überarbeitet am 25.4.2012
There is some evidence that the Zenith H500 World Band Radio has seen use with the Swiss Army in small numbers.
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.
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, which shortwave band to use at which time of day, printed on the dial.
The operation scheme of the H500 receiver is not complicated, once you made the first step and applied the correct voltage. As this "Trans Oceanic" is a "grandfather" among the travel shortwave radios, I recommend you to power it from a regulated power supply where You can slowly increase the power over some hours to avoid damages to the capacitors after having checked the radio for faulty capacitors.
From the technical point of view, the H500 is a single conversion superhet with one RF preamplifier stage: After the RF amplifier (V1: 1U4), the signal is fed to the mixer stage (V2: 1L6) where the intermediate frequency of 455 kHz is generated. After an I.F. amplifier stage (V3: 1U4), the signal is demodulated, the same valve (V4: 1S5) acts as AF preamplifier, a 3V4 (V5) acts as final AF amplifier.
© Martin Boesch 25.4.2012