Operations Manual

RF Technology R50 Page 11
5 CIRCUIT DESCRIPTION
5.1 R50 Master Schematic (Sheet 1)
Field2: Transmit Frequency(in MHz) if the exciter is keyed up by anything but
PTT-in being asserted. This is 35.0 MHz in the example.
Field3: CTCSS Tone(in Hz) if PTT-in is asserted. This is 100Hz in the example.
Field4: CTCSS Tone(in Hz) if the exciter is keyed up by anything but PTT-in
being asserted. This is 120Hz in the example.
Fields 5,6,7: These define the start-up delay (in hundredths of a second), the transmit
tail (in seconds), and the no tone period (in tenths of a second) if the exciter keys up
from PTT-in being asserted.
Fields 8,9,10: These define the start-up delay (in hundredths of a second), the transmit
tail (in seconds), and the no tone period (in tenths of a second), if the exciter keys up
from anything other than PTT-in being asserted.
Field 11: Selects the line parameter if PTT-in being asserted caused the exciter to key
up. In the example it has disabled the 20dB gain pad, and enabled pre-emphasis on
Line 2 (Line 1 is disabled).
Field 12: Selects the line parameter if anything other than PTT-in being asserted
caused the exciter to key up. In the example it has disabled the 20dB gain pad, and it
would enable pre-emphasis on Line 1 and Line2 (i.e. audio on each input is mixed).
Field 13: Selects the Tone deviation and the Maximum Line deviation if the exciter
keys up from PTT-in being asserted In the example, it has selected the default
maximum line deviation (5kHz), and the default tone deviation of 750Hz. (See Tables
7 and 8)
Field 14: Selects the Tone deviation and the Maximum Line deviation if the exciter
keys up from anything other than PTT-in being asserted In the example, it has
selected a maximum deviation of 2.5kHz, and a maximum tone deviation of 375Hz.
(See Tables 7 and 8)
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 7 sheets in the schematic in all.
5.1 R50 Master Schematic (Sheet 1)
Sheet 1, referred to as the "R50 Master Schematic", is a top level sheet, showing four
circuit blocks, and their interconnection with each other, as well as the interconnection
with all connectors and external switches.
P1 is the front panel DB9 RS-232 connector for attachment to a terminal, a terminal
emulator, or to an IBM PC running the Eclipse50 software.