Solution
This issue might be happened because of the antenna location or antenna specification are not compatible with the device. You can resolve this issue by performing troubleshooting step below:
- Identify your antenna specification based on the part number. (For example: 748535-01 is 35 dB antenna)
- From the Maximum Cable Length section on page 4-5 from PXI-6683 Series User Manual and Specifications, we can learn the formula of checking the maximum cable length. For Example:
Max_cable_loss = -130 dBm + 35 dB - (-125 dBm) = 30 dB
Max_cable_length = 30 dB / (0.8 dB/m) ≈ 37.5 m
So, the maximum length of cable can be use is 37.5 m
- If the cable was compatible with the antenna but the same issue persists. User can proceed to troubleshoot the hardware:
- It might be a bad antenna. Do you have a different antenna you can test with? Or try another cable?
- What is the status of the GPS LED on the front of the 6683H? (Refer to page 3-4 from NI PXI-6683 Series User Manual )
- Where is the antenna currently positioned? And where has user tried moving it to?
- If there are high buildings or trees around, this can generate reflections that lower the signal quality.
- If user haven't done so already, try moving the antenna outside. there are several instances where end-user try to place the antenna near a window, but this isn't enough since lots of buildings act as Faraday cages.
- The antenna should have a straight line of sight to the sky in all directions (360 degrees), down to an imaginary line making a 30-degree angle with the ground.