June 2003 IPN: M5000-00-105 Circuit descriptions B - 15
+4V3-DEC
The +4V3-DEC supply is derived from the
+5V-AN voltage. It is used to power the trans-
mit and receive VCOs in conjunction with the
transmit control line from the processor. It
also provides the loop filter reference in the
synthesiser.
Accessory connector interface
The accessory connector interface is described
in Part F: Accessories.
Universal band versus wideband IF
filtering
The IF filtering for the universal band is
designed in such a way that it functionally
meets specifications for both narrowband and
wideband systems.
The Deviation and Receive Audio Processing
are selectable per channel, which enables the
radio to inter-operate between narrowband
and wideband channels.
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