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Desktop ULF/VLF Receiver
Marine Shortwave receiver IMR54
Desktop Shortwave receiver

General

HAM bands 2000m  ? 80m  40m  20m  15m  6m  10m 
Freq. stability ? ? ?
Tuning steps Continuous ? Continuous

Receiver

RX-range 15-500 / 500-1500 kHz (2 ranges, 7 bands) 15 kHz - 31 MHz in 10 bands 10-80 m with 2 m / 6 m converter options
Modulations AM   CW   FSK   AM   CW   AM   CW  
Sensitivity 6 µV 15-160 kHz: 4-20 µV (10 dB S/N)
160-1500 kHz: 6-10 µV (10 dB S/N)
1.5-4 MHz: 1.5-3 µV (10 dB S/N)
4-10 MHz: 2-6 µV (10 dB S/N)
10-31 MHz: 2-10 µV (10 dB S/N)
?
Selectivity ? Wide, Intermediate, Narrow and Very narrow settings.
500 Hz ... 25 kHz
?
Filters 0.1 / 1 / 2 / 4 / 8 kHz ? ?
Receiver system Double conversion cuperheterodyne, including circuit arragement for cancelling drift of crystal oscillator (34 tubes) Double conversion superheterodyne ?
IF-freqs. ? ? ?
Image rejection ? ? ?
Audio output 500 mW unbalanced, 10 mW balanced 1 W ?

Transmitter

TX-range - - -
Modulations - - -
RF-output ? ? ?

Connections

Antenna Proprietary - -
Impedance 125Ω 72Ω ?
Other - - -

Electrical

Power req. Mains (115/230 V AC) Mains (110-250 V AC) Mains
Current RX 250 W with oven on, 150 W when oven off 82 W ?
TX - - -

Physical

Manufactured Between 1951 and 19xx in USA Between 1952 and 195x in Great Britain Between 1959 and 19xx in USA
Dimensions 483 × 267 × 438 mm
(19.02 × 10.51 × 17.24 in)
747 × 385 × 451 mm
(29.41 × 15.16 × 17.76 in)
?
Weight 37.20 kg (82.1 lbs) including power supply PP-621/URR 60.90 kg (134.4 lbs) ?
Form factor Base Station Base Station Base Station

Other features

Memories None ? ?
Usage Amateur / Ham radio operators Marine / Navy Amateur / Ham radio operators
Features Operating altitude up to 10,000 feet Automatic volume control ?
Accessories ? ? ?
MPN COLLINS-R-000389/URR EDDYSTONE-000700 HALLICRAFTERS-SX-000101 MK IIIA