SATEL-EASy+
User guide
Version 1.33
30
6 RF INTERFACE
All modem types have a single TNC female type antenna connector with impedance of 50 Ohm.
SATEL-EASy+ offers the radio settings for user to select:
• Channel spacing: 25 kHz, 20 kHz, 12.5 kHz or 6.25 kHz *
• Frequency can be any 6.25 kHz divisible frequency between 320…380 / 403…473 MHz in
case the Channel Spacing is 25 kHz or 12.5 kHz
(example 403.000 MHz, 403.006250 MHz, 403.012500 MHz)
• Frequency can be any 10.0 kHz divisible frequency between 320…380 / 403…473 MHz in
case the Channel Spacing is 20 kHz (For example 403.000 MHz, 403.010 MHz, 403.020
MHz)
* Supported only in 320-380 MHz variants
The data speed of the radio interface depends on the radio channel spacing, see chapter 3 in
table Data Modem, section Data speed of Radio Interface.
The data speed over-the-air is irrespective of the data speed of the serial interface. If the two
differ from each other, the radio modem will buffer the data (max 1 kB) temporarily.
Please note that any communication link introduces an extra time delay called latency that
affects the system performance. It is the minimum time experienced by the data between the
moment when the data appears at the serial interface of the transmitting modem and the
receiving modem. Appendix B presents measured transfer delays in details.
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