NPX2 + Mimosa C5C · 54–58 km · Guaymas

NPX2 with Mimosa C5C

Good alignment makes a difference

In the city of Guaymas, Sonora, the neighboring port of San Carlos sought to obtain more Mbps for the residents of the area as well as improve telecommunications for the port's operations since the current services cannot offer stable Mbps due to the distance from the main cities in addition to the copper infrastructure that is already insufficient for a growing city. Therefore, the integrator opted to create a 5 Ghz and 6 Ghz link with NPX2 antennas with C5C radios where, although there are very Good quantity of WISP, the quality of the services is not optimal. This link consists of a trunk from Hermosillo, Sonora that is joined as a redundant service but the level of interference is not comparable to the large cities of Mexico, adding a coastal area there are degradations of the links as we can see in the spectrum of this trunk.

Installer recommendations

• Alignment and fine adjustment: The installer mentions that the best way to reach the central lobe of the antenna is to use the Ubiquiti brand Rocket M5 radio at maximum power at frequency 5800 and channel width 20 MHz and fine-tune with 10 MHz.
• Calculate the power of the radios vs distance and frequency: Although it seems like something that is done from the beginning of the study, the real noise levels must be reviewed to have the lowest dBi request.
• Tape the Jumpers or Pigtails well: It is not a secret that you must tape from the beginning of the dipole to the connector to avoid leaks.
• Use thicker towers or upgrade to stronger models like Z35 or Z45.
• Do not install the antenna on a tower: The installer states that if you want to have stability in the link in a windy area, you must install it on an arm to avoid vibrations of the tower.
• Install the ARNP2 RF shield or use NPX if you have many towers around.

Integrator comments

For links of this type, it is not necessary to have the 80 MHz channels working, but it is necessary to ensure good alignment to avoid damaging the secondary lobes of the antenna. The antenna is of good quality, light, and above all, accessories such as windbreak radomes and anti-noise can be implemented. For those who say that the armatures are useless, they are wrong because they must evaluate the modulation of their radio vs. the quality of the signal emanating from their antenna before and after, which can be validated in the chains of both links.