make sure CTCSS is off on both radios, and make sure your on the proper channel to transmit.
Also, if you plan on using CTCSS, the GP68 has a few extra channels than the talkabout so you'll need the conversion chart.
for example channel 2-12 on your talkabout would be 462.5875-13-13 (there are 2 subchannels on the GP68, listen and transmit)
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