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8M083X25 R14
APX Series P25 Interface
DVRS Installation & Programming Guide
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PART I
January 2019
Page 28 of 153
Figure 7 Vehicular Mount In-Band 700 or 800MHz DVRS Model - Full Duplex & Simplex
Capable
Figure 8 Vehicular Mount In-Band VHF or UHF DVRS Model - Full Duplex & Simplex Capable
More complex RF Bypass Switch algorithm is needed for APX8500 radios which have
single antenna port for multiple bands, and the optional external antenna triplexer is not
installed. New algorithm would assure that MSU In-band filter is in use only when MSU is
operating on the zone/channel that is in the same band as DVR. Therefore, the following
change of DVR algorithm was made for DVR:
-
MSU In-Band Filter to be in use when DVR is enabled AND mobile is on an In-
Band channel
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In all other cases (MSU is on Cross-Band channel or on Multiband channel that
is not affecting/crossing into DVR band) MSU In-Band filter should be bypassed