Operating instructions

56 1892 1335 - Orion Radio Modem Operating Instructions - v2.9 / Aug 2009
RADIO PARAMETERS
Figure 25 - Radio Parameters tab
User Option
Radio Power can be set to High or Low. The exact output depends on the radio module
fitted. You do not need a password in order to set this parameter.
Radio Parameters
All other selections on this tab require the Radio Parameters password to be entered. These
parameters should not need to be changed unless a new radio module is installed.
Radio Module: the type of radio fitted.
Over-Air Baud Rate: selects an over-air baud rate appropriate to the radio bandwidth and
the data rate you propose to send over the air. 19200 bps can be used with a 25kHz channel,
and 9600 or 4800 bps in a 12.5kHz channel.
Comparison Frequency: The frequency used by the radio’s synthesiser to generate channel
frequencies. Effectively, the channel width.
Inverted TX audio, Inverted RX audio: Some radio modules invert the audio (modem) TX
and/or RX signal. Using these checkboxes, the signal can be restored to the original polarity
by correcting the inversion.
v Selecting SX or G-Max radios on the Radio Parameters tab automatically sets
the correct polarities (SX: Tx inverted, G-Max: no inversions) and these should
not be changed.
Low and High Bandwidth: the highest and lowest frequencies at which the radio is built to
operate.
RX IF frequency: the first IF frequency used by the receiver, and whether the local oscillator
is running at a higher or lower frequency than the received signal.