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Re: changing the frequency
First thing I ask individuals is "have you read the manual?" this will walk you step by step through the procedures for changing frequencies. If you have done this and they still don't communicate with each other, it may be that you have a VHF version of radio and they might have a UHF version of radio or visa versa. The other possibility is that they might have purchased higher teer radios that are programmed for them by a local radio shop. The information you have provided leaves a lot of possibilities to the answear. I would need to know what model radio the campground has.
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This one is new for me, so if you posted elsewhere, bear with me. You changed the frequency, I assume to match another radio. Now you must also change the Tone, called PL, DPL,or CODE, etc. Both frequency and tone must be EXACT. Such as Frequency 2, code 1. which is default channel 1 on UHF radios. Also be certain you are not trying to match to an RMV radio, and RMV and RMU cannot talk to each other.
If they're not exactly the same model they may have different channel indexes. If the "oddball" is a combination FRS/GMRS or if the other 3 are, they'll have different numbering. As long as you can talk between all of them, just make note of the "right" numbers when they're working.
Unfortunately the T5728 is not compatible with the US FRS (family radio service) frequencies. The T5728 operates between 409-410MHz. The FRS radios operate between 460-470 MHz. FRS frequencies are license-free frequencies for use in the US, as regulated by the FCC. Other countries have differing rules and thus their frequencies assigned to family usage differ.
fyi my Cobra microTALK LI7500-WX came out of the box with one of the radios slightly off frequency, limiting range to about 100 ft. I was able to use a counter to fix it. The freq adjust is under the front faceplate that covers and protects the LCD screen, pry it off to expose one tuning pot.