Sunair F-9810B Pre/Postselector

F-9810B PRE-SELECTOR/POST-SELECTOR

The Sunair F-9810B Pre-selector/Post-selector permits operating collocated Sunair 8400 Series radios, whether transceivers, transmitters, or receivers, on frequencies
with as small as a 10% separation.

The Sunair F-9810B HF Pre-selector/Post-selector is a professional , high performance HF multicoupler.

The Sunair F-9810B HF Pre-selector/Post-selector is controlled by the 8400 Series radio it serves.
When used with the various models of the Sunair R-8400 HF Receiver, Wideband, Sunair RT-8500WB HF Transceiver, Wideband, T-10000 HP 10kW HF Transmitter, Wideband, Sunair 8220WB 1 kW HF Transmitter, Wideband, Sunair 8220WB 1 kW Transceiver, Wideband, Sunair 5 kW HF Transmitter, Wideband.

The Sunair F-9810B HF Pre-selector/Post-selector 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-8400 Software-Defined HF/ISB Transmitter, the Sunair F-9810B Pre-selector/Post-selector 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 Sunair F-9810B HF Pre-selector/Post-selector 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 Sunair F-9810B Pre-selector/Post-selector suitable for ALE applications. Furthermore, the Sunair F-9810B Pre-selector/Post-selector offers two levels of gain.
The Sunair F-9810B Pre-selector/Post-selector’s intuitive modular design allows for ease of maintenance and upgrade throughout the equipment life cycle at minimal expense.

Sunair F-9810B Pre/Postselector
  • Improves Cosite Performance
  • Attenuation 40 dB Typical / 70 dB Maximum
  • Selectable Gain
  • Individual Transmit and Receive Antenna Ports
  • Automatic Tracking 10 ms Tuning
  • Automatic RF Overload Protection
  • Automatic Bypass

CERTIFICATIONS AND STANDARDS

  • MIL-STD 810F, Method 516.5, Procedure 1
  • MIL-STD 810F, Method 514.5 & MIL-STD-167-1

HF pre/postselector

HF pre/postselectors are specialized filtering units used in high-frequency (1.5–30 MHz) communication systems to improve signal quality and prevent interference, particularly in environments where multiple radios are operating in close proximity (cosite locations).

Core Functions
  • Preselector (Receive Mode): Functions as a highly selective band-pass filter between the antenna and receiver. It blocks strong out-of-band signals that would otherwise cause receiver desensitization, cross-modulation, or intermodulation distortion.
  • Postselector (Transmit Mode): Acts as a filter between the transmitter and antenna to suppress spurious emissions, harmonics, and broadband noise. This prevents the transmitter from interfering with nearby receivers on adjacent frequencies. 
Key Features and Specifications (2026)
  • Rapid Tuning: Modern digital units, such as the Sunair F-9810, feature automatic tracking with tuning times as fast as 10 ms, making them fully compatible with high-speed Automatic Link Establishment (ALE) protocols.
  • Cosite Performance: Designed to allow radios to operate with as little as 10% frequency separation without mutual interference, critical for shipborne and vehicle-mounted applications where antenna space is limited.
  • Ruggedized Design: Units like: Sunair F-9810, Sunair F-9810B, L3Harris RF-5845H are built to military specifications (e.g., MIL-STD-810) for shock, vibration, and extreme temperatures (-30°C to +65°C).
  • Selectable Gain: Many units include built-in low-noise amplifiers (LNA) to provide switchable gain for weak signals.
Notable Models
  • Sunair F-9810: A software-defined unit providing 40 dB typical attenuation and automatic RF overload protection, used in high-power strategic HF systems (1kW, 5kW, 10kW, HF receiver).
  • Sunair F-9810B: A software-defined unit providing 40 dB typical attenuation and automatic RF overload protection.
  • L3Harris RF-5845H-PP101: A digitally tuned, high-performance pre/postselector for tactical Falcon II/III radio systems.
  • Rohde & Schwarz HF Postselectors: Digitally tuned filters using RF relays, specifically optimized for suppressing harmonics in shipborne deployments.
  • Datron PPS7700: Part of the Spectre H series, used in high-power strategic HF systems. 

