User's Manual

Pin 7: Mobile COR detect. This line is used to indicate when the SVR-P250 should repeat the transmission
to the handheld. Connect to a logic point in the radio that indicates proper tone and carrier have
been detected or the audio unmute line. If this line goes more posi ve during an unmute condi on,
program the mobile COR line as ac ve high (common data). If the line goes more nega ve during
an unmute condi on, program the mobile COR line as ac ve low. The input from pin 7 is high
impedance and does not have to go rail to rail. The SVR-P250 uses a voltage comparator as a COR
threshold detector and is factory set at 1.6VDC. The COR input must go at least 0.5VDC on either
side of this threshold.
Pin 8: Local mic audio. If programmed for local mic repeat, the SVR-P250 will go into transmit mode and
repeat the audio from this line whenever the mobile radio is keyed by the local mic. Connect this
line to the mobile transmi er audio path before limi ng or fi ltering. This input is AC coupled and
high impedance (>5.6Kohms). The input level at this pin should be 300mV to 5VPP. RV2 sets the
local mic sensi vity. If the mic high line has suffi cient drive for this input, install J4 and leave pin 8
unconnected. J6 sets the gain of the local mic input amp. If open, the maximum gain is one; if
installed, the maximum gain is 10.