Same here Dana. As strange as the thought is, they seem to be very reliable and sound great, without the noise of a real eq'ed copper pair.
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Equalized Phone Line
- Thread starter jimoneal
- Start date
Two years ago we finally pulled out two end to end copper pair program feeds. Been in there for 20+ years. Used our own EQ on them. Now using ISDN & IP.
Way back in the 70's the station had a backup program line that was nothing but copper. It was a good 30 miles long. Not many highs in that circuit. We discovered you could hook a pair of field phones to it. Cranking one end would ring the other! They later used it for the remote control. Kept having noise & loss issues. Telco did an audit and found it had 2 other pairs bridged on it. One going 6 miles to another station's studio (!?!) and the other just 3 miles of wire to an open end.
Way back in the 70's the station had a backup program line that was nothing but copper. It was a good 30 miles long. Not many highs in that circuit. We discovered you could hook a pair of field phones to it. Cranking one end would ring the other! They later used it for the remote control. Kept having noise & loss issues. Telco did an audit and found it had 2 other pairs bridged on it. One going 6 miles to another station's studio (!?!) and the other just 3 miles of wire to an open end.
B
bilco
Guest
The field phone trick is a good one. Does anyone still use the trick of placing a switch in the center tap to ground at one end of the true dry pair and then a low current relay between center tap and a DC power supply at the other end? Poor man's remote control when it worked. I haven't tried it in 30 + years , but it saved my butt a couple of times.
bilco said:
Actually Gates and several other manufacturers of remote amplifiers used to build that function into the units that were designed for regular unattended broadcasts from fixed points like a church or business reports from a local brokerage firm. Patching the remote line through to the board would connect a low DC voltage through the center taps and ground to activate the relay at the remote location.
I once worked at a station once that kept an engineer at the transmitter and they used a dry line with field phones for the control room operator and transmitter operator to communicate.
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