Epsilon Electronics, Pvt. ltd Hyderabad, Telangana

This Push Button Magneto Telephone is similar to the Rotating Type Magneto Telephone, but the Ring Generator is Electronic and appears across the Lines as along as the ‘Press To Call’ (PTC) button is pressed. It works on 6VDC supply from 6V, 1.2 AH Ni-Mh Battery provided inside and a charger working on 100 - 300VAC, 50 Hz. Provision is given in the Rosette Box to connect external 6VDC SCOPE : The Push Button Magneto Telephone Model MTI 201 is used for Point to Point Communication for a distance of 10 Kms., when the diameter of copper conductor is 1.5 mm Sq. CONSTRUCTION  : The Telephone is Desk Type, housed in ABS (Acrylonitrile Butadiene Styrene) Plastic Moulded Body (Cover and Base) and Handset. It has Electro Dynamic Transducers for Transmitter and Receiver. It has Coiled Cord and Straight Cord, a Rosette Box for connecting Line and external Power Supply (if required). The Ring Generator, Ringer, Induction Coil and other Speech Circuitry are wired in a PCB of 1.6mm thick FRP Printed Circuit Board. A standard hook (Cradle) Switch provided disconnects the incoming Ringing Voltage when lifted. To call the handset has to be on the hook. A Press to Call (PTC) Switch is provided on the top for Calling and a Press to Talk (PTT) Switch is provided in the handset. TECHNICAL : (1) Ring Generator : Frequency : 25 ± 5Hz Output : 60VAC max. (2) Speech : Tx : 0dB across Lines Rx : -12dB POWER SUPPLY : The Telephone works on 6V DC supply from a 6V, 1.2 AH Ni-MH Battery provided inside. A Socket is provided at the back of the Telephone Body to connect a charger working on 100-300VAC, 50Hz. A hinged metal door is provided on the top of the Telephone to replace the Battery as and when required. The external voltage connection provided in the Rosette Box can accept a maximum of 6V DC only. CONSUMPTION : Idle : 3mA Conversation : 15mA Ringing : 300mA INSTALLATION (1) Open the Rosette Box and connect L1, L2 between one phone and the other. (2) Open the cover of each Battery Box on top cover and slide on ‘ON’ the Switch provided inside the compartment. (3) The Power ON LED shall glow. Replace the cover. (4) Press the Call Button and ensure that the other phone is ringing. All this time, the calling handset has to be on the hook. (5) The Charger can be connected as and when the Battery Voltage is low. The Charger has a LED which goes off when the Battery is fully Charged.

As per the Specification Clause No: 3.0 The Way Side Telephone consists of Desk Type Telephone Power Supply-Cum-Charger M.F. Battery of 12V, 7AH 6 Pin Plug Assembled in a Wooden Box and this weights over 7.5 Kgms. As per the field user’s report it is too heavy to carry and they expressed that this should be of light weight.  Keeping Customer Satisfaction on priority our R & D team developed a Light Weight Telephone working on 3Vdc with a Lithium-Iron Battery of 3.6Vdc, 900 mAH with a suitable Charger working on 100-300VAC, 50Hz. The Battery can be used for 20 hours continuously on full charge. The performance of the Samples are tested and found to be meeting all the parameters as per the above Specification.  The weight is around 900 gms. including the Charger, 6 Pin Plug and carrying Pouch

Automatic Radio Patching System for Control / Far Ends using DTMF Signalling for OFC System with Dedicated / Without Dedicated Channels. Control End Relay kept in Control Office Works on 12V DC and the Distance End Relay kept in the OFC Building works on 48V DC. This unit is optionally available for Control End / Far End with or without 4 Way Branching Network. WEIGHT  : 12.0 Kg. (Approx.)

The Signal Post Telephone (SPT) consists of : Master Telephone in Assistant Station Master’s Cabin (MT) Slave Telephone fixed on Signal Post (ST) SCOPE : This is similar to the above, but due to heavy induction in the cable due to 25KV AC overhead lines, it has separate Power Supply with the Slave (24VDC) and it has specially designed filter to remove the induced voltage in the cable. MASTER TELEPHONE (MT) : This is kept on the Desk of the ASM to facilitate communication between ASM (MT) and the loco driver (ST) for controlling movement of train. This consists of a Microphone Amplifier, Loud Speaker and a Press To Talk Switch. The Master (MT) and the Slave (ST) have separate power supplies of 24VDC each. Provision is given on the front panel to adjust the output level by using a Potentiometer.