Users Manual

MDS 05-6399A01, Rev. G MDS™ Master Station 45
- x710 – When using the Master Station in a legacy x710 network.
- Transparent – With and without AES Encryption. (Transparent w/AES Encryp-
tion requires an all SD radio network.)
• Modem Type – This setting determines the over-the-air data speed and bandwidth of the
radio’s transmitted signal. All radios in the network must use the same modem setting to
communicate with each other. The default setting is Modem 9600, but it may be set to any
of the selections shown in Table 5-2. Modem Selection vs. Speed, Bandwidth &
Sensitivity. The table also lists modem sensitivity ratings for the various modems. Note
that some modem choices are limited based on the model purchased.
• RF Output Power (dBm) – The RF output power may be set between 30 and 40 dBm (1
to 10 watts) in 1 dBm increments. The default setting is 40dBm. This setting represents
the output power at the Radio Module. Output power at the antenna port on the back of the
unit will be roughly 2dB to3dB less depending on configuration. This is due to cable,
switching, and duplexer losses. Full power is not required in many cases, and lower
settings will place less demand on the power supply and reduce the chance of interference
with other stations. Only the power necessary to carry out reliable communications should
be used.
• Transmit/Receive Frequency – The receive and transmit frequencies may be viewed or
set here. Frequencies must be entered for the radio to operate. Consult your station license
to determine the authorized frequencies for your system, and enter them exactly as listed.
• Keying Mode – Keying mode must be set to one of the following values:
- Data – Radio will key upon receipt of payload data.
- RTS – Radio will key upon receipt of an RTS (request to send) signal on the se-
rial port.
RTS keying mode is only supported when the radio is in x710 mode.
- Data or RTS – Radio will key upon receipt of either payload data or an RTS (re-
quest to send) signal on the serial port.
- Continuous – Radio will be continuously keyed. This is primarily used in a trans-
parent streaming repeater configuration.
Continuous keying mode is only supported in x710 mode, or in transparent mode
when operating as a repeater.
• System ID – Provides the possibility for Frequency Re-use. System ID offers nine unique
choices including the default value of NONE. The setting NONE is required for mixed
networks comprised of MDS legacy and SD products. SD-only networks can utilize the
Frequency Re-use feature by setting the System ID to a common value [1-8] for all radios
in a specific network. System ID offers approximately 20 dB of additional co-channel
isolation when operating networks on the same frequency. Note that proper system design
is required.
Operational Example: SD System “Alpha” has eight units and SD System “Beta” has
eight units. A user wishes to occupy frequency 952.1235 MHz on both of these systems.
Proper system installation has been adhered to in both networks. System Alpha’s units
would all be set to System ID = 1, System Beta's units would be set to System ID = 5.
Both systems will now operate on the same desired frequency.
Examples of valid and invalid arrangements are shown in Figure 5-3 and Figure 5-4, re-
spectively.