MX800 Transceiver
Technical Manual
1.4.5.3
Variable & Stepped Tone Encoder -TX Alignments
1.
PTT the transmitter.
2.
Set the transmitter modulation frequency to 1 kHz, -10dBm level injected in through
the rear RJ45 connector, pin3 & 4. (Balanced audio)
3.
Disable Notch Filter JMP9 (Position 1-2)
4.
Disable AGC on Option Board JMP13 (Position 2-3)
5.
Adjust TX input line gain RV5 to obtain 1 Vp-p at IC13 pin 1.
6.
Monitor TX modulation depth and insure it is equal to the nominal deviation level. If
not adjust RV4 on the motherboard to obtain correct level.
1.5 Status Tone Encoding & Decoding (T19 only)
This powerful option board allow the user to be able to monitor the status of the MX800. The
option works by superimposing fixed audio tones per status to line. This provides the current
status on mute open or closed. This signalling is then sent down a 2 or 4 wire line system. The
decoder then processes the status tones and applies the various functions as need. I.e.
Programmable PTT tones, PTT ON & PTT OFF.
RX mute status tone encoder provides a signalling tone either when mute is open or when mute is
closed depending upon system requirement. The signalling tone is notched out from the speech
or noise components on the receiver frequency, to prevent false system decodes.
1.5.1 Status Tone Encoder & Decoder Setup Procedure
This section provides a step by step approach to enable the option board for uses as a Status Tone
Encoder and Decoder.
1.5.1.1
Status Tone Encoder & Decoder- 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.
7.
Repeat steps 2 & 3
8.
Select Decoder Menu (D)
9.
Select (1) and enter the PTT decode tone.
10.
Also enable AGC (2) And Bandpass filter (3)
11.
Programming is complete.
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© SPECTRA ENGINEERING 2010 Revision 1.0.4