●
tune UV-3R to the frequency located few steps above
●
make sure SQL/squelch is set to one
●
make sure no CTCSS/DCS are set
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switch UV-3R off
●
open up the UV-3R as described elsewhere;
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solder about 10cm of wire in place of the antenna connector
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connect the earpiece
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connect the charger to UV-3R, the radio will power up
●
gently lay the bare board on the flat, non-conductive, surface
●
using a plastic needle gently press down components until the squelch opens
Congratulations, you have successfully identified the fault. Now you need to fix it, but that
requires an expert technician and specialized tools.
My VHF/UHF transmitter does not work
RF is generated by the SDR chip inside UV-3R. Then applied to a buffer stage and switched to
a dedicated amplifying chain, one per band. Each amplifier is composed of a driver and a final.
Can you hear your transmission on a nearby receiver? Is there a difference between high and
low power? Do you get the expected power on the other band? If so, the SDR chip is working
and the fault is in the amplifier chain.
Could it be that there is a cold solder joint in the VHF/UHF transmitter chain?
TBC
What is the strong signal on 156 MHz?
The carrier on 156.000 MHz (marine channel 0) is caused by the 6th harmonic of the internal 26
MHz oscillator. This oscillator is used to run the main radio SDR chip so there is no cure.
Other spurious signals can be heard on UHF as well, every few MHz. Fortunately they all stay
out of the HAM bands.
The FM radio does not work
Hold the orange button on the side for about 2 seconds to get into FM radio mode. When FM
mode is attained “FM” will appear on the lower left side of the display. Hold it again for about
2 seconds to get back to UHF/VHF mode. The letters “FM” will disappear when you exit “FM”
mode.
You can store favorite FM stations just like you do for VHF/UHF memories. Scanning through
the FM band for stations is like scanning in VHF/UHF.
Don’t forget to connect an antenna to the UV-3R!
UV-3R FAQ v. 2012-01-27
Page 27
