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Check your PL/DPL settings among the radios. You may not have them programmed the same as one another. PL (aka private line) blocks out other users who do not have the same code as one another. Your radio which receives could be set with no PL code and it receives and hears every thing, so it would hear the other two, but not talk to them if they have a PL code setting.
Another way to check this is typically the dealer who programmed them will have the side button directly under the PTT programmed for Monitor. If you press this button a short press you should temporarily go into "open squelch" and you would be able to hear everything on your frequency. Try pressing this button on one of your "two" radios and see if they can hear the "one" radio. If so, you know it is a programming issue. (provided the button is programmed to Monitor). If pressing the Monitor button does not allow temporary communication, you have another issue.
If the green light on the radio seems to come on and stay on continuously, the radio is in need of repair. (Average flat rate repair on tehese BPR40s are around $79 currently at many repair centers.)
You can always have a radio receive. To transmit require an FCC License, and you need authorization to "Talk" to Public Safety. There are large fines and possible jail time to talk on channels you are not authorized for, especially Public Safety. Sadly, your radio is programmed to monitor only when the button is held down. The frequencies in your area working are a lucky coincidence. Take it to an Authorized Motorola Dealer and pay to have it reprogrammed. Radio is not field programmable. Hold onto your wallet, they are expensive to have programmed. You should have bought a high end digital scanner.
See if the one radio that doesn't hear the other has a PL tone programmed into it. If both radios are not programmed to the same PL tone, then one will not hear the other. Consult your owner's manual on how to do this.
You would need two or more radios to be able to communicate with others. Then you simply press the push-to-talk (PTT) button when you want to talk (transmit) and release it so others can reply (receive). The radios must be set to the same settings to be able to communicate.
What is happening is your T6500 is set to ignore radios which do not match the same code. The fact your Cobras can hear the T6500 indicates they are set with their interference eliminator turned off (aka no code).
A similar occurance will happen if the Qt filter is set to anything but zero. The Qt filter is unique to Motorola. These features are beneficial when you are in a high radio traffic area and you want to block out hearing other people. But in your situation, you are mixing radios, and the easiest way to make them match is to turn off the special features (aka set them to zero).