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I would suggest taking the radios back to a very basic programming with the interference eliminator set to zero or off, and any special features shut off. This would enclude Qt filter, call tones, iVox/Vox, vibra call, keypad tones, roger beep, enhanced scan, weather, etc. Set both radios to the same frequency and see if they work. If not, try switching the rechargeable battery from one radio to the other. Does the problem move to the other radio? If so, you need a battery. If neither of these helps, you likely need to replace the radio.
Here are a few troubleshooting ideas. 1) Check your battery installation, and clean the contacts both of the radio and battery with a pencil eraser. 2) Install fresh batteries (or swap the rechargeable from your other unit) to see if it is a battery related issue. Static is a sign of a bad or low battery. 3) Turn your CODE on to a setting and continue using the radios as normal with a CODE to block the noise. It is possible due to dropage the radio may be more sensitive to RF in your enviroment than the other radio now. It could have a possible hairline crack in the componet board, or a cracked/damaged speaker.
Check your "code" setting. You may be on the same channel, but different codes. The code is the smaller number. Check your owners manual if you have one for resetting the radio to the factory default settings. This will clear any programming issues.
Based on a quick web search the Motorola SX700 appears to be a Family Radio Service unit for use in the USA and the Motorola T5522 appears to be PMR446 radio for use in the UK. While the radios are similiar, they don't operate on the same frequencies so they won't be able to communicate with eachother. Because both FRS and PMR446 are very similiar, Motorola often markets versions of the same radio (with slightly different model numbers) for each service.