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+ | ====== E-643: Collins 51S-1 ====== | ||
+ | **E-643**, **Shortwave Receiver Collins 51S-1**; manufactured by [[Collins|Collins Radio Company, Cedar Rapids, USA]]. | ||
+ | The venerable [[Collins]] 51S-1, a very compact allwave receiver with a mixed mechanical analog frequency dial, has also been in use with the Swiss Army, probably in the signals intelligence section. | ||
+ | |||
+ | {{: | ||
+ | ===== Technical Data ===== | ||
+ | * [[Principle]]: | ||
+ | * [[Modes]]: [[A1]] with BFO, [[A3J|SSB (A3JO/U)]], [[A3|AM (A3)]] | ||
+ | * [[Frequency range]]: 0 - 30 MHz | ||
+ | * **Analog dial**, linear analog dial, accuracy better then 1 kHz. | ||
+ | * [[Sensitivity]]: | ||
+ | |||
+ | ==== Power Supply ==== | ||
+ | * [[Mains]]: 115 / 230 V; 85 W | ||
+ | |||
+ | ==== Dimensions ==== | ||
+ | * 375 x 167 x 332 cm, 11.8 kg | ||
+ | |||
+ | ==== Accessories ==== | ||
+ | |||
+ | ---- | ||
+ | |||
+ | {{: | ||
+ | ===== Operation ===== | ||
+ | The Collins 51S-1 with it's metal cabinet painted in grey is a very compact set compared to the [[E-629|E-629 / 51J-4]] receiver; its dimensions are 37,5 x 16,7 x 33,2 cm and its weight 11,8 kg, - a hollow state double conversion set in such a small cabinet is a suprising bit of engineering. | ||
+ | |||
+ | The 51S-1 is prepared to be powered by 115 or 230V AC, the power consumption of the 17 valves is 125W. | ||
+ | |||
+ | The different rear connectors make it obvious, that the 51S-1 has its roots among the professional receivers: there are not only connectors for low and high impedance antennas but also for an external VFO, a 500 kHz IF output, and a connector for a long- and mediumwave converter. | ||
+ | |||
+ | The front panel gives a very basic first impression: in contrast to several older professional receivers from Collins, the 51S-1 comes with only nine frontpanel controls: The analog dial has an accuracy of better then 1 kHz, the MHz-digit is moved by the MHz-bandswitch and the 0.1 MHz digit is moved by the main tuning knob like an odometer, You hear a click when You go passed a ...99 / ...101 kHz step. You can adjust the zero line of the main dial with the "Zero set" | ||
+ | |||
+ | The mains switch in the left upper corner has a " | ||
+ | |||
+ | The RF gain and AF gain / volume controles are situated at the left and the right of the main tuning knob. Between this and the AF gain control, you find the modes switch - upper and lower sideband filters can be switched independently - and a control called " | ||
+ | |||
+ | The I.F. bandwidth filters switching is coupled with reception modes: in AM reception a LC or optional a much more expensive 6 kHz mechanical filter is in use, for USB/LSB a 2,4 kHz or an optional 2,75 kHz mechanical filter is switched in the circuit, for CW reception a 800 Hz crystal filter or an optional narrow 200 Hz filter.\\ | ||
+ | The S-meter in the right upper corner of the front panel can be switched to display the RF or the audio frequency level. | ||
+ | |||
+ | To me, it's still unclear in which roles the 51-S1 has been used by Swiss Army branches, but the receiver exists in the inventary of receiving equipment. | ||
+ | |||
+ | ===== Technical Principle ===== | ||
+ | {{: | ||
+ | The high frequency signal from the antenna input will first pass a bandpass filter and the mechanically coupled automatic preselection stage. In the 0,2 - 2 MHz ranges, the signal is internally up-converted to 28-30 MHz. | ||
+ | In the 2 - 7 MHz band segments, the signal will - after the first RF amplification stage - be converted to 14,5-15,5 MHz, in the second mixer to 2 - 3 MHz and in the third mixer to the last IF of 500 kHz - thus triple conversion operation. | ||
+ | |||
+ | In the 7 - 30 MHz segments, the signal will be directly converted into 2 - 3 MHz in the first mixer and to 500 kHz IF in the second mixer stage double conversion operation in these ranges. | ||
+ | |||
+ | The 500 kHz IF will have to pass the 6 kHz LC filter in AM mode, the mechanical 2,4 kHz USB or LSB filter in SSB mode or the 800 kHz crystal filter in CW mode. After the Q-multiplier circuit with HF notch and two more RF amplification stages, the signal is sent for demodulation to a diode demodulator in AM and a product detector in SSB modes. Two more stages are used for AF amplification. | ||
+ | |||
+ | ==== Valve setup ==== | ||
+ | V1 ([[de: | ||
+ | Various rectifiers in the power supply unit. | ||
+ | |||
+ | ==== Development ==== | ||
+ | [[Collins]] has developed the 51S-1 in around 1959. | ||
+ | |||
+ | ==== Field use ==== | ||
+ | It's still unclear, which was the role assigned to the 51S-1, but seven of this receiver type exist in the inventary of army receiving equipment. | ||
+ | |||
+ | ==== Variants ==== | ||
+ | |||
+ | {{gallery>: | ||
+ | ===== Manuals ===== | ||
+ | |||
+ | ==== Additional information ==== | ||
+ | * [[http:// | ||
+ | * [[https:// |
en/e-643.txt · Zuletzt geändert: 2019/04/07 21:27 von 127.0.0.1