A CASE STUDY ON A TOTAL TURN-KEY JOB OF DESIGN, IMPLEMENTATION, SUPPLY AND INSTALLATION OF “VHF COMMUNICATION NETWORK FOR I.H.Q OF MINISTRY OF DEFENSE

We, SANCHAR COMMUNICATION SYSTEM, were presented with a remarkable opportunity to undertake several Turnkey Projects for various government organizations. Among these, the TURNKEY PROJECT valued at 2.9 crore INR, involving the DESIGN, IMPLEMENTATION, SUPPLY, AND INSTALLATION OF A VHF NETWORK for the I.H.Q under the Ministry of Defence, holds significant importance due to its scale and the honour of supplying to the INDIAN ARMY.

Volume of Supply: Sanchar Communication System provided the following equipment:

1. 1)   30 units of 50-watt VHF Repeaters, Model: SCR-910D, each accompanied by a Duplexer, Power Supply, 6          dB gain G.P. Antenna, 30 m RF Co-axial cable, 12 Volt/65 AH secondary VRLA battery, and a 15 m Tubular          Telescopic folding Mast.

3. 2)  275 units of 25-watt VHF Base stations, Model: SCM-910D, each with a 0 dB gain G.P. Antenna, Power                 Supply, 30 m RF Co-axial Cable, External Speaker, GPS Receiver, 12 Volt/65 AH secondary VRLA battery,             and a 15 m Tubular Telescopic folding mast.

4. 3)  73 units of 25-watt VHF vehicle mount sets, Model: SCM-910D, each paired with A3 dB gain quarter-wave         Whip Antenna and 3 m RF RG-58 cable.

1. 4)  422 units of 5-watt VHF Hand Portable sets, Model: STC-904+, each supplied with a Helical Antenna,                 Battery, Battery Charger, Belt Clip, and an Operation Manual.

Additionally, the following spare items were included:

1. 1)   30 m RF Co-axial Cable – 73 units.
2. 2)  15 m Tubular Telescopic Mast – 43 units.
3. 3)  12 Volt/65 AH secondary VRLA Battery – 391 units.
4. 4)  External Speaker – 73 units.
5. 5)  GPS receiver – 73 units.

Network Implementation: To fulfill the Army’s requirements, a total of 30 repeaters were supplied, with a strategy to establish an individual network for each repeater. Consequently, a total of 30 separate networks will be set up, each corresponding to a supplied repeater, as illustrated in the schematic diagram below:

The aforementioned 30 individual networks were established across various Army areas. However, the execution of these substantial tasks was far from straightforward, as depicted in the figure.

Numerous challenges, including non-Line of Sight issues, had to be overcome by our installation team. The Indian Army was effectively able to communicate in various situations and scenarios.