Loader Settings; Loader Filter Settings - CalAmp Guardian User Manual

Serial radio modem

Hide thumbs Also See for Guardian:

Table of Contents

5.9.2 LOADER SETTINGS

The Loader Settings are used to control various options available on the Guardian when configured in Loader Mode.

Enable 600 Ohm Input

Selects whether the Rx Audio input has a 600 ohm impedance. The default value for this option is Disabled

(Unchecked).

Squelch / Carrier Controlled Mute

This option will mute the Guardian's audio output when there is no valid RF carrier signal. A valid RF carrier signal is

determined by the Carrier Detect on setting that is programmed with the slider. The default value is Disabled

(Unchecked).

Inverted PTT

Selects between Active High or Active Low input for PTT (Transmitting). If selected PTT signal is Active High. Default

value is Active Low (unchecked).

Rx-Only Radio

The Rx Only Radio option disables the radio's transmitter and any ability for the Guardian to transmit.

Inverted Carrier Detect

Select for Active Low output for Carrier Detect (if programmed in User Port Configuration). Default value is Active High

(unchecked).

Dynamic Carrier Detect OFF Threshold

Allows for the Modem to automatically adjust the Carrier Detect Off Threshold based on the RSSI while receiving data.

If selected, the Carrier Detect Off level will automatically adjust to about 15 dB below the actual signal strength. This

provides very fast detection of loss-of-carrier, which minimizes or eliminates "bit dribble" at the end of transmissions.

Recommendation: Leave this setting enabled (checked) unless interference or variable signal strength (such as fading in

a moving vehicle) causes problems.

Carrier Detect On (Slider)

Adjust the slider to set the Carrier Detect On Threshold. This is the Receive Signal Strength Indicator (RSSI) level that

the Guardian will recognize as a valid carrier signal. When the signal reaches the programmed threshold the Guardian

will begin decoding data.

The Guardian Filter Settings allow the user to adjust the Rx and Tx Filter type.

FSK: Flat Response (100 - 3300 Hz).

Inverted FSK: Inverted Flat Response (100 - 3300 Hz).

Audio: Audio Response (300 - 3300 Hz). De-emphasis is applied.

Inverted Audio: Inverted Audio Response (300 - 3300 Hz). De-emphasis is applied.

Guardian™ Serial Modem or Analog Radio for Licensed Spectrum PN 001-5006-000 Rev. 3

| Page 39

Table of Contents