6
Radio Interface:
CON6 and CON2 are located in the middle of the back panel and are used to connect the PTA-16 to the base
station radio or repeater. For Mini-TRC Mode only the power, ground, TX Output, RX Output and COR
connections are needed. The other connections are for the tone remote adaptor mode. The following are the
connection points:
CON6:
CON6-2 (Orange): COR: Tone Remote Adaptor Mode: Connect this lead to the busy detect of the radio. This
input is used to control whether audio should be passed down the line to the tone remote controllers. Generally
this line is not used, but if the base station has any low-level noise or hum this line will mute the noise until the
radio opens squelch and passes full audio. A logic low from the radio’s busy circuit will activate Q8. Mini-TRC
Mode: In the Mini-TRC Mode this input acts as a PTT input. This input when taken to ground causes the PTA-16
to generate the keying tones and allows voice audio to pass through the unit.
CON6-5 (Green): TX Output: Tone Remote Adaptor Mode: Connect to the microphone input of the base
station/repeater. Mini-TRC Mode: In the Mini-TRC Mode this is the RX audio from the tone remote adaptor.
Connect to the speaker audio input.
CON6-6 (Red): Battery (13-18 VDC): Connect this lead to 13-18 VDC from the base station/repeater.
CON6-7 (Black): Ground: Connect this lead to the base station’s or repeater’s ground.
CON6-8 (White): RX Input: Tone Remote Adaptor Mode: Connect the receive audio in the base station after
the sub-audible hi-pass filter and at some point that gives flat audio to the PTA-16. Speaker audio is fine if it is
single ended, but make certain the volume control cannot be turned down accidentally. Mini-TRC Mode: In the
Mini-TRC Mode this is the mic audio input. This input does not have a bias supply for a mic element. The audio
presented here should be from a dynamic mic or a carbon equivalent or electrets with its own amplifier/power
source.
CON6-9 (Blue): PTT Output: Connect this lead to the PTT on the radio. With JP1 installed in the 2-3 position, the
output is an open-collector to ground. With JP1 installed in the 1-2 position, the optional PTT relay is active low
upon contact closure with JP4 installed in the 2-3 position.
CON2:
CON2-3 (Violet): Binary Select 1: This output is an open-drain FET than can pull the radio’s channel select line
to ground. This line can be used with CON2-4, CON2-5 and CON2-6 for multi-line (2, 3 or 4 line) binary channel
selection.
CON2-4 (Yellow): Binary Select 2: This output is an open-drain FET than can pull the radio’s channel select line
to ground. This line can be used with CON2-3, CON2-5 and CON2-6 for multi-line (2, 3 or 4 line) binary channel
selection.
CON2-5 (Green): Binary Select 3: This output is an open-drain FET than can pull the radio’s channel select line
to ground. This line can be used with CON2-3, CON2-4 and CON2-6 for multi-line (2, 3 or 4 line) binary channel
selection.
CON2-6 (Red): Binary Select 4: This output is an open-drain FET than can pull the radio’s channel select line to
ground. This line can be used with CON2-3, CON2-4 and CON2-5 for multi-line (2, 3 or 4 line) binary channel
selection.
