Ask your doctor for a vitamin D test. Be specific and ask for a 25(OH)D test. There is another type of blood test for vitamin D, called a 1,25(OH)âD test, but the 25(OH)D test is the only one that will tell you whether youâre getting enough vitamin D. Order an in-home test. These tests are sent to your home.
Carrier signal: A frequency in a communications channel modulated to carry analog or digital signal information. For example, an FM radio transmitter modulates the frequency of a carrier signal and the receiver processes the carrier signal to extract the analog information. An AM radio transmitter modulates the amplitude of a carrier signal.
The frequency of the alternating current carrier, which produces the electromagnetic waves that radiate from radio-transmitting antennae. The audio-frequency signals from the microphone modulate the carrier. It is the steady frequency of a modulated wave and is the same as that before modulation is applied.aves at the carrier frequency do not, in themselves, contain any information; they only âcarryâ the information. In addition to the carrier frequency, the spectrum of modulated waves also includes the side frequencies, which contain the information being transmitted. 1  Facebook.