I have a new pair of 5500. It seems not working, but I discover that using channel 1 in one and channel 2 in the other they work, the same if using channel 2 in one I have to select 3 in the other, it is like a frecuency error. Maybe is the same with yours.
I had the same problem, I solved it my holding down the PTT button on one and the scan option on the other. It seems that the channel indications are faulty and and Channel 1 on one matches with Channel 15 on the other and so on. But once this was sorted the units work fine.
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This problem is typically caused by small component behind the PTT button being cracked or broken. The RDX series radios respond best if the user presses the PTT button in the center versus the top or bottom sections of the button. Once the button becomes hard to press it is best to get the radio repaired. Commonly if the radio remains in use the PTT issue will get worse as the internal PTT component is pressed harder, pushing it further away from the outside button and eventually loosening it from the component board.
It thinks the channel is "busy" when you hit the button. Set the squelch control until it doesn't hear a signal if there's no intelligible signal present, or set the CTCSS tones to a valid value for your system. The EPH is a very good radio, but generally takes an experienced technician to program it properly.
A couple of thoughts:
1) Check the mic hole and see if it is covered or clogged with debris.
2) Does your PTT button seem hard or the opposite, mushy? You could have an internal PTT issue. The PTT is a common failure part on 2-way radios. Feel around for the 'sweet' spot and see if you can make a simple or partial transmission, or if it will even momentarily open up the receiver on the other unit. If so, your radio is in need of repair. It would likely need a new internal PTT. (At most repair centers where the BPR40 is repaired the flat rate repair currently are around $69 for the BPR40)
3) Has any reprogramming been recently done on the radio? If so, double check the programming to be sure your PL/DPL code is set the same as your other radio.\
4) Check your battery. Trade batteries with the other unit and see if the problem changes. It takes more energy to transmit than to receive.
Hold the push to talk(PTT) button while turning the unit on, it will talk to you. press PTT to change channel, push monitor to switch to codes, press PTT to change codes. When you have the correct settings press monitor and it will confirm settings.
The flashing light can be an indication there is activity on the frequency the radio is set to. Pressing the monitor button should give you the white noise (static) sound, so this function is working correctly. This also tells us your speaker is working fine, as well as your volume. The typical reason you cannot go into programming mode (when you hold the PTT in while turning on the radio and hear the female voice announce your frequency) is a bad or moved internal PTT switch. This typically happens over time as a user presses ever harder on the PTT to communicate. However, this does not explain why you are not receiving. This could simply be a result of an incorrect PL code in conjunction with the bad PTT. If you have a frame removal tool, you can extract the component board and physically look at the internal PTT. You can then hold in the very small button and program the radio to the frequency/PL you desire. If you are needing the radio repaired, you can get this style unit repaired for around $69 flat rate
Not certain what order you are doing it, so I will type a brief explanation:
With the radio turned OFF, hold in the PTT and the MON, while turning the radio on. Continue to hold the PTT and MON until the radio stops making noise. You are then in programming mode and can use the menu button to walk through the stages of programming.