no they're not well standardized..... i've seen yellow and orange and blue in the stereo decoders for older FM receivers there are also a few different methods of demodulating FM. the most common up until about 1980 was a discriminator. discriminators used either two identical IF cans, or a single can with two cores and the two cores or cans were stagger tuned 50 or 75 khz from the center frequency. around 1980 or so, PLL demods began to appear. they used a 10.7Mhz VCO, a phase detector, and a loop filter.. the 10.7Mhz VCO had a single can with an adjustable core. the loop filter was disconnected and a frequency counter connected to the VCO output, and the coil (or in cheaper versions, variable cap) adjusted for 10.7Mhz, then the loop filter was reconnected. the control voltage coming out of the loop filter was the source of demodulated audio. by this time stereo decoders had already become exclusively PLL operated de-muxers with inductor-less oscillators, so coils were no longer required for them. a weather radio doesn't have a stereo decoder, but can have an audio PLL for tone encoded aquelch for emergency alerts. this PLL probably has an adjustment pot, and if the 10.7Mhz demod is a PLL type, can have an adjustable coil or a variable cap