58 -- Radio System Receiver

The Coast Guard is seeking possible sources for the replacement of approx. 400 Scientific Radio Systems Inc. SR-501 2182 KHZ receivers. These receivers are used to guard the 2182KHz distress frequency and must operate continuously 24 hours/day,7 days/week. General Specifications: Size: Not to exceed 5.25”(H) x 19”(W) x 22”(D) Weight: Not to exceed 25 LBS Operating Temperature: 0-40C Humidity: 95% Primary power: 115Vac, 60HZ (nominal) Mounting: Rack Mountable Radios shall be of a shipboard use design. Vendors are requested to cite the specific Military or Commercial shock, vibration, and environmental standards their radio meets. Receiver Characteristics: Frequency: 2182 KHZ Mode: USB Bandwidth: 3KHZ Sensitivity in USB: –110 dBm for 10dB(s+n)/n Squelch: User controllable over a 110 dB range Audio Output Characteristics: Loudspeaker: Internal speaker with one volume control to monitor received audio. Audio output: 0 dBm, 600 ohms balanced center-tapped pair, short circuit protected, less than 3% distortion at rated output Frequency Response: 100 Hz to 5 kHz (-3 dB) RF Input Characteristics: Antenna: 50 ohm (VSWR <3:1) The current radios are fixed frequency, mode and bandwidth. Replacement in kind is desired. However, the CG will consider a tunable receiver if it includes a method of controlling and displaying the frequency, mode, and any other variable parameters locally. Variable-frequency radios must also be configurable to automatically tune to 2182 KHZ, USB after power is interrupted and restored. All technical questions and/or issues are to be directed to Steven Masters (703) 313-5594 or Randy Robish (703) 313-5561.