Specifications

MDS 05-3438A01, Rev. E MDS 4790/9790 Series I/O Guide 49
Receive Frequency RX [xxx]
This command displays or changes the radio’s receive frequency. Nor-
mally, the radio will be shipped to the customer programmed with the
customer-specified frequency. If the operating frequency was not spec-
ified when the radio was ordered, the RX frequency is set to the center
of the radio’s operating band (see Section 2.6, Model Number Codes,
beginning on Page 6 for the model’s operating band).
If the receive frequency is changed more than 5 MHz from the factor’s
setting, the receiver’s front-end helical filters must be re-tuned. If the
transmitter frequency is also going to be changed, please review the
duplexer guidelines in Section 8.4, Operating Frequency Change Con-
siderations, beginning on Page 85 before implementing any change.
Received Data Audio
Level
RXLEVEL [–20 to +3]
The RXLEVEL and TXLEVEL (Page 55) commands control the audio level
settings when the radio is operating in analog mode. When used alone,
the
RXLEVEL command displays the receive level in dBm. Entering the
RXLEVEL command followed by a number from –20 to +3 resets the
audio level in dBm.
NOTE: Operable only on the “A”/analog model radios.
Receiver Muting RXMUTE [ON/OFF/Time in msec]
This screen is used to set or display the radio’s receive (RX) muting
status. Receive muting may be required when the radio is configured as
a full-duplex polling remote communicating through a repeater. It pre-
vents the radio from hearing its own transmissions (“echoes”) via the
repeater, which can cause errors in some software applications.
Entering the
RXMUTE command without a parameter shows whether the
muting feature is
ON (enabled) or OFF (disabled). Entering the RXMUTE
command followed by
ON enables muting; entering OFF disables it.
After the
RXMUTE ON command has been issued, a receive muting time
may be specified. This is accomplished using the
RXMUTE nn command,
where
nn is a time in milliseconds. This causes the receive muting fea-
ture to be asserted for nn milliseconds following the end of a transmis-
sion.
Receive Frequency screen,
Page 65
A
B
Receive Level [–20 to +3] screen
Page 71
A
B
RX Mute Mode screen, Page 65
A
B