The Panalyzor, Model SB-12b, is an automatic scanning superheterodyne receiver which permits analysis and identification of one or many radio- frequency signals at one time. Each signal within the band being scanned is displayed on a cathode-ray tube as one of a series of inverted V’s or “pips”. The pip amplitude and position along the calibrated horizontal axis are indicative of signal level and frequency, respectively. A CW signal produces a single pip. Modulated signals (AM, FM or pulsed) cause a series of pips which indicate sideband distribution and levels. The Model SB-12b provides two modes of operation divided into seven ranges. The variable sweep width mode of operation provides a 0 - 100 KC variable sweep width for search and preliminary analysis and a 0 - 2 KC variable sweep width with automatic frequency controlled sweep for detailed analysis. The pre-set mode of operation provides pre-set, narrow band, sweep widths of 14 KC, 7 KC, 3.5 KC, 500 cps and 150 cps for slow speed, highly resolved analysis. The 2 KC, 500 cps and 150 cps sweep widths are AFC stabilized. The Model SB-12b provides visual means of examining the effects of power supply fluctuations, thermal changes, humidity, component variations, shock, vibration and load changes upon frequency. Both magnitude and direction of frequency drift are indicated. Parasitic oscillations which normally may pass unnoticed can quickly be detected and identified. Spurious modulation by subsonics, hum and noise are readily spotted. In single sideband linearity tests, the Model SB-12b permits in-band intermodulation distortion readings to -60 db. Because of its Panoramic presentation the instrument is invaluable for monitoring a frequency band for the appearance, disappearance and shift of signals. Highly useful graphic displays of such phenomena as Bessel function distributions of f-m signals, energy distribution of pulsed r-f signals with low p.r.f.’s, a-m sidebands, etc., can be obtained. The SB-12b is unique in that it offers all the advantages of automatically scanning spectrum presentations, yet enables examination of signals so closely adjacent in frequency that their corresponding deflections normally tend to merge together or even completely mask one another even with static wave analyzers. This instrument can, at reduced sw’eep widths and slow sweep rates, resolve equal amplitude signals down to 10 cps separation. Signals with an amplitude ratio of 60 db separated by 60 cps are clearly separated.