scope:

This specification covers the requirements for tuned and untuned intermediate, radio frequency, and discriminator transformers. These inductive components may be combined with additional circuit elements such as capacitors and resistors which are functionally related to the inductive elements for the purpose of coupling, impedance conversion, and isolation.

Transformers covered by this specification shall be of the following types, grades, and classes as specified (see 3.1 and 6.1):

Type I - Intermediate frequency transformer. Type II - Radio frequency transformer. Type III - Discriminator transformer. Grade 1 - For use when immersion and moisture resistance tests (see 4.7.19 and 4.7.20) are required. Grade 2 - For use when moisture resistance test (see 4.7.20) is required. Grade 3 - For use in sealed assemblies. Class O - 85°C maximum operating temperature. Class A - 105°C maximum operating temperature. Class B - 125°C maximum operating temperature. Class C - > 125°C maximum operating temperature.

NOTE: The class denotes the maximum operating temperature (temperature rise plus maximum ambient temperature).