Operating instructions

RF Technology R50 Page 15
Then it will ask the operator to enter the value of Vref (as measured at TP913, see
5.7).
Measure the voltage, at TP913 (Vref)
and type it on the command line...
Unless the reference diode D911 has been replaced, this should not be done. The user
should simply hit the Enter key to bypass this operation. If, though, D911 has
been replaced for some reason, then, the lid of the unit should be removed, and
the voltage measured. TP913 can be found just above JP12 (near the centre of
the exciter).
Then the receiver low battery alarm level will be asked for. If the current value is
acceptable, the User need only hit the Enter key on the keyboard. If another
value is preferred, then that value can be typed in.
For example:
The Exciter's Low Battery Alarm is 24V
If this is correct enter <RET>,
else enter the new value: 26
In this example, the low Battery Alarm level is changed to 26V.
Then the user will be prompted for serial port baud rates, etc. Please leave these
parameters unchanged unless you are familiar with how to change such
parameters on your PC. The WinTekHelp software will expect 57600 BPS,
and No Parity. Note well, that if you do change any of these, the change will
not take effect until you power down the receiver and then power it up again.
(As an alternative to power cycling the receiver, and if the cover is off the
receiver, you may simply press
switch momentary push-button S200 (see 5.2).
Then the following questions are:
Is Flat frequency response on by default (Y/N)?
Is COS purely a sink of current (Y/N)?
Is COS Asserted when the Squelch is closed (Y/N)?
Is COS UnAsserted when the Squelch is open (Y/N)?
Is LOOP Asserted when the Squelch is closed (Y/N)?
Is LOOP UnAsserted when the Squelch is open (Y/N)?
Always hit "Enter key" unless the value other than default is required. Note the user
should use the "Y" key if the default value needs to be changed.
6.4 Line Calibration Procedure
R50> cal line
This procedure is used for calibrating the RF RSSI level reading, FM modulation
(deviation) reading. Also this procedure is used to set the 600 Ohm audio line
output level, Noise squelch level and Carrier squelch level. Simply follow the
instruction of the software as bellow:
Attach an RF signal generator to the input.
Set the RF output to 37.5MHz,
and an input level of -110dBm
with a 1kHz tone and 3kHz deviation.
Adjust the Volume Pot until the DIR AUD output