XRef-PLL
Icom IC-756ProIII Installation Notes (Draft)
1. Overview
Most modern Amateur transceivers now generate their operating frequency from a single
internal Reference Oscillator. In many cases, this Reference Oscillator is voltage-controlled,
allowing front panel adjustment of the Reference frequency.
The XRef-PLL locks the radio’s Reference Oscillator to an external 10 MHz reference signal
from a GPS reference or other high-accuracy source. It intended to be installed internally within
the radio. When no 10 MHz reference is connected, the XRef-PLL completely disconnects from
the radio, allowing it to operate as from the factory.
In the case of the Icom IC-756ProIII, the Reference frequency is 32.0 MHz.
2. Technical Specifications
Connections to the board are shown below:
Connection
Ref 10 MHz Reference Input
0 to +15 dBm
(0.5V to 3.6V p-p)
RF Reference frequency from Radio. Radio dependent
Ctl Control output to Reference VCXO
0 to +3.3V
Test
Lock
fragile SMD components. If you do not have experience with SMD techniques, please seek
the assistance of someone who does. We are happy to provide any advice needed, but we
cannot take responsibility for any damage to your radio.
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