HF Transmitters & Receivers

We deliver long-range surveillance platforms utilising the latest MF/HF transmitters (500 W, 1 kW, 5 kW, 10kW), which have been designed to meet the harsh and challenging environments associated with the defence and civil sectors.

Explore the latest in HF transmitters and HF receivers designed for demanding environments in both defense and civil sectors.

Having first begun in 1956 as a manufacturer of  HF radios (MF/HF radios, 5 kw MF/HF transmitter, 10 kw MF/HF transmitter, 1 kw MF/HF transmitter, 500 w MF/HF transmitter, 5 kw MF/HF transceiver, 10 kw MF/HF transceiver, 1 kw MF/HF transceiver, 500 kw MF/HF transceiver, HF receiver, MF/HF receiver,  5 kw HF transmitter, 10 kw HF transmitter, 1 kw HF transmitter, 500 kw HF transmitter, 5 kw HF transceiver, 10 kw HF transceiver, 1 kw HF transceiver, 500 kw HF transceiver).

Sunair has a history of leadership in the arena of secure radio communications for military, government, civil aviation, and commercial applications worldwide.

Our 8000 Series HF Radios, Linear Power Amplifiers, High Power Transmitters: T-10000 HP 10kW HF Transmitter Wideband, 8220WB 1 kW HF Transmitter Wideband,  RCU-8310 Remote Control Unit,  R-8400 HF Receiver Wideband,  F-9810B Pre-Selector/Post-Selector,  Sunair ARGUS 9000E MCC software fot remotely and simultaneously monitor, configure, and control up to eighteen (18) Sunair 8000 Series radios, Antenna Switching Matrix and Antenna Couplers are the next generation of products supporting mission-critical operations, and are designed for all strategic environments, including C3 (command, control, and communications), fixed station, shelterized, transportable, vehicular, and shipboard. When coupled with our complementary accessories, our equipment covers all contemporary requirements – from basic voice communications to data, email, fax, chat, high speed ALE, encryption, security, and interoperability.

APPLICATIONS FOR MILITARY SOLUTIONS

Sunair HF products and solutions are used and implemented around the world, in applications requiring the failsafe exchange of information. Militaries, governments, civil aviation agencies, and commercial organizations need to exchange information swiftly and securely, often across hemispheres. Sunair supplies interoperable and powerful high-frequency communications systems to permit those security organizations to respond promptly in absolute mission-critical situations. Sunair HF equipment is ruggedized and built to comply with the highest military standards at the national and international level, to ensure both global interoperability and versatility for air, surface, and maritime applications in a host of configurations, including C3, fixed station, shelterized, transportable, vehicular, and shipboard.

Having first begun in 1956 as a manufacturer of airborne HF radios (MF/HF radios, 5 kw MF/HF transmitter, 10 kw MF/HF transmitter, 1 kw MF/HF transmitter, 500 kw MF/HF transmitter, 5 kw MF/HF transceiver, 10 kw MF/HF transceiver, 1 kw MF/HF transceiver, 500 kw MF/HF transceiver, HF receiver, MF/HF receiver,  5 kw HF transmitter, 10 kw HF transmitter, 1 kw HF transmitter, 500 kw HF transmitter, 5 kw HF transceiver, 10 kw HF transceiver, 1 kw HF transceiver, 500 kw HF transceiver).

