3
HARDWARE INSTALLATION
Be certain to follow standard anti-static procedures when handling any of Midian’s products.
P1-4 – Black
– Ground – Connect to the nearest ground point.
P1-2 – Red
- +5.5 – 15 VDC – Connect to switched B+ in the radio.
P1-3 – Brown
– Test Mode – Connecting this wire to B+ and pressing PTT puts the TRE-2 into a test mode. This
extends all of the tones to about 8 seconds each to facilitate setting the output level using pot R30.
P1-1 – Green
– TX Tone Out – Connect to modulator circuit. Use high impedance point in radio. Low-Z will cause
low frequency roll-off across C10 output coupling cap and R31. In Low-Z mic circuits, it may be necessary to short
R31 and increase C10.
P1-5 – Blue
– Alert Tone/Speaker Audio – Connect to high side of the speaker with the other side of the speaker
at ground. This allows the monitoring of the tones if desired. When using 20-40 Ohm speakers, the onboard
resistor in series with Q3 should be sufficient. When attaching this lead to a 4-8 Ohm speaker, add a 100-Ohm
resistor in series with the lead to limit current.
P1-11 – Gray
– PTT In – Requires a logic low from the radio’s PTT switch. Sends either the Tone 1 (default = F1
1950 Hz) or Tone 2 (default = F2 1850 Hz) keying tone based on logic level at F1/F2 input.
P1-12 – Orange/White
–Monitor – Grounding this lead transmits the monitor function tone.
P1-13 – Violet
– F1/F2 Select – High or open selects Tone 1. Grounding this wire selects Tone 2.
HARDWARE ALIGNMENT
To set the alignments, connect the brown wire to B+ and the gray wire to ground. This puts the unit into Test
Mode which lengthens the tones to approximately 8 seconds each for alignment purposes.
Installation into a Balanced Audio Device:
Adjust R30 for the high-level 2175 Hz guard tone at a relative level of +10 dB, followed by the selected function
tone at a relative level of 0 dB, followed by low-level guard tone at –20 dB relative level.
Installation into a Two-Way Radio:
Set the modulation pot R30 to the transmitter’s maximum deviation using the high-level guard tone.
Содержание TRE-2
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