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Desktop Shortwave Transceiver
Linear Amplifier
Marine Shortwave receiver IMR54

General

HAM bands ? ? ?
Freq. stability less than 100 Hz drift after 10 minutes warmup ? ?
Tuning steps ? ? ?

Receiver

RX-range 15/20/40 m ? 15 kHz - 31 MHz in 10 bands
Modulations CW   SSB   - AM   CW  
Sensitivity less than 1 µV provides readable signal ? 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 2 kHz (-6 dB) ? Wide, Intermediate, Narrow and Very narrow settings.
500 Hz ... 25 kHz
Filters ? ? ?
Receiver system Direct conversion ? Double conversion superheterodyne
IF-freqs. ? ? ?
Image rejection ? ? ?
Audio output ? ? 1 W

Transmitter

TX-range 15/20/40 m 10 / 11 m -
Modulations CW   AM   SSB   -
RF-output 40m: 3 W, 20m: 2.5 W, 15m: 2 W ? ?

Connections

Antenna BNC SO-239 -
Impedance 50Ω 50Ω 72Ω
Other - - -

Electrical

Power req. 13V DC Mains Mains (110-250 V AC)
Current RX 35 mA ? 82 W
TX 450 mA max ? -

Physical

Manufactured Between 1972 and 1975 in USA Between 19xx and 19xx Between 1952 and 195x in Great Britain
Dimensions 235 × 216 × 108 mm
(9.25 × 8.50 × 4.25 in)
? 747 × 385 × 451 mm
(29.41 × 15.16 × 17.76 in)
Weight 2.04 kg (4.5 lbs) ? 60.90 kg (134.4 lbs)
Form factor Base Station Base Station Base Station

Other features

Memories ? ? ?
Usage Amateur / Ham radio operators Amateur / Ham radio operators Marine / Navy
Features ? ? Automatic volume control
Accessories ? ? ?
MPN HEATHKIT-HW-000007 MAC-L-002000 EDDYSTONE-000700