Patent GB-534283-A (GB)
Title: Improvements in or relating to the distribution of radio-broadcast programmes
IPC: H04H20/82
Filed: 1939-09-01
Abstract: 534,283. Distributing music &c. STANDARD TELEPHONES & CABLES, Ltd., MEERS, R. A., and FILBY, F. G. Sept. 1, 1939, No. 25113. [Class 40 (iv)] At a repeating centre for distributing a number of broadcast programmes to wireless transmitters or for redistributing received.programmes over a network to listeners, selected connections over the repeaters between incoming and outgoing lines are prepared during the existence of one set of connections by manual selectors and the breaking down of one set of connections and establishment of another set is effected by a positive operation such as pressing re-set and set keys. In the arrangements described, facilities are provided for selective connecting incoming lines A-F one at a time to each of four repeaters W-Z each of which may be connected to one or more outgoing lines M-R. Some lines may be used alternatively as incoming or outgoing lines. Connections of incoming lines to repeaters. The manual selectors WIS, XIS, Fig. 2, individual to the repeaters are set on the desired contacts a-f corresponding to the incoming lines. The switch WIS for example prepares to operate one of a group of relays WAR-WFR associated with repeater W, the actual operation of the relay being effected when re-set and set keys individual to the repeater are momentarily pressed. When a relay, say WBR, operates, it locks up and transformer BT of line B, Fig. 3, is connected to the line equalizer, the latter being connected to the input W1, W2 of repeater W, and equalizer FB being at the same time connected in the feed-back path of the repeater. As line B may also be used as an outgoing line, relay WBR also disconnects transformer BT from the selective devices on the outgoing side of the repeaters. Relay WBR further lights lamp WBL on the panel of repeater W, opens the operating circuit of relay group WAR ... WFR and operates SB which prevents the connection of any other repeater to line B until the re-set key has been pressed. Connections to outgoing lines. The outputs of the repeaters W-Z are multipled to contacts switches MOS ... QOS &c. Figs. 2 and 3, giving access to outgoing lines M ... Q &c. Each repeater has associated keys WMK ... WQK &c. one or more of which is thrown to prepare the connection of the repeater to one or more outgoing lines. Corresponding relays MR ... RR pull up and when the re-set key is thrown, R pulls up followed by MS if switch MOS is off-normal (MT not operated). Any other switch NOS ... ROS standing on repeater W also has the relay corresponding to MS operated by direct ground over a contact of the re-set key of repeater W. As a result, the switches connected to repeater W are homed over a bank such as mos 4, whereupon MT pulls up, locks, and releases MS. Switch MOS now steps by interaction of magnet MDM with relay MU until it reaches a contact from which ground has been removed by a key WMK &c. at one of the repeaters. Whereupon MU fails to operate and sluggish relay MT falls back. Lamp panels WML ... WRL at the repeaters indicate successful connections, whereupon the operator restores the operated keys of groups WMK ... WRK &c. so that MR ... RR relapse, followed by relays such as MV which remove ground from an alarm relay ALM.