SB-102 Transceiver ------------------ The SB-102 Transceiver is a compact 80 through 10 meter transmitter and receiver. It is capable of SSB and CW operation. It may also be used as an exciter for a linear amplifier. Heathkit DC (HP-13) and AC (HP-23) power supplies are available for use with this transceiver to provide both mobile and fixed-station operation. Provisions are made for both VOX and PTT operation. An anti-VOX circuit prevents the received signal at the speaker from switching the transmitter on during VOX operation. The pre-assembled, prealigned linear master oscillator (LMO) and the crystal-controlled heterodyne oscillator assure accurate, stable operation with easy alignment. The large tuning knob, and the smooth operation of the dial mechanism provide convenient, backlash=free tuning. A built-in crystal calibrator allows the dial to be accurately calibrated at 100 kc intervals. Other features include: TALC (triple action level control) to prevent overdriving the final amplifiers; tone actuated CW operation; and an S-meter that is switch-controlled in the transmit mode of operation to measure grid current, plate current, ALC voltage, relative power, and high voltage. A total of nineteen tubes and eighteen diodes are used. SPECIFICATIONS -------------- RECEIVER -------- Sensitivity. . . . . . . . . . . . . . Less than 0.35 microvolt for 10 db signal-plus-noise to noise ratio for SSB operation. SSB Selectivity. . . . . . . . . . . . 2.1 kc minimum at 6 db down, 5 kc maximum at 60 db down (3.395 mc filter). (2:1 nominal shape factor at 60:6 db.) CW Selectivity . . . . . . . . . . . . 400 Hz minimum at 6db down, 2.0kHz max at 60db down with SBA-301-2 filter installed. Input. . . . . . . . . . . . . . . . . Low impedance for unbalanced coaxial input. Output Impedance . . . . . . . . . . . 8 speaker, and high impedance headphone. Power Output . . . . . . . . . . . . . 2 watts with less than 10% distortion. Spurious Response. . . . . . . . . . . Image and IF rejection better than 50 db. Internal spurious signals below equivalent antenna input of 1 microvolt. TRANSMITTER ----------- DC Power Input . . . . . . . . . . . . SSB: (A3a emission) 180 watt P.E.P. (normal voice: continuous duty cycle). CW: (Al emission) 170 watts (50% duty cycle). RF Power Output. . . . . . . . . . . . 100 watts on 80 through 15 meters; 80 watts on 10 meters (50 ohm nonreactive load). Output Impedance . . . . . . . . . . . 50 Q to 75 ohms with less than 2:1 SWR. Oscillator Feedthrough Or Mixer Products. . 55 db below rated output. Harmonic Radiation . . . . . . . . . . 45 db below rated output. Transmit-Receive Operation . . . . . . SSB: PTT or VOX. CW: Provided by operating VOX from a keyed tone, using grid-block keying. CW Side-Tone . . . . . . . . . . . . . Internally switched to speaker or headphones, in CW mode. Approximately 1000 cps tone. Microphone Input Impedance . . . . . . High impedance with a rating of -45 to -55db. Two pin connector. Carrier Suppression. . . . . . . . . . 50 db down from single-tone output. Unwanted Sideband Suppression. . . . . 55 db down from single-tone output at 1000 cps reference. Emissions not possible or not recommended...AO, A2, A3, A3b, A4 through A9, FO through F9, and PO through P9. Third Order Distortion . . . . . . . . 30 db down from two-tone output. RF Compression (TALC*) . . . . . . . . 10 db or greater at .1 ma final grid current. GENERAL ------- Frequency Coverage . . . . . . . . . . 3.5 to 4.0; 7.0 to 7.3; 14.0 to 14.5; 21.0 to 21.5; 28.0 to 28.5; 28.5 to 29.0; 29.0 to 29.5; 29.5 to 30.0 (megacycles). Frequency Stability. . . . . . . . . . Less than 100 cps per hour after 10 minutes warmup from normal ambient conditions. Less than 100 cps for +-10% line voltage variations. Modes Of Operation . . . . . . . . . . Selectable upper or lower sideband (suppressed carrier) and CW. Visual Dial Accuracy . . . . . . . . . Within 200 cps on all bands. Electrical Dial Accuracy . . . . . . . Within 400 cps after calibration at nearest 100 kc point. Dial Mechanism Backlash. . . . . . . . Less than 50 cps. Calibration. . . . . . . . . . . . . . 100 kc crystal. Audio Frequency Response . . . . . . . 350 to 2450 cps. Phone Patch Impedance. . . . . . . . . 8 ohms receiver output to phone patch; high impedance phone patch input to transmitter. Front Panel Controls . . . . . . . . . Main (LMO) tuning dial Driver tuning and Preselector Final tuning Final loading Mic and CW Level control Mode switch Band switch Function switch Frequency control switch Meter switch RF Gain control Audio Gain control Filter switch Internal Controls. . . . . . . . . . . VOX Sensitivity VOX Delay ANTI-TRIP Carrier Null (control and capacitor) Meter Zero control CW tone volume Relative Power Adjust control Bias Phone Vol (headphone volume) Neutralizing Tube Complement. . . . . . . . . . . . 0A2 Regulator (150 V) 6HS6 RF amplifier 6AU6 Ist receiver mixer 6AU6 Isolation amplifier 6AU6 lst IF amplifier 6AU6 2nd IF amplifier 6BN8 Product detector and AVC 6CB6 2nd transmitter mixer 6CL6 Driver 6EA8 Speech Amplifier and cathode follower. 6EA8 lst transmitter mixer and crystal oscillator. 6EA8 2nd receiver mixer and relay amplifier. 6EA8 CW side-tone oscillator and amplifier. 6GW8 Audio amplifier and audio output. 12AT7 Heterodyne oscillator and cathode follower. 12AT7 VOX amplifier and calibrator oscillator. 12AU7 Sideband oscillator 6146 Final amplifiers (2) Transistor Complement. . . . . . . . . 2N3567 LMO power supply Diode Complement . . . . . . . . . . . 6 Germanium Diodes; Balanced modulator, RF sampling, and crystal calibrator harmonic generation. 10 Silicon Diodes: ALC rectifiers, anti- trip rectifiers, and DC blocking. 2 Zener Diodes: cathode bias, LMO power. Rear Apron Connections . . . . . . . . CW Key jack 8 ohm output Phone patch input ALC input Power and accessory plug RF output Antenna switch Receiver antenna Spare A Spare B Power Requirements . . . . . . . . . . 700 to 850 volts at 250ma with 1% maximum ripple 300 volts at 150ma with 0.05% max ripple -115 volta at 10ma with 0.5% max ripple 12 volts AC/DC at 4.76a Dimensions . . . . . . . . . . . . . . 14 7/8w x 6 5/8h x 13 3/8d Weight . . . . . . . . . . . . . . . . 17.5 lbs (Data taken from Heathkit SB-102 manual by KB7RGG)