecting to the system. As the radio continues to drift further out of alignment AFC will no longer engage resulting in a hard failure. A radio like this, even while temporarily appearing to be within spec, is a definite candidate for maintenance. The DiagnostX AFC Meter, the only tool available for identifying such radios, provides a report of the percentage of AFC engaged on all measured subscribers, listed by Radio ID. The DiagnostX AFC Meter is an add-on feature to the DX-2002 series.
ABOUT THE DX-2002 SERIES
The DX-2002 DiagnostX over-the-air (OTA) radio analyzer identifies, verifies and analyzes the alignment and field performance of all portable and mobile radios in a network 24/7 without user interaction while the radios are operational and deployed in the field.