Midian VS-1000, Manual

Page: 5 / 20

HARDWARE INSTALLATION
Be certain to follow standard anti-static procedures when handling any of Midian’s products. For installation
instructions into a particular radio, please consult Midian’s application notes for the VS-1XXX, if available.
Before installing the scrambler, follow the alignment procedures starting on page 6.
For all diode protected inputs (i.e. PTT Input, Mode Input, COR Input) the voltage level to be required for a logic
low is less than 0.5 V and a logic high requires at least 2.1 V.
P1 – Connector Side
P1-1 – Green – PTT Input – Connect the PTT Input lead to the high side of the PTT switch.
P1-2 – Red – VIN +4.75-15.5 VDC – Connect to switched battery point in the radio. Connect to a regulated
voltage point in a vehicular radio if engine noise is present on the battery line. Keep this lead as short as possible.
The VS-1000 and VS-1050 support 4.75 to 15.5 VDC. The VS-1200 supports 4.75 to 10 VDC. If a higher voltage
input is needed on the VS-1200 a 4.7 Volt Zener diode must be installed in series with the voltage input lead.
P1-3 – Brown –Mode Select & VS-1200 Code Select – Connect to a momentary or latching switch. If a latching
switch then code select is not available.
P1-4 – Black – Ground – Connect to the nearest ground plane in the radio.
P1-5 – Blue – TX Audio In – The VS-1XXX must be installed in the TX audio path between the microphone and
the insertion point of CTCSS or other tone signaling. Break the TX audio path and connect to the side nearest the
microphone.
P1-6 – Orange – Emergency Input – Future Use.
P1-7 – Yellow – RX Audio In – The VS-1XXX must be installed in the receive audio path after the CTCSS high
pass filter and where any tone signaling is picked off. This point needs to be given a constant level. If possible
connect to the high-side of the volume control where a constant level is available. Connect to the source of the
audio at the break.
P1-8 – Green/White – Audio Enable Out - This output is active during whenever the VS-1XXX beeps such as when
indicating mode. Connect this lead to a point in the radio, which will turn on the radio’s speaker power amp, allowing beep
tones to be heard.
P1-9 – White – PTT Out – Future Use.
P1-10 – Gray/White – RX Audio Out – Connect to the side closest to the receiver's speaker driver amplifier at the
above mentioned break point (see P1-7). In addition to outputting receive audio, this lead outputs beep tones
whenever applicable, such as when the mode switch is pressed.
P1-11 – Gray - Mode Out – If desired, connect to the cathode of an LED with a 1 K limiting resistor in series
connected to a voltage source up to 15 V. Failure to include a current limiting resistor in series with the LED will
cause damage. This output is used to provide a visual indication of scramble or clear mode. Another application
of this output is to provide a logic level (high or low (0-3.3 V)) to indicate mode to the radio’s mode indication icon
(if applicable).
P1-12 – Orange/White – TX Audio Out – Connect to the point nearest the modulator at the above-mentioned
breakpoint (see P1-5).
P1-13 – Violet – COR Input – Connect to a point in the radio receiver squelch circuit that changes state when carrier is
present.
5