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Mobile UHF Transceiver
Desktop Shortwave receiver
Marine Shortwave receiver IMR54

General

HAM bands 70cm  ? ?
Freq. stability ? Less than 50hz/hr drift after warm up under constant supply and temperature conditions. ?
Tuning steps FM: 1 / 5 / 25 kHz, SSB/CW: 0.1 kHz ? ?

Receiver

RX-range 430-440 MHz 0.5-30 MHz 15 kHz - 31 MHz in 10 bands
Modulations FM   CW   SSB   AM   CW   AM   CW  
Sensitivity ? ? 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 ? 13 khz @-6db
6.5 khz @-6db
3 khz @-6db
1.2 khz @-6db
300 hz @-6db
100 hz @-6db
Wide, Intermediate, Narrow and Very narrow settings.
500 Hz ... 25 kHz
Filters ? 13 / 6.5 / 3 / 1.2 / 0.3 / 0.1 kHz ?
Receiver system Double conversion superheterodyne Double/triple conversion, 23 tubes Double conversion superheterodyne
IF-freqs. 1st: 39380 kHz
2nd: 1075 kHz
40 kHz
2.5 kHz
?
Image rejection ? ? ?
Audio output internal speaker ? 1 W

Transmitter

TX-range 430-440 MHz - -
Modulations FM   CW   SSB   - -
RF-output High: 10 W, Low: 1 W ? ?

Connections

Antenna N-type Burndept -
Impedance 50 Ω 75Ω 72Ω
Other - - -

Electrical

Power req. 13.8V DC Mains Mains (110-250 V AC)
Current RX ? ? 82 W
TX 3.6 A max - -

Physical

Manufactured Between 1982 and 19xx Between 1957 and 19xx in Great Britain Between 1952 and 195x in Great Britain
Dimensions 170 × 64 × 218 mm
(6.69 × 2.52 × 8.58 in)
480 × 265 × 510 mm
(18.90 × 10.43 × 20.08 in)
747 × 385 × 451 mm
(29.41 × 15.16 × 17.76 in)
Weight 2.60 kg (5.7 lbs) 30.50 kg (67.3 lbs) 60.90 kg (134.4 lbs)
Form factor Mobile Base Station Base Station

Other features

Memories 4 channels in 1 bank(s) ? ?
Usage Amateur / Ham radio operators Military communication Marine / Navy
Features Dual VFO's. Scanning ? Automatic volume control
Accessories ? ? ?
MPN ICOM-IC-000490E RACAL-RA-000017L EDDYSTONE-000700