RF Neulink NL5000 Rev B0 - Manual (Page 20)

NL5000 User Manual Rev B0 19
The Settings page allows for Configuration of various parameters of the
radio. These are detailed below:
TX Pre-emphasis Allows for the signal path from AUX IN to be either pre-
emphasized or flat. Most applications where external data is being
transmitted work best with a flat response. Voice signals from a microphone
work best with pre-emphasis selected. Changing this setting changes the
gain of the audio input which may require setting a different audio input gain
on the alignment page. Factory default is flat response.
Busy Channel Lockout Prevents the transmitter from activating when the
carrier detect output is true. Used to prevent interference on a channel
where activity already exists. Not normally enabled in half duplex operation
since the transmit and receive channels are not on the same frequency.
Factory default is for this function to be off.
Test Pin (PTT) Input Logic Level Sets the polarity of the PTT input via the
TEST pin on the 15-pin I/O connector. Normally set for active low i.e.
transmitter is activated when this input is at the logic low state. Due to the
internal pull-up resistor, setting this to active high will cause activation
of the transmitter when the PTT input is left unconnected. The factory
default is active low.
TX Timeout Timer Allows for limits on the maximum time the transmitter
may be continuously keyed. When set, the maximum limit is set in the box.
To prevent overheating and possible damage to the unit, this is normally set
on with a time of 60 seconds of less. See section 5.3 for limits on maximum
key-down times. The factory default is 60 seconds.
A/B Input One or Two Channel Sets how the A/B input on the 15-pin
connector is to be used. This pin may be either used to select between the
two channels or to switch between preprogrammed low and high power
settings. When set for High/Low power, the channel defaults to channel A.
A/B Input Expanded Channels Active when expanded channel is selected
on the frequency page. The A/B input can be set to control high/low power
or set so that the unit is always in high power regardless of the A/B input
state.
Uart Rate Allows for setting of the data rate of the serial connection
between the host computer and the modem. The radio accepts port speeds
from 2,400 bps – 38,400 bps. The default rate is 19,200 bps.
RX De-emphasis Allows for the signal path from the discriminator to the
AUDIO OUT to be either de-emphasized or flat. Most applications where
external data is being sent work best with a flat response. Voice signals,