User's Manual

RRCFSK, 4FSK, etc., DC coupling may be indicated, even if the output of the unit is not modified for true
DC coupling to the output. AFSK modulation types such as Bell 202, etc. should use AC coupling. The
factory default is AC.
CSN Input-Selects whether RNET Compatibility mode is to be used. See section 5.6 for an explanation of
this function. Normal operation is to set this for high/low Power. The factory default is high/low power
mode.
High Pass Filter-When RX Discriminator Coupling is set to AC, this box is enabled. This box allows a
choice of two rolloff frequencies for the lower high-pass rolloff. The 250 Hz selection may attenuate
certain types of data signals and cause tilt on square waves, but is the fasted at responding to changes in
discriminator DC level caused by frequency errors on either the receiver or the receiving transmitter. For
better low-frequency response, 50 Hz may be selected.
CSN Input-Controls the function of the CSN pin. This pin can be used to select one of two transmitter
power levels in the High/Low Power position or can be used to select one of two channels in the RNET
Channel 1/2 mode. See Section 5.6, RNET COMPATIBILITY MODE for details on this selection.
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.
Monitor Polarity-The monitor input is used to override the action of the receiver squelch (mute) when
squelch is active. This function sets the polarity, active low or active high, of this input. When active,
squelch is disabled, even is enable via the Squelch Enable setting above.
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.
Green LED-Sets the operation of the green LED on the front of the radio. The choices are:
a. Off-The green LED is never on.
b. Power ON-The green LED is on whenever the radio is powered up.’
c. Carrier Detect-The green LED is on whenever a carrier is detected that is above the
programmed carrier detect on threshold.
d. RX Synthesizer Lock-The green LED is on whenever the frequency synthesizer is locked while
in receive mode. This is the factory default setting.
Red LED-Sets the operation of the red LED on the front of the radio. The choices are:
a. Off-The red LED is never on.
b. RX-The red LED is on whenever the radio is actually transmitting. This is the factory default
setting.
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 5.4 for limits on maximum key-down
times. The factory default is 60 seconds.
6.5.3 ALIGNMENT
The alignment page is used for setting the values of the digital gain settings which are used for aligning the
unit and setting the gains of the audio paths. The unit leaves the factory already aligned, but the user may
wish to change the values of some of the input and output gain settings. Different systems or modems may
require different input and output levels.