Switchable Preselector Filter Board for FDM SDRs
ELAD SPF-08 is switchable pre-selector board that allows selection between 8 configurable filters. Users can configure the board by choosing the right set of filter within the filter module family provided by ELAD. Moreover, ELAD FDM-SW2 SDR software can be configured to automatically select the proper filter as a function of the tuning frequency.
ELAD SPF-08 Package Contents ELAD SPF-08 package contains:
SPF-08 switchable pre-selector board
FBPY bypass module already installed in slot No. 8 (see section 4.3)
DB9 male/male flat cable
SMA male/male cable
Rubber feet
User manual.
1 – RF IN SMA female 50Ω RF Input connector. 2 – RF OUT SMA female 50Ω RF Output connector.
Using SPF-08 with ELAD FDM-DUO SDR Transceiver When SPF-08 board is connected with an ELAD FDM-DUO SDR Transceiver, the configuration is stored in the FDM-DUO internal memory. At the startup, FDM-DUO senses the DB9 connector and if the SPF-08 board is found the transceiver automatically applies the stored configuration according to the tuning frequency. To save the desired configuration in the FDM-DUO memory, use the “FDM-DUO Manager” feature in the ELAD FMD-SW2 SDR Software. In the “SPF-08 Perselectros” panel set “YES” in the “Enable Presel SPF-08 Table” to enable the use of preselector board. The settings table is formed by 8 rows, one for each filter slot of the SPF-08 board. Each row comprises 4 fields:
ID: slot number from 1 to 8
Enabled: set “YES” to enable the selected filter
High Pass Freq: high pass frequency of the selected filter
Low Pass Freq: low pass frequency of the selected filter.
Press “Save” button to store the table in the FDM-DUO internal memory. In the following figure is reported the configuration of a SPF-08 board with:
FBP40-1 filter module (Band Pass filter for 40 m band) mounted in slot number 3;
FHP05M-1 filter module (500 kHz High Pass filter) mounted in slot number 7;
FBPY module (bypass) mounted in slot number 8.
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