ELAD QSF-06
User Manual Rev 1.0 04/2016
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4
1
Overview
ELAD QSF-06 is a switchable preselector that allows the selection between 6 configurable filters. User
can configure the internal board by choosing the right set of filters within the filter module family
provided by ELAD or self-build. The QSF-06 board has also an on board active switch which ensure fast
commutation time between transmission and reception state and a band select output to drive an
external amplifier. Using the ELAD FDM-SW2 SDR software it is possible to configure the FDM-DUO to
automatically select the proper filter as a function of the tuning frequency.
The block diagram here below represents the QSF-06 board.
PTT IN
LED
TX
ANT
RX
Preselector
Filters
1.7MHz High
Pass Filter
DAC
BAND OUT
EXT IO
I2C
control lines
SPI
control lines
PTT control line
RX PATH
TX
PATH
