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peter_sol · 8th Mar 2019, 7:29 am

The broadcasters used "Music lines" when avaliable which were equalized for frequency at the receiving end.
They were connected at both ends with balancing transtormers and fed from an impedance of 75 ohms in the case of an OB or 600 ohms in the case of a shorter fixed line.
Terminated with 600 ohms at the receiving end.
The lines for the OB's were set up by BT so would be just the cable ends coiled up out of sight somewhere near or a terminating box if used frequently.
The mixer would be connected to a dedicated box which had the line sending and receiving amplifiers all in one unit for the programme line out and the control line (talkback) in.

8th Mar 2019, 7:29 am	#6
peter_sol Octode Join Date: Aug 2003 Location: Welwyn Garden City, Herts. UK. Posts: 1,906	Re: Radio 1 Roadshow, 1970s and 1980s The broadcasters used "Music lines" when avaliable which were equalized for frequency at the receiving end. They were connected at both ends with balancing transtormers and fed from an impedance of 75 ohms in the case of an OB or 600 ohms in the case of a shorter fixed line. Terminated with 600 ohms at the receiving end. The lines for the OB's were set up by BT so would be just the cable ends coiled up out of sight somewhere near or a terminating box if used frequently. The mixer would be connected to a dedicated box which had the line sending and receiving amplifiers all in one unit for the programme line out and the control line (talkback) in.