RF Neulink NL5000-T - Manual (Page 19)

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TX Pre-emphasis-Allows for the signal path from AUX IN to be either pre-emphasized or flat.
Most applications where the AUX IN input is used work best with a flat response. Factory default
is flat response.
RX De-emphasis-Allows for the signal path from the discriminator to the AUX OUT to be either
de-emphasized or flat. Most applications where the AUX OUT output is used work best with a
flat response. Factory default is for 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.
Squelch Enable-Allows the receive audio paths to be muted when the carrier detect output is false.
Used to prevent the output of noise from the audio outputs when no signal is present. Due to the
finite squelch attack time, some high-speed modems work best with unsquelched audio. The
factory default is for this function to be set for never mute.
DCD Output Logic Level-Allows the setting of the polarity of the DCD (Data Carrier Detect)
output. Active high means that the true state is a logic high while active low means that the true
state is logic low. Normal setting is active high. The factory default is active high.
Carrier Mode-Allows the programmer to set the radio to match the type of carrier detection used
by the RF board. The carrier detect mode may be either RSSI (Receive Signal Strength Indicator),
based upon carrier level or Noise, which is based upon the receive signal to noise level. RSSI
based is significantly faster than noise based systems and is usually preferred for data applications
where fast turn-around times are important. This selection must match that of the radio
hardware. It is preset at the factory to match the RF board and must not be changed unless
the RF board is modified. See the Hardware Options section under Maintenance in this manual
for details. The factory default is RSSI mode.
Audio PA TX Sidetone-When enabled, the Audio PA is turned on during transmit and has at its
output the signal to be transmitted as a sidetone. The factory default is for this function to be off.
RX Discriminator Coupling-Selects whether the coupling from the discriminator output on the RF
board is AC or DC coupled to the control/loader board. Since the audio outputs of the
control/loader board are AC coupled, this function is normally set for AC as well. For response to
DC, a hardware jumper options can be made for DC coupling at the AUX OUT. (See the
Hardware Options section under Maintenance for details on this option.) If this is done, this
function should be set for DC. The factory default is AC.
CSN Input-Selects whether RNET Compatibility mode is to be used. See section 5.5 for an
explanation of this function. Normal operation is to set this for high/low Power. The factory
default is high/low power mode.
PTT/RTS Input Logic Level-Sets the polarity of the PTT/RTS input. 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/RTS
input is left unconnected. The factory default is active low.
CTS Output Logic Level-Sets the polarity of the CTS (Clear-To-Send) output. Setting for active
high caused the true logic state to be high. Active high is the normal setting. The factory default
is active high.
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