Page 53
E Series Ethernet Radio – User Manual
Version 08-10
Tx/Rx (Frequency) Trim
The currently selected frequency trim, which is common to both
transmitter and receiver, is displayed in the main window below
the button in Hz. The frequency trim can be adjusted live by
selecting this button which displays a dialogue box. The up/down
keys can be used to select the required frequency offset in steps
pre-determined by the radio modem. Selecting OK will retain
the frequency trim setting. Note that although the frequency
trim has been adjusted it must be written to NVRAM using the
modem “Write” function to ensure it is retained after the modem is
rebooted.
This facility permits correction for drifts in the frequency reference
caused by component aging. For example, a standard crystal
may vary in fundamental frequency operation over 1 year by one
part per million. An adjustment range of ± 10ppm, displayed in Hz,
has been allowed for and if this is insufficient the unit should be
returned to the dealer/factory for re-calibration.
Advanced
System Parameters
This section of the main window configures the PTT control,
collision avoidance, stream setup for routing of data, advanced
features and provides unit information.
PTT (Press To Transmit) Control
RF transmission can be configured to occur permanently,
automatically on data received on the Serial Port, or RTS
being asserted on the Serial Port. A PTT timeout facility can be
configured to limit the period for which the transmitter is enabled.
Each option is selected by setting the control to the left of the
description on the main window. When PTT is active the “Tx” LED
on the unit is illuminated and RF power is being fed to the antenna.
Permanent Tx
This will cause the transmitter to be permanently enabled (keyed)
and displays another dialogue box warning the user that the
transmitter will be energised immediately after the configuration
is written to the unit. Selecting OK confirms this setting. The other
PTT selections are disabled when this option is selected.
Note: This option is only available for full duplex units when being
programmed locally.
Auto On Data
This will cause the transmitter to be enabled (keyed) automatically
on data received at the Serial Port and included in a complete
frame for transmission over the radio channel. The maximum
period for which the transmitter will be enabled is limited by the
PTT timeout setting.
From Serial Port RTS
This will cause the transmitter to be enabled (keyed) on Serial Port
RTS being asserted. The maximum period for which the transmitter
will be enabled is limited by the PTT timeout setting. Applications
which rely on establishing a link ahead of data being transferred
require this method of activation.
Part I – TVIEW+ Management Suite - Programmer
Receiver Full Duplex
This check box should only be ticked when the radio is operating in
“full duplex” mode and with a “full duplex” hardware platform. For
standard half-duplex remotes this option should not be ticked. For
other modes please consult the factory for further information.
Note: This parameter is set in the factory to the correct state and
should not be altered without factory consultation.
Legacy Modulation Schemes: Some modulation types are
specifically for backwards compatibility. This includes D Series
compatibility mode. These legacy modes should only be chosen
when backward compatibility is required as their performance is
inferior to the generic modulation schemes (bandwidth and RF
sensitivity).
