en:e-626
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+ | ====== E-626: Zenith Trans Oceanic H500 ====== | ||
+ | **E-626**, **Zenith Trans Oceanic H500**; manufactured by [[Zenith|Zenith Radio Corp., Chicago, IL]]. | ||
+ | Obviously, the [[Zenith]] **Trans Oceanic H500** was also used by the Swiss Army, but I do not yet have any information on purpose and quantities purchased. | ||
+ | |||
+ | {{: | ||
+ | ===== Technical Data ===== | ||
+ | * [[Principle]]: | ||
+ | * [[Modes]]: [[A3|AM (A3)]] | ||
+ | * [[Frequency range]]: 2-4 MHz, 4-8 MHz, 31 m, 25 m, 19 m, 16 m shortwave band | ||
+ | * **Analog dial** | ||
+ | * [[Sensitivity]]: | ||
+ | |||
+ | ==== Power Supply ==== | ||
+ | * [[Mains]]: 117, 220 V | ||
+ | * [[Accumulator / Batteries]]: | ||
+ | |||
+ | The receiver can be operated with batteries (which are no longer available today) or with mains power, the U.S. version is intended only for operation at 117 V (US mains voltage), the international version can be operated | ||
+ | |||
+ | ==== Dimensions ==== | ||
+ | * 430 x 280 x 200 mm, 8 kg | ||
+ | |||
+ | ==== Accessories ==== | ||
+ | * a telescopic antenna is used as standard antenna for shortwaves, a detachable frame antenna is used for mediumwaves, | ||
+ | |||
+ | ---- | ||
+ | {{: | ||
+ | |||
+ | ===== Operation ===== | ||
+ | The [[Zenith]] H500, which got the Swiss Army designation E-626, is a quite heavy hollow state multiband radio, the set looks like a black suitcase with a carrying handle, it's dimensions are 43 x 28 x 20 cm. | ||
+ | |||
+ | The receiver can be powered from batteries (which are not available anymore, you would need an anode / B+ high tension battery) or mains. Be very careful before powering up your recently acquired H500: the U.S. version can only be operated from 117 V (mains voltage found in the U.S.), the international version can be operated from 110 or 220 V AC, a voltage dropping resistor is used. | ||
+ | |||
+ | A metal lock at the front unlocks the big lid of the receiver, under the lid, You find the detachable "Wave Magnet" | ||
+ | |||
+ | The speaker grille takes the left third of the front panel. On the right third of the frontpanel, You find the pushbuttons to select the different bands, the receiver covers mediumwaves (BC stands for Broadcast Band), the tropical bands in the 2-4 and 4-8 shortwave ranges and the 31, 25, 19 and 16 m broadcast bands. You find the necessary informations, | ||
+ | |||
+ | In the middle of the frontpanel, You find the round frequency dial. The arrangement of the different bands seems a little bit confusing to me: the broadcast bands are marked red in the 2-4 and 4-8 MHz shortwave bands, the markings for the 16 m band are found between the 2-4 MHz (120-80 m) and the 19 m band dials, the mediumwave frequencies have to be read from the U shaped dial below the 25 m band dial... | ||
+ | |||
+ | The two knobs below the round dial are the volume control and the tuning knob. Four small red sliding switches TREBLE - VOICE - ALTO - BASS are used as tone control, this arrangement called "Radio Organ" can be found on all classic Zenith Trans Oceanic receivers. | ||
+ | |||
+ | The operation scheme of the H500 receiver is not complicated, | ||
+ | |||
+ | The volume control acts as main switch, use the band selector pushbuttons to select the desired shortwave band and look for the corresponding band on the round dial. The dial marks are very coarse, so you have to search for the station and to identify it by the language and a spoken identification or interval signal. The H500 has no BFO for [[CW]] and single sideband reception, all these features have been found in commercial communication receivers only in the fifties, when the Trans Oceanic has been constructed. | ||
+ | |||
+ | ===== Technical Principle ===== | ||
+ | From the technical point of view, the H500 is a single conversion superhet with one RF preamplifier stage: After the RF amplifier (V1: [[de: | ||
+ | |||
+ | ==== Valve setup ==== | ||
+ | V1 ([[de: | ||
+ | |||
+ | ==== Development ==== | ||
+ | [[Zenith]] developed the model 7G605 as one of the earliest portable multi - band travel radios to help expeditions stay in contact with their home base, it already featured many goodies found in the later **Trans Oceanic** models. This " | ||
+ | ==== Field use ==== | ||
+ | Information about the purpose of the E-611 / Hallicrafters SX-23 in the Swiss Army is missing, the receiver is likely to have been in use for radio monitoring purposes. | ||
+ | |||
+ | {{gallery>: | ||
+ | |||
+ | ==== Manuals ==== | ||
+ | |||
+ | ==== Additional information ==== | ||
+ | * [[http:// | ||
+ | * [[http:// |
en/e-626.txt · Zuletzt geändert: 2019/04/04 20:20 von 127.0.0.1