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Telecommunications / Télécommunications / Telekommunikation / Τηλεπικοινωνιών / Telecomunicazioni / 电信 / الاتصالات السلكية واللاسلكية / Telecomunicaciones / दूरसंचार
Telecommunications / Télécommunications / Telekommunikation / Τηλεπικοινωνιών / Telecomunicazioni / 电信 / الاتصالات السلكية واللاسلكية / Telecomunicaciones / दूरसंचार
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CommsLinkTestSheet2
![CommsLinkTestSheet2 CommsLinkTestSheet2](https://cdn.ipernity.com/200/29/28/45892928.2df4d647.640.jpg?r2)
![](https://s.ipernity.com/T/L/z.gif)
A two page test report for the transmission links for a two-way radio system. The links joined the track-side base stations and the control centre. The system is no longer in use. This is used for checking the links shown here: www.ipernity.com/doc/grahamh/24117033
E&M signalling over copper pairs in Australia was done using the 4W (1 pair each direction for the audio signal) circuit, ie no additional conductors. This is done in a similar manner to that used in feeding DC power to a condenser/electret microphone in a public address or studio sound system. The direct current for the signalling flows one way equally on both wires of a pair with the earth being used as the return conductor.
E&M signalling over copper pairs in Australia was done using the 4W (1 pair each direction for the audio signal) circuit, ie no additional conductors. This is done in a similar manner to that used in feeding DC power to a condenser/electret microphone in a public address or studio sound system. The direct current for the signalling flows one way equally on both wires of a pair with the earth being used as the return conductor.
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