A B Distance: 30 meters

A C Distance: 150 meters

C D Distance: 100 meters

P A Distance: 40 meters  Angle: 30∠ Height Distance: 10 meters

P: Iron-made house, signal block

Tunnel diameter about 2 meters,signal attenuation large

Approved Solution :

PoC Radio TH-288/TH-388/TH-682 + PoC Analog Repeater TM-990D (RX: 467.65MHzMHz TX: 457.55MHz) at place C + 10W TH-850plus(RX: 457.55MHz TX: 467.65MHz)

1. Place C install PoC Analog Repeater TM-990D. PoC antenna outward, analog antenna inward

2. Tunnel outside use TH-288/TH-388/TH-682

3. Tunnel inside use TH-850plus

Field Test Result: 

Communication between A D is good

Communication between tunnel inside and outside is good

Remarks:

Set TX/RX at different frequencies is prepare for second turning. If the tunnel dug deep to place E, can install analog repeater TA-RS01 at place D to extend Analog radio’s communication distance.

Failed Solution 1:

PoC Radio TH-288/TH-388/TH-682
Field Test Result:

PoC radio will off line if go 10-15meters further after first turning(place C)

Failed Solution 2:
10w TH-850plus (RX: 457.55MHz TX: 467.65MHz) + Analog Repeater TA-RS01 at place B

Field Test Result:

1. Communication between A C is good.

2. Place P received signal is very weak from repeater TA-RS01(place B). It can not even receive if have an interference.

3. Can not communicate if go a few steps further after first turning(place C)

Failed Solution 3:

10w TH-850plus (RX/TX: 440.55MHz)

Field Test Result:

1.A to C: can not communicate at the first turning

2.P to B : can not communicate if go further inside