SB-620 Scanalyzer ------------------- The Heathkit SB-620 gives a visual display of signal amplitude versus frequency along the calibrated horizontal axis on a high persistance CRT. Signals within the band being scanned are displayed as a series of inverted V's called "pips." The SB-620 can be used as a spectrum monitor to scan wide bands of frequencies for the presence of signals or for clear frequencies. It may also be used as a test instrument to provide high resolution signal analysis. The pips may be represented on the CRT with either a linear or logarithmic scale. Signals as far apart as 40 db (100:1) in amplitude may be viewed simultaneously with a logarithmic presentation. Both variable and fixed sweep widths are provided. The variable sweep mode provides up to 500 kHz of band width presentation (150 kHz max when wired for 455 kHz IF systems). The 10 kHz and 50 kHz fixed, narrow-band sweep widths permit slow speed, high resolution signal analysis. At these reduced sweep widths and slow sweep rates, it can resolve equal amplitude signals down to 1 kHz separation. Because it gives a panoramic presentation when connected to the IF system of a receiver, the SB-620 is invaluable for monitoring a wide frequency band for the appearance, disappearance and shift of signals. Yet, when it is placed in the 10 kHz or 50 kHz sweep modes, it enables you to examine so closely adjacent in frequency that their corresponding deflections normally tend to merge together or even completely mask on another. With the SB-620, you will be able to visually monitor the portion of the band that is centered around the frequency you have tuned on your receiver. For example, you may see clear frequency areas in a crowded band, or signals that appear on a seldom used band. It is possible to identify the type of transmissions: SSB, AM, CW, etc. The SB-620 may be used to provide a visual check for out-of-band operation (when used with a calibrator), to aid in locating spurious transmitter radiation, for carrier null adjustments, and for measuring unwanted sideband. You may also examine and analyze signals of frequencies other than those for which the SB-620 input has been wired for by using the input stage as a mixer. When set up in this manner, the SB-620 provides a visual means of examining such things as the intermodulation distortion products of a single sideband signal. SPECIFICATIONS -------------- RF AMPLIFIER ------------ Input Frequencies (Receiver IF). . . . One of the following: 455 kHz, 1000 kHz, 1600 to 1680 kHz, 2075 kHz, 2215 kHz, 2445 kHz, 3000 kHz, 3055 kHz, 3395 kHz, 5200 to 6000 kHz. Frequency Response. . . . . . . . . . . +-0.5 dB at +-50 kHz from receiver IF. IF Frequency. . . . . . . . . . . . . . 350 kHz. Sensitivity . . . . . . . . . . . . . . Approximately 10 uv input signal provides a visible signal (40 dB mark) at full pip gain setting. Spectrum Analyzer . . . . . . . . . . . Test signal input frequencies up to 50 MHz. HORIZONTAL DEFLECTION --------------------- Horizontal Sweep Generator. . . . . . . Sawtooth sweep produced by neon lamp relaxation oscillator. Sweep Rate (Approximate Frequencies). . 10 kHz preset: 0.5 Hz, 50 kHz preset: 2 Hz to 2.5 Hz. Variable: 5 Hz to 15 Hz. Preset Sweep Width 10 kHz preset: 10 kHz. 50 kHz preset: 50 kHz. Variable Sweep Width*, , . . . . . . . . IF SWEEP WIDTH -- ----------- 455 kHz 10 kHz to 100 kHz 1000 kHz 50 kHz to 500 kHz 1600 kHz 50 kHz to 500 kHz 1680 kHz 50 kHz to 500 kHz 2075 kHz 50 kHz to 500 kHz 2215 kHz 50 kHz to 500 kHz 2445 kHz 50 kHz to 500 kHz 3000 kHz 100 kHz to 500 kHz 3055 kHz 100 kHz to 500 kHz 3395 kHz 100 kHz to 500 kHz 5200 kHz 100 kHz to 500 kHz 6000 kHz 100 kHz to 500 kHz *These sweep widths are minimum values. Actual sweep width ranges will be greater than those listed, depending on the receiver IF frequency for which unit is wired. Resolution. . . . . . . . . . . . . . . 1 kHz. NOTE: Resolution is defined as the frequency separation between two equal adjacent signals such that the intersection between their respective pip indications is 30% below the apex amplitude. Amplitude Scales. . . . . . . . . . . . Linear: 20 dB (10:1) range. Log: 40 dB (100:1) range. -20 dB Log: (Extends calibrated range to 6OdB) POWER SUPPLY ------------ Type. . . . . . . . . . . . . . . . . . Transformer operated; fused at 1/2 ampere. Low Voltage . . . . . . . . . . . . . . Full-wave voltage doubler circuit, using four silicon diodes. High Voltage. . . . . . . . . . . . . . Full-wave voltage doubler circuit using two selenium diodes. Bias Voltage. . . . . . . . . . . . . . Full-wave bridge circuit, using four silicon diodes. Power Requirements. . . . . . . . . . . 120 or 240 volts AC, 50/60 Hz, 40 watts. GENERAL ------- Tube Complement . . . . . . . . . . . . 1 - 3RP7 CRT, high persistence (yellow trace with screen filter). 1 - 6AT6, detector vertical amplifier. 1 - 6AU6, IF Log amplifier. 1 - 6EA8, sweep oscillator, mixer. 1 - 6EW6, RF amplifier. 1 - 6EW6, IF amplifier. 1 - 12AU7, horizontal, push-pull amplifier. Diode Complement. . . . . . . . . . . . 8 - Silicon diodes, low voltage rectifier, DC filament rectifier. 2 - Selenium diodes, high voltage rectifiers. 1 - Silicon diode, voltage-variable capacitor. Cabinet Dimensions. . . . . . . . . . . 6-5/81" high x 10" wide x 10-1/2" deep. Net Weight. . . . . . . . . . . . . . . 10 lbs. (Data taken from Heathkit SB-620 manual by KB7RGG)