For any reason these radios lost communication in the floor near a range of 60 feet open area, employees have to move to a range of 40 feet in the center of the area to get good signal. Batteries are good antenas are good, frequency settings are good. They work fine in the beginning, so I am thinking that something external in the area is afecting the signal. Is there something else that I need to know?
Loss of range usually indicates a programming problem, such as having the radios on a near, but not exact frequency; or issues with the antennas. Check your programming and see that the frequencies/PL codes match one another, and that the users are on the same channel as one another when using the radios. Also check the power output setting (if it is visible to you in the programming software). These radios even on low wattage should be able to talk line-of-sight up to 2 mi. However, with VHF any obstacles greatly reduce the range.
If the radios worked fine in the beginning, and are failing now, you have to think back to what might have changed along the way. If you feel no changes have been made by you or the users, then you may have a bad radio in the mix, and it needs repair. (Flat rate usually around $85 USD)
It is doubtful their is anything external effecting the range. If you had radio interference, you'd likely have problems with static, general noise, and your radio's receiver opening up even when no one is transmitting.
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