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Last modified 2023-07-09

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National NC-400

A picture of National NC-400

SPECIFICATIONS

GENERAL
Type:General coverage HF receiver
Frequency range: 0.54-31 MHz in seven bands
A:   0.54-1.1 MHz
B:   1.1-2.1 MHz
C:   2.1-4.1 MHz
D:   4.1-7.0 MHz
E:   6.9-12.2 MHz
F:   11.8-20.4 MHz
G:   19.6-31 MHz
Tuning steps:Analog / continuous
Frequency stability:0.002% after warmup (No temperature reference)
Mode:AM / SSB / CW
Channels / memory management: 5 optional XTAL controlled
Power supply:Mains: 115 / 230 VAC
Current drain / power consumption:138 W
Antenna impedance / connector:? ohm / ?
Dimensions (W*H*D):482*279*406 mm (19*11*16")
Weight:? Kg (? lb)
Other features:Bandspread. IF out jack.




RECEIVER SECTION
Receiver system: Single conversion superheterodyne (Below 7 MHz)
IF: 455 KHz
Double conversion superheterodyne (Above 7 MHz)
1st IF: 1.72 MHz
2nd IF: 455 KHz
Sensitivity:1 uV (10 dB S/N)
Selectivity: Selectable
16, 8, 4 and 3.5 KHz (-6 dB)
Image rejection:80-100 dB
AF output power / speaker:1 W at ?% distortion / No internal speaker
External speaker connector:3.2 ohm




MISCELLANEOUS
Manufactured:USA, 1959-1963 (Discontinued)
Additional info: 18 tubes
Was commonly used in FBI field offices
Related documents:
Modifications and fixes:
Reviews: CQ: April 1960
QST: February 1960, page 44
Options / Accessories:
NC-400 DMK NTS-2
XCU-400
Diversity modification kit
Matching speaker
Calibrator