Connecting several TV (VHF) receivers to the antenna. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Television antennas
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On fig. 1 shows antenna matching schemes with several receivers: VHF radios and TVs. The connection to the antenna is made using a standard 75 ohm coaxial cable. Coordination of the antenna with several receivers of radio signals is possible both with the help of fairly simple resistive dividers, and with the help of fairly complex circuits that use RF transformers, RF inductors, etc. in their composition.
Rice. 1 Diagrams for connecting several receivers to the antenna (VHF and TV):
a - two
b - three or more
c - two at low signal attenuation.
On fig. 1.a shows a diagram of the optimal connection to the antenna of two receivers (VHF radios and TVs) using a resistor divider.
On fig. 1.b shows a diagram of the optimal connection to the antenna of three or more receivers (VHF radios and TVs) using a resistor divider.
The matching circuit for an antenna and several receivers using a resistor divider is, of course, simple, but it significantly attenuates the useful signal. This often requires subsequent amplification with an antenna amplifier. The attenuation of the signal from the antenna can be reduced by using appropriate matching circuits with RF transformers.
On fig. 1.c shows a diagram of the optimal connection to the antenna of two receivers (VHF radios and TVs) using a circuit using RF transformers. This scheme provides transmission from the antenna to the signal receivers of a larger value (greater fraction) of the radio signal, i.e. matching with the antenna is accompanied by less loss of the useful signal.
Publication: cxem.net
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