Technical Manual
MX800 Transceiver T19 Option
1.4.5 Variable & Stepped Tone Encoder Setup Procedure
This section provides a set by step approach to enable the option board for uses as a Variable
Tone encoder T26
1.4.5.1
Variable & Stepped Tone Encoder- Programming
1.
Connected option Board via the Rs232 port, run terminal software.
2.
Type "RMENU
↵
" to access inbuilt software menu.
3.
Select Configuration Menu (C)
4.
Select encoder Menu (E)
5.
Select the type of encoder required.
6.
Press the Escape Key.
1.4.5.2
Variable & Stepped Tone Encoder- RX Alignments
1.
Using a 600ohm termination monitor RX line output level. This output is located on the rear
of the MX800, RJ45 Line I/O connector pin 1 & 2 (balanced audio)
2.
Remove JMP20
3.
Set the receiver modulation frequency to 1 kHz and the FM deviation to nominal for the
particular RF receiver frequency of the test channel. At a RF level of –60 dBm.
4.
Adjust Line Output level RV4 to obtain nominal line output level (-10dBm is the default
level).
5.
Set the RF level to 0.6uV (-111.4dBm) on the comm.’s test set.
6.
Using a DVM, monitor the DC volt level at junction of R131 and C67, Adjust RV6 so that
DVM reads 0.7VDC.
7.
Remove RF signal from receiver.
8.
Insert JMP20 in positions 1-2.
9.
Toggle RF signal ‘on’ and ‘off’ to ensure key tone represent mute status.
10.
With the key tone present, adjust RV1 to obtain the required Variable Tone level (-20dBm is
the default level).
11.
Type "RMENU
↵
" to access inbuilt software menu.
12.
Select Calibration Menu. (R)
13.
Select Variable Tone Calibration points (N)
14.
Follow on screen instructions.
15.
Exit menu system and cycle power to radio.
16.
Insure front panel signal Leds (RSSI Leds) and Key tone changes at the correct RF level
points, see table above.
Note
(Note# Sixth led will not light due to only 5 RF level points are used in this setup)
15
© SPECTRA ENGINEERING 2010 Revision 1.0.4