Note: Soldering a Radio Antenna

Objective:

To heat a coaxial antenna assembly to 600°F within 2 seconds for a soldering application. The goal to improve on an existing procedure with a soldering iron which required 10 to 15 seconds. 

End Product:

antenna

Equipment:

Ambrell 1 kW power supply, remote heat station with one 1.2 µF capacitor and a specially designed induction coil. 

Materials:

.250” diameter aluminum antenna assembly, aluminum ferrule, solder paste, temperature indicating paint

Temperature:

600°F

Frequency:

333 kHz

Testing:

Initial tests were conducted with temperature indicating paint to establish a heating profile and determine time-to-temperature. The solder paste was then applied to the antenna assembly and aluminum ferrule. RF power was applied for two seconds to heat and flow the solder joint.

Benefits:

Consistent and repeatable results were achieved within the required two-second time frame. A close examination of the solder joint indicated that the solder flowed well and  formed a good, solid joint. 

Soldering a Radio Antenna

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