F-9810 Pre-Selector/Post-Selector

The Sunair F-9810 Pre-selector/Post-selector permits operating collocated Sunair 9000E Series radios, whether transceivers, transmitters, or receivers, on frequencies
with as small as a 10% separation.

The Sunair F-9810 is controlled by the 9000E Series radio it serves.
When used with the various models of the R-9000E Software-Defined HF/ISB receiver, the F-9810 functions as a pre-selector and provides an additional front end
selectivity stage, thus reducing the receiver desensitization and overload that normally occurs in the presence of strong adjacent RF transmissions.
When used with the T-9000E Software-Defined HF/ISB Transmitter, the F-9810 functions as a post-selector, rejecting spurious outputs and broadband noise in the transmit signal
before it reaches the Sunair LPA power amplifiers, thereby limiting interference to collocated receivers.
A separate transmit antenna port provides the flexibility of using either a single antenna or separate transmit and receive antennas.

In addition, the keyline over coax feature prevents damage to the unit from high power RF transmission by reducing the control time delay of transmitto-receive switching.
The F-9810 offers a selectivity of 35 dB minimum (±10%), 40 dB typical, from the nominal tune frequency, with an ultimate rejection of 70 dB minimum.

The unit tunes in 10 Hz increments, and tuning time is 10 ms maximum, making the F-9810 suitable for ALE applications. Furthermore, the F-9810 offers two levels of gain.
The Pre-Selector/Post-Selector’s intuitive modular design allows for ease of maintenance and upgrade throughout the equipment life cycle at minimal expense.