24
MB1 User Manual
© 2016 Expert Electronics
CONNECTIONS
Warning!
i
I ncorrect connect ion of ext ernal devices and / or uncont rolled galvanic
connect ions could lead t o t he malf unct ions of t he MB1 t ransceiver or it s f ailure!
2.5.5
Reference input
A 10 MHz external reference oscillator can be connected to the REF I N connector with coaxial
cable.
Enable the transceiver to use an external reference oscillator in the SDR software - checkbox
Use Ext ernal Ref erence I nput (more details in
).
Signal paramet ers of t he Ref erence 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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