Electronic antenna switch. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / VHF antennas
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The disadvantage of the previously described electronic antenna switches is a significant attenuation in the receive mode, reaching 45-50% (especially in the 21 and 28 MHz bands). The switch, the scheme of which is shown in the figure, provides attenuation of no more than 10%.
In the manufacture of the switch, it is necessary to isolate the body of the output capacitor of the P-circuit (in the diagram - C4) from the chassis with a fluoroplastic or polystyrene gasket 5 mm thick.
The antenna is connected to the Gn1 socket, the receiver input is connected to the Gn2 socket.
Author: V. Davydov (UW9WR), Ufa; Publication: cxem.net
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