Maestro A2200-A Manual do Utilizador descarregar pdf (Página 15)

V1.0-Mar-14

User’s Manual

Page 15 of 43

GND

0.1µF

RS232 Level Shifter

RS232 Out

DB9 female

3.3V

Vcc

GND

T1O

R1I

R1O

T1I

T2I

R2O

C1+

V+

C1-

C2+

C2-

V-

T2O

R2I

MAX3232

GND

0.1µF

RS232 Level Shifter

RS232 Out

DB9 female

3.3V

Vcc

GND

T1O

R1I

R1O

T1I

T2I

R2O

C1+

V+

C1-

C2+

C2-

V-

T2O

R2I

MAX3232

Figure 7: RS232 level shifter

Remarks:

• Place C1 to C5 (here: 0.1µF) close to MAX3232. For capacity values see

datasheet of actual component used.

• Use 3.3V level shifter (MAX3232 or equivalent).

• External antenna input impedance is 50 Ω. Match as close as possible.

3.2 Antennas

Generally, the quality of the GPS&GLONASS antenna chosen (passive or active) is

of paramount importance for the overall sensitivity of the GPS&GLONASS system.

Losses through a bad antenna, long cables or tracks or a bad antenna position can’t

be compensated afterwards!

3.2.1 Passive Antennas

The A5100-A supports passive antennas via an integrated LNA directly.

3.2.2 Active Antennas

The A5100-A also supports active antennas directly, i.e. by offering an antenna

voltage feed pin (VANT – pin 9). It is recommended to use an active antenna with a

supply voltage of 3 to 5 VDC and a maximum current draw of 50 mA. The antenna

should have a gain ≥ 15dB but the total gain (antenna gain minus cable loss at the

antenna input of the module) should not exceed 30 dB. The noise figure should be ≤

1.5dB.

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