We present the results of a spectral line survey from 138.3 to 150.7 GHz toward Orion-KL .
The observations were made using the 14 m radio telescope of Taeduk Radio Astronomy Observatory .
Typical system temperatures were between 500 and 700 K , with the sensitivity between 0.02 - 0.06 K in units of T _ { A } ^ { * } .

A total of 149 line spectra are detected in this survey .
Fifty lines have been previously reported , however we find 99 new detections .
Among these new lines , 32 are ‘ unidentified ’ , while 67 are from molecular transitions with known identifications .
There is no detection of H or He recombination lines .
The identified spectra are from a total of 16 molecular species and their isotopic variants .
In the range from 138.3 to 150.7 GHz , the strongest spectral line is the J= 3 - 2 transition of CS molecule , followed by transitions of the H _ { 2 } CO , CH _ { 3 } OH , CH _ { 3 } CN , and SO _ { 2 } .
Spectral lines from the large organic molecules such as CH _ { 3 } OH , CH _ { 3 } OCH _ { 3 } , HCOOCH _ { 3 } , C _ { 2 } H _ { 5 } CN and CH _ { 3 } CN are prominent ; with 80 % of the identified lines arising from transitions of these molecules .
The rotational temperatures and column densities are derived using the standard rotation diagram analysis for CH _ { 3 } OH ( ^ { 13 } CH _ { 3 } OH ) , HCOOCH _ { 3 } , CH _ { 3 } CN and SO _ { 2 } with 10 \sim 270 ~ { } K and 0.2 \sim 20 \times 10 ^ { 15 } ~ { } cm ^ { -2 } .
These estimates are fairly comparable to the values for the same molecule in other frequency regions by other studies .