ft635ule_eng (21.06.2012)
- 4 -
- 5 -
ft635ule _eng(21.06.2012)
Kompetent für Elektroniksysteme
Kompetent für Elektroniksysteme
Carrier detection
The FT635UELE offers different possibilities of carrier detection. The carrier input can
be low or high active and a pull-up resistance can be activated additionally. Alternative
possibilities are the AF controlled carrier and the phantom control. For phantom control
the solder jumper JP2 has to be resoldered. The carrier is active if one or both pins of the
AF input of the radio are connected to ground.
Reg. Function
056 1. digit
0 = carrier input low active, pull-up on
1 = carrier input high active, pull-up off
2 = AF controlled carrier
3 = phantom carrier
4 = carrier input low active, pull-up off
5 = carrier input high active, pull-up on
If the normal carrier input is also to be used as external input additionally or exclusively for
other functions, 2 or 3 needs to be programmed at the first digit in register 056.
Reg. Function
056 2. digit: configuration of the carrier input without
carrier function
(if the 1. digit is programmed with 2 or 3)
possible values: 0,1,4,5 same as 1.digit
The FT635 Interface can activate the transmitter in 3 different ways. The PTT relay has
a potential-free output for the PTT activation. One pin has to be connected externally to
the reference voltage which is needed by the two-way radio (normally GND or +Batt) and
the other pin is connected to the PTT input of the two-way radio. Alternatively there is the
possibility of PTT phantom control. With phantom control the PTT is acitvated by switching
the center tap of the output transformer to GND. To activate the phantom control the
solder jumper JP1 needs to be resoldered. For reasons of compatibility to FT633UELE
the PTT by a switching output is possible. For FT633UELE I/O15 is used as PTT output.
Ex factory I/O15 is configurated as input for FT635UELE and needs to be reprogrammed
(see section "In- and outputs").
Transmitter control