Circuit Description; T50 Master Schematic (Sheet 1); Line Input Processing Section (Sheet 4) - RF Technology Eclipse Series Operation And Maintenance Manual

4 CHANNEL PROGRAMMING AND OPTION SELECTION
Most Significant BCD digit of Fields 13 or 14
Table 8: Maximum Tone Deviations (when Max Dev is 5kHz)
Note that the actual maximum tone deviations depend on the maximum deviations. If a
maximum deviation of 4kHz was chosen, and a nominal tone deviation of 250 Hz, the
actual maximum tone deviation would be 250*4.0/5.0 = 200Hz.
If the Eclipse50 Software is not used to program the exciter, it is recommended that the
programming information is prepared using a spreadsheet and/or a text editor, and the
resulting file is then downloaded, as a text file, to the firmware using, for example,
HyperTerm.
Note that if using HyperTerm to download the text file, at 57600 bits per second or
higher speeds, the connection properties may need to be changed to add a 10
millisecond delay after each line of text is sent.
5

Circuit Description

The following descriptions should be read as an aid to understanding the block and
schematic diagrams given in the appendix of this manual.
There are 9 sheets in the schematic in all.
5.1

T50 Master Schematic (Sheet 1)

Sheet 1, referred to as the "T50 Master Schematic", is a top level sheet, showing five
circuit blocks, and their interconnection with each other, as well as the interconnection
with all connectors and external switches.
JP12 is the connector, on the printed circuit board, for the microphone input.
P3 represents the rear female DB25 connector.
J1 is the nominal 1W RF output (BNC) connector, which is used to connect to the
External Power Amplifier.
J4 is an optional BNC connector for an external reference clock. If an external
reference clock, with power level from +5 to +26dBm is attached here, the firmware
will automatically track the channel VCO to the reference.
RF Technology T50
0
1
2
3
4
5
Nominal Tone Deviation
750Hz
500Hz
375Hz
250Hz
150Hz
User Specified (default: 600Hz)
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