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Sl1200 Soldering Guidelines

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SL1200 Soldering Guidelines Introduction This document details the recommended soldering instructions for the SL1200 antenna to ensure that no mechanical stress is put on to the connection pins which can cause damage to the antenna. Recommended Equipment Figure1: Either a Pace or Weller soldering station (as shown). Use a fine tip on the iron, we recommend 0.8-1.0mm 30deg tip Figure 2: Soldering iron tip Figure 3: Solder: Almit SR-37 Pb-Free Sarantel LTD SL1200 Soldering Guidelines Page 1 Jigging and Assembly Procedure It is recommend that a jig is used to correctly position the antenna at 90 degrees with respect to the PCB and to ensure correct alignment of the antenna pins with the pads on the PCB. An example of a jig is shown below fabricated from a plastic such as Acetal. Jig for supporting the antenna and PCB 1. The antenna is inserted in to the pocket in the jig so it correctly lines up with the pads on the PCB and is held in place with respect to the edge of the PCB. Sarantel LTD SL1200 Soldering Guidelines Page 2 2. The antenna pins are aligned with the pads on the PCB. Ensure PCB is pushed up against the capacitor stand-offs Align the feed pins over a lightly tinned solder pads 3. The outer ground pins are soldered in to place first. 4. Finally, the inner signal pin is soldered in to place. Because the signal pin is not on a level plane with the ground pins it tends to sit slightly proud of the signal pad. If you push it down towards the pad during soldering it can cause failure at the bga end. Sarantel LTD SL1200 Soldering Guidelines Page 3 Temperature Profile We recommend that the soldering iron temperature is set to 430 degsC and that this is applied to the pins for a max of 10 secs. With a 0.8mm tip there is a reasonable amount of thermal resistance so it’s not unreasonable to increase the temperature to a maximum of 450 degsC due to wear. However, ensure that the soldering time is not increased. Note: A reflow process was used in the manufacture of this antenna and the necessary corrections and tuning of the antenna to optimise performance were performed. It is not possible to further temperature reflow this product during assembly into devices. ONLY hand soldering is recommended with the above mentioned characteristics. Summary Utilising a jig ensures correct alignment of the antenna to the PCB and also minimises the risk of mechanical stresses being applied to the antenna during the soldering process. Sarantel LTD SL1200 Soldering Guidelines Page 4