MX800 Transceiver Technical Manual
© SPECTRA ENGINEERING 2006 Revision 4.2.3
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3.17.4.6 Software Setup
The T19 / T26 option board has a software menu system which is used to
configure, calibrate and test the board. The menu system is entered through a
terminal emulator program.
The settings are 9600-baud, no parity, 8 data bits and 1 stop bit.
HyperTerminal, which is included with Windows, is a suitable program for
this purpose.
The command ‘RMENU↵’ is entered on the terminal, this command is not
case sensitive. The user will then be presented with a menu system from
which various settings and configurations can be selected. To exit the menu
system the <ESC> key can be pressed.
3.17.5 Variable Tone Setup Procedure
This section provides a set by step approach to enable the option board for
uses as a Variable Tone encoder T26
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.
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 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. Adjust RV1 to obtain Variable Tone level (-20dBm is the default level).
10. Type "RMENU↵" to access inbuilt software menu.
11. Select Calibration Menu. (R)
12. Select Variable Tone Calibration points (N)
13. Follow on screen instructions.
14. Exit menu system and cycle power to radio.
15. Insure front panel signal Leds (RSSI Leds) and Key tone changes at the
correct RF level points, see table above. (Note# Sixth led will not light
due to only 5 RF level points are used in this setup)
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