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
| 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.
| 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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