The G-8815 is a single card, frequency shift transmitter capable of having the mark, center and space frequencies for each frequency programmed by a block of 12 switches. The G-8815 is intended as a universal spare for G-8080 section A and for most configurations of the G-7605 FS Transmitters. In using the G-8815, one should be aware of the across-the-band loading of the output stage. Adjacent channels will be loaded by the 3000 ohm output impedance of the G-8815; therefore, the signal levels of the adjacent channels may have to be adjusted by up to 10%, depending on the number of channels involved.