Note
QST, Mar 1967, p. 135.
The Squires-Sanders SS-IBS is a international broadcast receiver. An unusual feature is motor-assisted tuning with two buttons under the main knob. The SS-IBS was a highly advanced receiver for its time, and was designed for commercial and broadcast applications.
Features
– Front-End & Mixing: Uses 7360 beam-deflection tubes for the 1st and 2nd mixers to provide exceptional freedom from cross-modulation and overload while maintaining a high signal-to-noise ratio.
– Double Conversion Scheme: Employs a fixed 5.0–5.5 MHz first IF bandpass (except on the 7.0–7.5 MHz band, which uses single conversion) and a 1 MHz second IF.
– Frequency Tuning & Readout: Combines a 12-position 360 degrees continuous bandswitch drum dial for 500 kHz band segments with a digital readout (counters indicating 0 to 99 kHz directly) alongside a slide-rule dial.
– Frequency accuracy of 1 kHz is achieved with an odometer-type two digit display used in conjunction with the analog dial.
– Overload & Interference Resistance: Built to extract weak signals located only a few kilocycles away from powerful broadcast stations, featuring high immunity to cross-modulation and front-end overload.
– Tuning & Readout: Includes a digital readout displaying frequency directly in kilocycles, alongside a tuning mechanism equipped with a motor drive for rapid band traverse.
– Selectivity Options: Features sharp crystal lattice filtering with selectable bandwidths of 8.0 kHz, 5.0 kHz, and 2.5 kHz.
– Operating Modes: Supports AM, USB, LSB, and CW, with built-in provisions for exalted carrier reception.
– Outputs: Equipped with connections for monitoring via headphones/external speaker, recording, direct rebroadcasting, and visual band analysis.
– Motor-Driven Tuning: Equipped with a fast-traverse, push-button motor drive for rapid band sweeps that automatically disengages via a clutch for manual tuning
– Optional SS-IS noise blanker
– Optional SS-IV panoramic display
Specifications
– Frequency coverage (MHz) is:
3.5-4.0
5.9-6.4
7.0-7.5
9.5-10
11.5-12.0
15.0-15.5
17.5-18.0
21.4-21.9
25.6-26.1
– Additional coverage is provided for WWW (5.0-5.5) and at 10 MHz.
– Selectivity: Offers three selectable IF bandwidths (8.0 kHz, 5.0 kHz, and 2.5 kHz). The 2.5 kHz position uses a high-Q bandpass crystal filter with a 60/6 dB shape factor of only 2:1 for SSB/exalted-carrier AM reception.
– Sensitivity: < 0.5 uV for 10 dB S+N/N in 2.5 kHz bandwidth (< 1.0 uV on 7.0–7.5 MHz band)
– Frequency Accuracy & Stability ±1 kHz max error; < 500 Hz cold drift (warm-up < 5 min), < 100 Hz/hr afterwards
– AGC Settings: Fast attack (1 ms); Fast release (0.1 s); Slow release (1.0 s)
Tube Lineup (12 total)
V1E 6BA6 Crystal calibrator
V1 7360 1st mixer
V2 7360 2nd mixer
V3 6BH6 Crystal oscillator
V4 6BA6 1st IF
V5 6BA6 2nd IF
V6 6AL5 ANL
V7 6AX8 3rd IF / 1st AF
V8 6AV6 AGC
V9 6BE6 Product detector
V10 6AS5 Audio output
V11 6BK7 6.0–6.5 MHz VLO
Power Requirements: 115/230 VAC, 50/60 Hz, 55 watts
References
Brief description. Popular Electronics, Oct 1968, p. 54.
Key words:
SS-1BS
