Installation - Pyramid SVR-200 LA Service Manual

Before installing the SVR-200, ensure that the RF and repeater sections are properly aligned per the tuning
instructions on pages 8-14 of this manual. Additionally, ensure that the SVR-200 jumpers are properly configured
for use with the particular mobile radio that it will be connected to:
J1 Controls the maximum drive level of the transmit audio output to the mobile radio. If J1 is installed, output amp
U1B will have an adjustment range of 0-100 mVPP. If J1 is removed, U1B can be adjusted between 0-5VPP.
J2 Controls the output impedance of the transmit audio line to the mobile radio. If connected to a low impedance
point in the mobile, installing JP2 sets the output impedance to 600 ohms. If JP2 is open, the output impedance
is 2.2Kohms. Install the jumper for radios that require a lot of modulation drive or that have low impedance
microphone circuits. Remove the jumper if the SVR-200 installation decreases local microphone audio at the
mobile.
J3 Used for testing the SVR-200 receiver and setting the lock tone deviation transmit level. If JP3 is shorted at
power up, the SVR-200 receiver will be active all of the time and receiver audio will be heard at the speaker
regardless of the repeater squelch setting or CTCSS tone decoded. Remove the jumper and turn the SVR-200
off to return to normal operation. If JP3 is shorted while power is applied, the SVR-200 will go into transmit
mode and send lock tone for as long as the jumper is shorted. Remove the jumper to return to normal operation.
J4 Used to internally tie the local mic input of the SVR-200 to the transmit audio output line which is usually
connected to the mic hi line in the mobile.
J5 Used to internally tie the on-air detect input of the SVR-200 to the PTT output. Do so only on conventional
radios; trunking radios must have the on-air detect line connected to a line indicating that the radio is
transmitting.
J6 Changes the maximum gain of the local mic input amp from unity (Out) to 10x (In).
J7 Changes the maximum gain of the receive audio line input from unity (Out) to 7x (In).
J8 Adds a pull up (+ position) or pull down (- position) resistor to the remote enable line (blue).
J9 Adds a pull up resistor (10K to 5VDC) to mobile COR line (violet)
Make the connections between the mobile radio and the SVR-200 cable as follows:
Pin 1: Ground. Connect to the radio's chassis or ground plane.
Black/Shield
Pin 2: Mobile transmit audio. Connect to the mobile transmit audio path or tone input. If connected before
White
pre-emphasis, ensure that the SVR-200 is programmed for de-emphasis (common data). If connected
after pre-emphasis, ensure that the SVR-200 transmit audio path is programmed as flat. Pin 2 is AC
coupled and has an output impedance of 600 or 2.2Kohms (determined by J2). RV3 sets the transmit
audio output level and J1 sets the adjustment range between 0-5VPP (J1 open) or 0-100mVPP (J1
shorted).
Page 6
SVR-200 Service Manual

Installation