You need to program the correct frequency. the Marine Channel 63A is 156.175Mhz. they also maybe using a PL Tone or a CTCSS tone, you have to find out what it is. using the Chirp Programing software you can do that. but remember sometimes a Cities use a non standard CTCSS tone so you can only hear each other
SOURCE: reception of vhf/uhf channels
You did not mention which set you have, so look for a small switch (usually on the back of the set) or go into the menu and set the TV to the "broadcast" or "tv" mode. If the set is in the "cable" mode, you will not get any UHF channels above 13.
SOURCE: my customer has 6 motorola max trac vhf radios.
If this is a new install, it is likely noise from the vehicles electrical system scrambling the processor of the radio. Put a filter on the power leads and check your install.
SOURCE: Navman VHF 7100 Radio neither receiving nor transmitting
I would suggest checking your antenna/coax connector. I am not sure what kind of antenna or ,mount you are using but I would suspect it being something in the antenna. Most radios are designed to not transmit if the antenna is broke or not connected at all. When you say bent do you mean metal bent or bent at the base? So that would be where I start. Can you try a different antenna? Hope you track it down. N5ARK
SOURCE: Motorola Talkabout FV700 not transmitting nor receiving
had the same problem...took out nimh...replaced with triple A...works great!!
Thank you!!
Your radios could be programmed with subaudible tones (CTCSS) or digital code squelch (DCS) which the new radios do not have. They can be programmed for it, you need to find out what tone/code you are using.
It could also be that your existing radios are programmed for a "duplex" repeater channel, with different transmit and receive frequencies. The new radios might be on the "repeater output" frequency so they would not activate the repeater.
Both could be the case, missing tone and duplex frequencies.
I would check the programming of the new and old radios, especially for tone/code squelch.
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