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 – COR/COS – Not used.
P1-6 – Orange – RX Tone Input – Connect to an audio point in the receiver, usually the high side of the volume
control or discriminator output. When using CTCSS, pick up the audio after the high pass filter.
P1-7 – Yellow – Monitor/Squelch Output – Connect to a point in the squelch circuit that normally changes logic
level with carrier. The squelch polarity is set in the KL-3 software and by selecting the polarity of D-5 by inserting
either JU5 or JU6. R-47 can be changed to provide more or less current as needed. Do not allow the
Monitor/Squelch Output to conflict with the COR/COS lead input.
P1-10 – Gray/White – Horn Output - This provides a 1-9 second/minute open-collector output to ground during
ringing through Q8.
Disable – This feature is the Deadbeat Disable function. When activated Q7 latches low until commanded to
unlatch. To access this feature, JU8 must be removed and JU7 installed.
P1-1 – Green – TX Tone Out – Connect to the modulator circuit. Use high impedance point in the radio. If
generating CTCSS, use the CTCSS point in the modulator. Only needed if using the transpond tone.
P1-8 – Green/White – Mic Mute – Not typically used on this product.
P1-5 – Blue – Alert Tone/Speaker Audio – Connect to high side of the speaker. This provides Time-Out Timer,
Penalty, and Go Ahead tones. 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 – Not typically used on this product.
P1-9 – White – PTT Out – Connect to the PTT Switch of the radio. The PTT transistor, Q6, is rated at 100 mA
continuous. This is only needed if using the transpond tone.
P1-12 – Orange/White – Monitor/Program In – For Program In, this lead is connected to the Green lead from the
KL-3 programmer. For Monitor, this input can be used to reset the Monitor/Squelch Output.
P1-13 – Violet – Auxiliary/Emergency Input – Not used on this product.
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