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MB1 User Manual
© 2016 Expert Electronics
CONNECTIONS
Warning!
i Incorrect connection of external devices and / or uncontrolled galvanic
connections could lead to the malfunctions of the MB1 transceiver or its failure!
2.5.5 Reference input
A 10 MHz external reference oscillator can be connected to the REF IN connector with coaxial
cable.
Enable the transceiver to use an external reference oscillator in the SDR software - checkbox
Use External Reference Input (more details in Options ).
Signal parameters of the Reference Frequency:
· Reference signal frequency of 10 MHz
· Reference signal voltage: min. 2.5 V (peak-to-peak) max. 3.3 V (peak-to-peak)
· Input impedance of 500 Ohm
· SMA type connector (female)
Note:
(
REF IN is used to increase the stability of the transceiver's tuning frequency, if the built in
stability +/- 0.5 ppm is not enough. It requires external reference oscillator with greater
frequency stability. Also transceiver's frequency synchronization with an external reference
oscillator is used when you want to synchronize several devices to each other, from one
reference oscillator.
(
The Phase frequency of the transmitted and received signals depends on the phase
frequency of the external reference oscillator.
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