I have a pair of t5522 which have always received signal from other handsets and models if on the same frequency. I have recently gained 2 new t5720 and have problems communicating between models. If both t5720's are on then a t5522 will be able to receive but not send unless I turn on the other t5522. This problem also occurs vice versa. Any ideas?
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Try swapping the known good battery out of your working unit and see if that solves the problem. If so, replace the battery pack. If this is not the problem, unfortunately your best option is to replace the one unit. Parts and schematics were never made available for this model.
These are mass produced radios which although serial numbered inside under batterys - it is very unlikely that you will trace an owner. cheap and cheerful radios dont usually attract the effort to register
One further thing to check would be the Qt filter.
If the frequency, code and Qt filter are all set alike, and the radios still do not function together, you likely have a defective radio. The only way to determine if one is bad is to introduce a 3rd radio into the group, and the bad radio will be apparent right away.
Check the Continuous Tone Coded Squelch (CTCSS) settings on all the radios. (Note that some manufacturers refer to this feature as a Privacy Code or Quiet Code. The actual name of the feature may vary.) This feature encodes a low-frequency signal on your radio transmission. This signal is below the range of human hearing but can be detected by other radios. When the CTCSS feature is active your radio will ignore any signal that it receives that does not have the proper tone encoded on it.
In order for these radios to communicate, all of the radios need to be on the same channel and have the same CTCSS code programmed or the CTCSS feature must be disabled.
I suspect that CTCSS is activated on one of your radios but not on the other. This would result in the situation you describe.
Also take note that when using different brands / models of radios to communicate with one another that the CTCSS code numbering scheme may not necessarily be the same from radio to radio. For instance, CTCSS code 4 on the Motorola TalkAbout series actually corresponds to code A on the Motorola Sport models.