RFINPUTGAIN

Configure the Calibrated Antenna Gain (CAG)

Platform:

OEM719, OEM729, OEM7500, OEM7600, OEM7700, OEM7720, PwrPak7, CPT7, CPT7700

Use this command to select the mode (AUTO or MANUAL) of setting the CAG for the purpose of interference detection.

If auto mode is used, the receiver will automatically compute the CAG at start up. In this case it is assumed that the receiver is powered up with its antenna connected and no interference is present.

If the antenna is changed, either reset the receiver or reissue this command to allow receiver to re-compute the CAG.

If manual mode is used, the CAG input by the user is used by the receiver to detect interference.

The CAG is defined to be the cascaded RF gain before receiver input plus LNA noise figure (NF), counting active antenna LNA gain, in-line amplifier, RF cable or distribution loss prior to receiver input connector.

A typical GNSS active antenna (of reasonable quality) has a noise figure of ~2dB (dominated by the LNA in an active antenna).

RFINPUTGAIN = Cascaded Gain before receiver + LNA NF

For advanced users.
If using this command in manual mode, the antenna gain must be accurately measured when the system is not experiencing any interference. If an erroneous CAG is injected, the interference detection performance can be degraded.

Message ID: 1658

Abbreviated ASCII Syntax:

RFINPUTGAIN RFPath [mode] [CAG]

Factory Default:

RFINPUTGAIN L1 AUTO

RFINPUTGAIN L2 AUTO

RFINPUTGAIN L5 AUTO

ASCII Example:

RFINPUTGAIN L1 MANUAL 30

RFINPUTGAIN L2 30

Field

Field Type

ASCII Value

Binary Value

Description

Format

Binary Bytes

Binary Offset

1

Command header

-

-

RFINPUTGAIN header

This field contains the command name for abbreviated ASCII or the message header for ASCII or Binary.

-

H

0

2

RFPath

L1

2

RF path selection

Enum

4

H

L2

3

L5

5

3

mode

AUTO

0

Calibrated Antenna Gain (CAG) mode.

Default = MANUAL

Enum

4

H+4

MANUAL

1

4

CAG

0.0-100.0

Calibrated Antenna Gain value

If the mode is MANUAL, a value for CAG must be entered.

Float

4

H+8

RF Paths for OEM7 Receivers

RF Path

OEM719, OEM729,
OEM7700, PwrPak7,
CPT7700, SMART7

OEM7720,
PwrPak7D, CPT7

OEM7500,
SMART2

OEM7600

L1

GPS L1

GLONASS L1

Galileo E1

BDS B1

QZSS L1

SBAS L1

 

GPS L1

GLONASS L1

Galileo E1

BDS B1

QZSS L1

SBAS L1

 

GPS L1

GLONASS L1

Galileo E1

BDS B1

QZSS L1

SBAS L1

LBand

GPS L1

GLONASS L1

Galileo E1

BDS B1

QZSS L1

SBAS L1

 

L2

GPS L2

GLONASS L2

Galileo E6

BDS B3

QZSS L2/L6

 

 

GPS L2/L5

GLONASS L2/L3

Galileo E5

BDS B2

QZSS L2/L5

NavIC L5

SBAS L5

GPS L2/L5

GLONASS L2/L3

Galileo E5

BDS B2

QZSS L2/L5

NavIC L5

SBAS L5

GPS L2/L5

GLONASS L2/L3

Galileo E5

BDS B2

QZSS L2/L5

NavIC L5

SBAS L5

L5

GPS L5

GLONASS L3

Galileo E5

BDS B2

QZSS L5

NavIC L5

SBAS L5

 

 

 

LBAND

LBand

LBand

 

LBand