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Check your CODE settings. From your description you likely have the CODE set to a different number on the MR350 than the MD200. I would guess the MD200 is set to zero since you can hear the MR350 when it transmits. Set your codes to match one another, and turn off any special features such as call alert or Qt filtering.
Ordinarily I would post links to the user guides, but FixYa seems to be having a problem with this feature today. If you need the user guides visit giantintl dot com website.
If this doesn't solve the problem, check the frequency, code and Qt filter to be certain they are all set the same. Lastly, switch the battery packs between the units and see if the problem moves to the other unit. It takes more energy to transmit than to receive.
1) You are using the radio with another model of radio which is set to wideband channel spacing. (The TalkAbout is narrowband.)
2) You have a radio with a problem. (bad speaker, or plugged speaker grill possibly, or an internal issue)
3) The transmitting radio has a problem, or has debris or something covering the mic hole.
The only way to narrow down the problem is to have a third known good radio in the mix. This will let you know which radio is problematic. The TalkAbout models are for the most part non-repairable (other than the TalkAbout Distance models and the T7200 and T7400.)
One of the main causes of static can be a bad battery. If you are using rechargeable batteries you need to replace them every 14-18 months. If you are using alkaline batteries, they have been known not to fully power the radio once your cross the 10 hour mark. Your radio would then be operating in somewhat of a brown out. This would lead to static.
Another cause of static is simply being nearly out of range of the other radio(s).
The burst of white noise at the end of Rx on some radios can be rather annoying. On the basic talkabout radios there is nothing which can be done to solve the problem, other than replacing the radio.
The T5500 is a 2 channel radio and the T5725 is a 14 channel radio. However, the radios should be compatible with each other on FRS channels 1-14 as long as both radios are using the same Quiet Talk code. If the Quiet Talk settings are different the radios will not be able to communicate with one another.
Assuming all settings are the same (as you say) and the units are within range of each other (typically less then a mile over clear, level terrain) they should work just fine.