J-F2,000X-DK Navman Wireless, J-F2,000X-DK Datasheet - Page 20

• Manufacturer Part Number: J-F2,000X-DK
• Description: EVAL KIT GPS JUPITER 2
• Manufacturer: Navman Wireless
• Series: -r
• Type: Receiver, GPSr

Specifications of J-F2,000X-DK

• Frequency: 1575.42MHz
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• For Use With/related Products: Jupiter 2
• Other names: 943-1013

Setting the IC Configuration
The Jupiter-F
is ideal for passive antenna applications, while the low gain mode is ideal for active antenna
applications.
The development kit hardware is set up to use an active antenna. The antenna feed is outputting 3.3V
for the antenna. To ensure that no cross-correlation occurs, ensure that the correct LNA gain setting is
selected for the chosen GPS antenna for use. In this case, the provided GPS antenna, the M820B-S, has
16dB typical gain.
Chapter 4
aware of the correct parameter changes so as not to render your receiver non-operational.
1. On the Main Menu Bar, select “Receiver” > “Command” > “IC Configure. . .”
2. Click on “Advanced. . .” to open the IC Configuration fields.
3. Click “Yes” to proceed.
4. Under the selection “LNA Gain Mode:” choose “Low” from the drop down menu. Choosing Low
will configure the internal LNA to its low gain mode. This will make the Evaluation Kit better
fitted to work with an active antenna. Figure 14 displays the IC Configuration window.
A message will pop up warning about incorrectly configuring the IC parameters. Ensure that you are
Jupiter-F
2
module has two LNA modes, a high gain mode, and a low gain mode. The high gain mode
2
on SiRFLive
Table 1: LNA information and antenna gain requirements
20