55G-1 Low Frequency Tuner

THE COLLINS 55G-1 Low Frequency Tuner

The 55G-1/LF Low-Frequency Tuner is a manually operated tuner that is an accessory unit for the 51S-1 Receiver. It improves the sensitivity and input selectivity of the 51S-1 between 200 and 2000 kHz, and greatly reduces cross modulation and spurious responses caused by strong broadcast station signals. Besides the tuner, the 55G-1 cabinet also contains a 4-ohm loudspeaker for the 51S-1. Power for the 55G-1 is obtained from an internal power supply which operates from 115 or 230 volts ac at 50 to 400 Hz, or from 28 volts dc. The 55G-LF is a 55G-1 mounted in a standard rack that is 19 inches wide.

55G-1 SPECIFICATIONS

LOW FREQUENCY TUNER/SPEAKER

Frequency range .............. 200 to 2000 kHz covered
                               in two bands; 200 to 600
                               kHz and 600 to 2000 kHz.

Tuning ....................... Manual from front panel.

Band selection ............... Front panel band switch
                               (OFF position bypasses tuner).

Types of reception ........... All types. 51S-1 receives
                               AM, USB, LSB, and CW.

Type of service .............. Continuous, unattended.
Input and output impedances .. 50 ohms, unbalanced.

Sensitivity .................. The sensitivity values list below
                               are valid only if the 51S-1 being used
                               with the 55G-1 meets the published
                               sensitivity values.

AM ........................... 5 microvolts for not less than
                               10-dB signal-plus-noise to noise ratio.

CW and ssb ................... 1 microvolt for not less than 10-dB
                               signal-plus-noise to noise ratio
                               carrier on to carrier off.

Power requirements ........... 115 or 230 volts, 50 to 400 Hz,
                               or 28 volts dc at 1 watt.

Loudspeaker Size ............. 12.7 cm (5 in) by 17.78 cm (7 in).

Impedance .................... 40hms.

Dimensions ................... 19.69 cm (7.75 in) high by 25.4 cm
                               (10 in) wide by 20.32 cm (8 in) deep.

Weight ....................... 2.95 kg (6.5 Lb).

Under the hood...

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Copyright © 1999-WA3KEY & 1976-Collins Radio Company
This Home Page was created by wa3key, Thursday, May 6, 1999
Most recent revision Thursday, May 6, 1999