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+ | ====== E-616: National NC - 100 XA ====== | ||
+ | **E-616**, **All Wave Receiver NC - 100 XA**; developed and produced by [[National|National Company Inc., Malden, MA]]. | ||
+ | The NC-100A is a successor to the famous [[National]] [[E-610|HRO]]: | ||
+ | |||
+ | {{: | ||
+ | ===== Technical Data ===== | ||
+ | * [[Principle]]: | ||
+ | * [[Modes]]: [[A1|CW (A1)]], [[A3J|SSB (A3J]] with BFO, [[A3|AM (A3)]] | ||
+ | * [[Frequency range]]: 540 kHz - 30 MHz in five ranges (0.2 - 0.4 MHz / 1.3 - 2.8 MHz / 2.7 - 6.4 MHz / 6.4 - 14 MHz / 14 - 30 MHz ( Coil Catacomb) | ||
+ | * **Analog dial**, nonlinear | ||
+ | * [[Sensitivity]]: | ||
+ | |||
+ | ==== Power Supply ==== | ||
+ | * [[Mains]]: 115 V, 70 W | ||
+ | * [[Accumulator / Batteries]]: | ||
+ | |||
+ | ==== Dimensions ==== | ||
+ | * 438 x 272 x 298 mm | ||
+ | |||
+ | ==== Accessories ==== | ||
+ | The original speaker which matches the NC-100 has an impedance of 500 ohms, designation of the receiver together with the external speaker is NC-100 XSA . | ||
+ | |||
+ | ---- | ||
+ | |||
+ | ===== Operation ===== | ||
+ | The big tuning knob is located in the center of the front panel, above it the semicircular frequency dial. A mechanically driven dial pointer points to the dial corresponding to the frequency band; in contrast to the [[HRO]], the frequency dial is calibrated so the frequencies can be read directly on the NC-100A. Similar to the HRO, there is also a logging dial with 0 - 1000 divisions to retune known stations using a frequency logging chart. | ||
+ | |||
+ | The coil sets are located in the bottom of the receiver in a kind of coil drawer (which is called "Coil Catacomb" | ||
+ | |||
+ | Left to the frequency scale, the signal strength meter and the operation switch is located. It has three positions: OFF (receiver turned off), B + OFF (tubes heated, no plate voltage B+) and B + ON for operation. | ||
+ | |||
+ | Just below it is the RF Gain control for the RF amplification. In the left lower corner, the controls for the NOISE LIMITER (turned off in position 0) and the tone control are located. | ||
+ | |||
+ | To the right of the frequency dial, there switches for automatic volume control (AVC), for manual gain control MVC and a third position for [[CW]] reception with manual gain control and activated BFO. The BFO pitch can be adjusted with the CWOSC. control. | ||
+ | |||
+ | The AFGAIN CONTROL knob at the right of the frequency dial acts as volume control. | ||
+ | |||
+ | ===== Technical Principle ===== | ||
+ | Technically speaking, the NC-100A is a single conversion superhet with a RF preamplifier: | ||
+ | A speaker with an impedance of 600 ohms can be connected to the receiver directly, to drive a modern low-impedance speaker, an output transformer is necessary. | ||
+ | |||
+ | For A1 / CW reception the signal of the Beat Frequency Oscillator (V-108: [[de:6J7]]) is fed to the IF before demodulation. In contrast to the [[HRO]] receiver, the set comes with a built-in power supply; a [[de:5Z3]] acts as rectifier tube (V-110). | ||
+ | |||
+ | ==== Valve setup ==== | ||
+ | V101 ([[de: | ||
+ | V110 ([[de: | ||
+ | |||
+ | ==== Development ==== | ||
+ | The NC-100 was developed as a successor to the legendary [[HRO]], the coils in the NC-100 are moved in the "coil catacomb" | ||
+ | |||
+ | ==== Field use ==== | ||
+ | Several receivers from [[National]] are found in a list of Swiss Army receiving equipment, most of them were acquired in very small numbers for special purposes.\\ | ||
+ | Apparently different variants of the National NC-100A were used, the NC-100XA comes with a crystal filter, the NC-100 XSA the same with the matching external loudspeaker. | ||
+ | |||
+ | * **E-616** : National NC-100 XA (with quartz filter) | ||
+ | * **E-617** : National NC-100 XSA (with quartz filter and external speaker) | ||
+ | * **E-618** : National NC-100 A (basic model with directly readable frequency dial instead of HRO dial) | ||
+ | |||
+ | {{gallery>: | ||
+ | |||
+ | ==== Manuals ==== | ||
+ | |||
+ | ==== Additional information ==== | ||
+ | * [[http:// | ||
+ | * [[http:// |
en/e-616.txt · Zuletzt geändert: 2019/03/31 09:38 von 127.0.0.1