2 INSTALLATION RT2047 DSC - PART I
PAGE 2-10
2.8 ANTENNAS
All common 50 ohm antennas, which cover the used frequency range with a reasonable standing wave
ratio, maximum 1.5, are applicable.
The antenna is connected to the set by means of a 50 ohm coaxial cable with low loss, e.g. RG213U. At
the cable end a PL259 plug is mounted.
The antenna must be placed as high and as free of obstructions as possible. The horizontal distance to
metal parts must be at least 1.0 metre.
S. P. Radio has an antenna with the necessary specifications available for purchase. The mentioned
antenna is characterised by small external dimensions. See the special brochure ‘VHF AERIALS’ for
particulars.
2.9 SPECIAL OPTIONS
K-SWITCH.
It is possible to change between standard functions and the German river boat functions by installing an
external switch.
SELCALL RELAY.
When the selcall has accepted a CQ or individual call signal, the selcall relay, RE1-9 on the Filter-unit will
turn on and short-circuit two wires, which can be used for remote alarm. Max. contact load: 100V AC/24V
DC - 2A. This option is available on the filter print.
AF TO INFORM. DECODER.
The circuit giving AF signals to the information decoder is turned on when the set has accepted a CQ or
individual call signal. The circuit is turned “ON” or “OFF” like the relay RE1-9. This option can be found
in connector P4-6 on the interface print.
AUX II.
When an information on certain channels is wanted, i.e. controlling a watch keeping receiver, the AUX
II information can be used. A relay RE2-9 on the Filter-unit is controlled through the buffer/inverted U11/
5-6 from the ìC U19-6. Max. contact load: 100V AC / 24V DC - 2A. The AUX II option is available on the
filter print.
OUTPUT TO RECORDER.
Through the connector P4-6 pin 1 and 2 on the INTERFACE UNIT (6) the AF signal to the telephone output
can be led to a tape recorder. This option is located in connector P4-6.
AUX 1
The option AUX I is for-either internal or external use. It is placed in P3-6 pin 1 on the INTERFACE UNIT.
Max. level on the output of the U11-6 must not be more than the battery level, because a diode is
connected to the supply pin in the IC.
DISTRESS CRY / INTERRUPT
Jumper P8-6 on the interface print leads either ‘Distress Cry’ or ‘Interrupt’ through the filter print to the
handset key connector. The Interrupt signal is required when RT2047 is used with the VHF DSC RM2042
and Distress Cry is used for scramblers CRY2001 and CRY2002.
PHONE PATCH / +13V
Jumper P34-9 is used for selecting if The ‘Phone Patch’ signal or if ‘+13V’ should be led to the handset
key connector. +13V is required when RT2047 is used with the VHF DSC RM2042 and Phone Patch is
used for the Phone Patch unit H2047.