User's Manual

Setting Up the Carrier Threshold

Configuration and Operation 5-11

DHX=N<Enter>

To setup the Reader’s carrier threshold, do the following:

1. Switch off the excitation field, by typing:

C<Enter>

2. Set the Receiver’s signal-to-noise ratio, by typing:

RSS=10<Enter>

Note You can set other values for the RSS parameter. Lyngsoe recommends using a value between 10

and 20 for the

RSS parameter.

3. If you are using Diversity, enable it by typing:

HAD=Y<Enter>

Ensure that both UHF antennas are connected. If you are not using Diversity, disable it by

typing:

HAD=N<Enter>

Ensure that only the right UHF antenna is selected (see the HAS parameter).

4. Check the noise level on the UHF channel, by typing:

HNL<Enter>

The HNL value should be between -107 to -95dBm.

If the HNL value is higher than -95dBm, check if there are unwanted transmissions on the

UHF channel (433.9 MHz). Pay special attention to Transponders or Exciters in close

proximity to the Reader; these can accidentally transmit data that can be received by the

Reader.

If the HNL value is lower than -105dBm, check its value without the UHF antennas attached.

The difference between these two readings must be greater than 3dB.

5. Set the carrier threshold, by typing:

S <Enter>

:CONFIG:THRESHOLD<Enter>

Note If the Reader resets itself, repeat the procedure from Step 1.

6. Monitor the DATA LED for at least 10 seconds. The LED must not flicker. If it does flicker

occasionally, increment the

RSS parameter value by one. Go to Step 5.