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Last modified 2023-07-09

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National NC-303

A picture of National NC-303

SPECIFICATIONS

GENERAL
Type:Ham band HF receiver
Frequency range: 10-160 m + 11 m in seven bands (6 m / 2 m / 1.25 m options)
160 m:   1.8-2.0 MHz
80 m:   3.5-4.0 MHz
40 m:   7.0-7.3 MHz
20 m:   14.0-14.4 MHz
15 m:   21.0-21.5 MHz
11 m:   26.5-27.5 MHz
10 m:   28.0-29.7 MHz
Tuning steps:Analog / continuous
Frequency stability:? ppm
Mode:AM / SSB / CW
Channels / memory management: None
Power supply:Mains: 105-130 VAC
Current drain / power consumption:Max 70 W
Antenna impedance / connector:Hi-Z / random wire (50-70 ohm / SO-239 option)
Dimensions (W*H*D):495*286*381 mm (19.5*11.25*15")
Weight:27.2 Kg (60 lb)
Other features:Q-multiplier.




RECEIVER SECTION
Receiver system: Double conversion superheterodyne
1st IF: 2.175 MHz
2nd IF: 455 KHz
Sensitivity:1.5 uV (10 dB S/N)
Selectivity: Selectable
8, 3.5, 2 KHz and 400 Hz
Image rejection:50-80 dB
AF output power / speaker:1 W at 10% distortion / No internal speaker
External speaker connector:Screw terminals, ~4 ohm




MISCELLANEOUS
Manufactured:USA, 1958-1962 (Discontinued)
Additional info:
Related documents:User manual (2.2 MB)
Modifications and fixes:
Reviews: CQ: December 1958
QST: April 1959, page 42
Options / Accessories:
NC-300C1
NC-300C2
NC-300C6A
NTS-2S
XCU-300
XCU-303
220 MHz converter, 220-225 MHz
2 m converter, 143.5-148.5 MHz
6 m converter, 49.5-54.5 MHz
External speaker, 3.2 ohm
Crystal calibrator (100 KHz)
Crystal calibrator (100 KHz) with WWV 10 MHz RX
A rear picture of National NC-303