NC-270

National know-how brings you a precision double conversion receiver at a price all can afford. The instant sideband selection combined with another National "velvet" dial brings you an ease of sideband tuning available only in the finest equipment. The

SPECIFICATIONS

Frequency Ranges
6 meter band 50.0 - 54.0 Mc
10 meter band 28.0 - 29.7 Mc
15 meter band 21.0 - 21.5 Mc
20 meter band 14.0 - 14.4 Mc
40 meter band 7.0 - 7.3 Mc
80 meter band 3.5 - 4.0 Mc

Tuning Control: 12:1 step down ratio with pinch type drive for smooth inertia tuning.

Calibration: Built-in 100 Kc crystal calibrator and exclusive National lateral dial adjustment provide for extremes calibration accuracy.

Intermediate Frequency
1st IF - 2,215 Kc, 2nd IF - 230 Kc

Image Rejection: Double conversion superheterodyne circuit provides optimum image and intermediate frequency rejection on all bands.

Sensitivity: Better then 1.5 microvolt for 1 watt output, 10 db signal to noise ratio.

Special patented "Ferrite Filter" provides instant SSB selection and the following bandwidths:

VERY SHARP 600 cycles
USB 2.5 Kc
LSB 2.5 Kc
MEDIUM 3.0 Kc
BROAD 5.0 Kc

Reception of Amplitude Modulation Signals: A separate linear diode detector is used. Front panel selection of Automatic or Manual Gain Control.

Reception of Single Sideband Signals: Special patented "Ferrite Filter" provides instant selection of upper and lower with special linear heterodyne detector and separate carrier re-insertion.

Reception of CW Signals: Heterodyne detector circuit with separate beat frequency oscillator.

Interference Rejection: "Bifilar T Notch" rejection circuit, tunable over entire IF bandwidth, provides greater than 50 db of interfering signal Rejection.

Noise Limiter: Automatic type, self-adjusting to various signal levels.

Signal Strength Meter: Calibrated in S units from "S-1" to "S-9" (at 50 v input) and "10 db" to "60 db" above S-9.

Audio Power Output: 3.0 watts, better than 1.5 watts at 10% distortion.

Antenna Input: 72 ohms, unbalanced on all bands.

Output Circuit: 3.2 ohms for loudspeaker. Separate front panel headphone jack.

Control Circuit: Standby-Receive switch with separate set of contacts for external control available at rear of receiver. Rear panel circuit is closed in the Standby position only.

Power Line Requirements: 105-125 volts A.C.--- 50-60 cycles--- 75 watts

Front Panel Controls: Tuning, Radio frequency gain, Notch depth, Notch frequency, Beat frequency oscillator, Antenna trimmer, Bandswitch, Mode switch, AM(AGC on), ANL(AGC on), CW/SSB(AGC off), AM(AGC off), ANL (AGC off), Phone jack, Sta

Flip Foot: Unique "Flip Foot" on receiver and matching and matching speaker for maximum operating convenience.

Dimensions: 8 5/8" high---15 5/8" wide---9" deep

Shipping Weight 28 lbs.

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