AIR

Having first begun in 1956 as a manufacturer of airborne HF products (HF radios, MF/HF radios, 5 kw MF/HF transmitter, 10 kw MF/HF transmitter, 1 kw MF/HF transmitter, 500 kw MF/HF transmitter, 5 kw MF/HF transceiver, 10 kw MF/HF transceiver, 1 kw MF/HF transceiver, 500 kw MF/HF transceiver, HF receiver, MF/HF receiver,  5 kw HF transmitter, 10 kw HF transmitter, 1 kw HF transmitter, 500 kw HF transmitter, 5 kw HF transceiver, 10 kw HF transceiver, 1 kw HF transceiver, 500 kw HF transceiver), Sunair continues to leverage its history and experience to serve a host of the world’s major air forces, governments, civil aviation agencies, and airlines for their respective strategic air communications requirements. Sunair offers complete ground-to-air communications packages for airborne support, airspace security, and air traffic control applications. Sunair’s entrance into the sphere of high power transmission with the development of solid-state 5 and 10-kilowatt amplifiers, and acceptance of the product range by NATO, has generated substantial attention from air forces and aviation agencies searching for a proven long-range communications solution permitting complete hemispheric coverage.

MARITIME

Having more than four decades of experience in delivering equipment (HF radios and MF/HF radios), systems, and services to joint forces, navies, coast guards, and marine corps around the world, Sunair is a demonstrated leader in strategic maritime communications. Sunair provides complete ship-to-shore communications packages (HF radios and MF/HF radios) for military, emergency management, disaster relief, and peacekeeping applications.

Having first begun in 1956 as a manufacturer of airborne HF radios (MF/HF radios, 5 kw MF/HF transmitter, 10 kw MF/HF transmitter, 1 kw MF/HF transmitter, 500 kw MF/HF transmitter, 5 kw MF/HF transceiver, 10 kw MF/HF transceiver, 1 kw MF/HF transceiver, 500 kw MF/HF transceiver, HF receiver, MF/HF receiver,  5 kw HF transmitter, 10 kw HF transmitter, 1 kw HF transmitter, 500 kw HF transmitter, 5 kw HF transceiver, 10 kw HF transceiver, 1 kw HF transceiver, 500 kw HF transceiver).

HF Transmitters & Receivers

We deliver long-range surveillance platforms utilising the latest MF/HF transmitters (500 W, 1 kW, 5 kW, 10kW), which have been designed to meet the harsh and challenging environments associated with the defence and civil sectors.

Explore the latest in HF transmitters and HF receivers designed for demanding environments in both defense and civil sectors.

Having first begun in 1956 as a manufacturer of  HF radios (MF/HF radios, 5 kw MF/HF transmitter, 10 kw MF/HF transmitter, 1 kw MF/HF transmitter, 500 w MF/HF transmitter, 5 kw MF/HF transceiver, 10 kw MF/HF transceiver, 1 kw MF/HF transceiver, 500 kw MF/HF transceiver, HF receiver, MF/HF receiver,  5 kw HF transmitter, 10 kw HF transmitter, 1 kw HF transmitter, 500 kw HF transmitter, 5 kw HF transceiver, 10 kw HF transceiver, 1 kw HF transceiver, 500 kw HF transceiver).

Sunair has a history of leadership in the arena of secure radio communications for military, government, civil aviation, and commercial applications worldwide.

Our 8000 Series HF Radios, Linear Power Amplifiers, High Power Transmitters: T-10000 HP 10kW HF Transmitter Wideband, 8220WB 1 kW HF Transmitter Wideband,  RCU-8310 Remote Control Unit,  R-8400 HF Receiver Wideband,  F-9810B Pre-Selector/Post-Selector,  Sunair ARGUS 9000E MCC software fot remotely and simultaneously monitor, configure, and control up to eighteen (18) Sunair 8000 Series radios, Antenna Switching Matrix and Antenna Couplers are the next generation of products supporting mission-critical operations, and are designed for all strategic environments, including C3 (command, control, and communications), fixed station, shelterized, transportable, vehicular, and shipboard. When coupled with our complementary accessories, our equipment covers all contemporary requirements – from basic voice communications to data, email, fax, chat, high speed ALE, encryption, security, and interoperability.