If anyone out there is thinking of purchasing one - do yourself a favor - save your money and don't. At least for now.
I have rarely, if ever, run across a product in the Amateur Radio market that I would advise others to avoid like the plague. This may be the first. The unit is innocent looking enough and after successfully using both Wouxun and Baofeng radios, it was a reasonable assumption (at least in my mind) that this little unit would be somewhat on par with those. It's not.
The JT-6188 is small, compact, and not that hard to program (using a computer). It fits nicely in the car, doesn't use too much power and the audio output coming out of the speaker is loud - robustly loud. Of course, it's controllable with the volume knob. The problem is the receive audio quality. On the dining room table, standing still, it's fine! Once installed and the car start moving? For some reason, it becomes garbled almost to the point of being unintelligible. At first, I thought it was a problem of the transmitting station not making it well into the repeater, but then I noticed even nearby repeaters with strong signals were hard to listen to while the car was moving. Switching out the Juentai with an HT revealed it wasn't an antenna or transmission line problem.
As a tiny little base rig - this is not a bad little unit. It has more "oomph" than your standard HT - about 20 Watts out at the High Power setting. As a mobile radio - it stinks, badly. A little "after the purchase" research revealed others reporting the same problem - but interestingly, others not. As always, hindsight is 20/20, and I guess I was blinded by the low price and convenience factor of not having to run power cables through the firewall to the battery.
I'm not going to toss it, as I can probably find a use for it someday. But it won't be in the car, and I guess I'll go back to using an HT connected to the external antenna along with a speaker mic.
72 de Larry W2LJ
QRP - When you care to send the least