Involvement:Expert (understands the inner workings) - Ownership:1 week to 1 month
* Cheap * No soldering required * Antennas included * Excellent build quality * Charging from USB port (cable not included)
* Transmit power is low. Even cheap smartphones overcome it in the city with dense network coverage, The legendary Nokia 3310 don't even notice it. * No manual at all. Thank FSM, I have some lab equipment to find out how to power it optimally. * GSM band antenna is inefficient. I replaced it with handmade dipole, and that one impressed even N3310.
Heat dissipation is a topic for thought.
In city conditions it is really useful within 0.5-1.5m. Enough for usual car, but not enough even for minivan.
Power requirements found in my tests: 5V 500mA. USB port fits it.
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