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Last modified 2014-03-31

National NC-240D

A picture of National NC-240D

SPECIFICATIONS

GENERAL
Type:HF receiver
Frequency range:0.49-30 MHz
Tuning steps:Continuous
Mode:AM/CW
Channels/memory management:None
Power supply:Mains 110/120 and 220/240 VAC
Current drain/power consumption:70 W
Antenna impedance/connector:500 ohms / Screw terminals
Dimensions (W*H*D):Table version: 489*279*305 mm (19.25*11*12")
Rack version: 483*267*444 mm (19*10.5*17.5")
Weight:Table version: 27.2 Kg (60 lbs)
Rack version: 29.5 Kg (65 lbs)
Other features:Bandspread on 10, 11, 20, 40 and 80 m bands
Tone control, AUX audio input jack




RECEIVER SECTION
Receiver system:Single conversion superheterodyne
IF: 455 KHz
Sensitivity:1 uV (6 dB S/N)
Selectivity:Crystal filter off:
4 KHz (-6 dB), 22 KHz (-60 dB)
Crystal filter on:
Position 1: 6 KHz
Position 2: 4 KHz
Position 3: 2 KHz
Position 4: 1 KHz
Position 5: 200 Hz
Image rejection:0.49-10 MHz: 50 dB
10-15 MHz: 40 dB
15-30 MHz: 30 dB
AF output power/speaker:8 W at 1% distortion / 10 Kohms
External speaker connector:5-pole




MISCELLANEOUS
Manufactured:USA, 1946-1949 (Discontinued)
Additional info:This receiver had an additional model designation letter: NC-240DT for
"table" version, and NC-240DR for "rack mounting" version.
Early versions featured a round S-meter while later sported a square one.
New price 1947 in the US: $241.44
Related documents:Manual (2.3 MB, Page 4 missing)
Modifications:
Options/Accessories:
NC-2 RS
NC-2 TSG
10" PM speaker mounted on standard rack panel for NC-240DR
10" PM speaker in matching cabinet for NC-240DT