Part #: 064-01076-0101

Model: KTR-909B






UHF Transceiver w/ Guard

Part Number :
Davtron Logo



  • Item Controlled by the US DOS or DOC, Export License Required -
    Contact SEA for more information
  • UHF Communications Transceiver providing two-way AM voice communications
  • Specifically designed for international governmental, military, and paramilitary applications
  • Specified for use in US Air Force and US Navy training programs
  • Provides access to frequencies ranging from 225.000-399.975 MHz in 25 kHz increments
  • Used with KFS-599B digital control
  • Stuck-mic protection
  • Solid-state
  • Designed for high reliability
  • Incorporates ARINC 429 bus interface for radio control via FMS
    Note: Control via either KFS-599B or FMS not both; KFS-599B can be installed as backup
    for FMS if needed)
  • Will support dual controls (KFS-599B) in tandem operation (i.e. master/slave configuration)
  • Provides tuning for remote ADF systems
  • Same as KTR-909 but also provides continuous monitoring of guard channel via a dedicated second receiver



Size: 5.00"H x 2.64"W x 10.93"L Weight: 4.8 lbs.
Frequency Range: 225-399.975 MHz Temperature Range: -55C to +55C
Power Output: no less than 8 watts (10 watts nominal) Altitude: to 55,000 feet
RTCA: DO-160C Power Consumption: 27.5VDC at 1.0A max (receive)
27.5VDC at 10.0A max (transmit)
Duty Cycle: 4:1 (4 min receiver- 1 min transmit) Sidetone Output: Adjustable up to 100mW into 500 ohm load
Harmonic Content: Greater than 55db down from carrier level Spurious Outputs: no less than 60db below carrier level
Transmitter Modulation: NLT 85%, NMT 98% Transmitter Microphone: Dynamic mike containing transistorized preamp or standard carbon
Receiver Sensitivity: 3uV for no less than 6dB signal plus noise-to-noise with 1000 Hz tone modulated 30% Receiver Selectivity: -6db (bandwidth) no less than 25 kHz with no less than 12 kHz each side.
Audio Output: No less than 100mw into 500 ohm load Audio Response: No more than 6db variation from 350-2500 Hz
Squelch: Automatic with manual disable squelch override AGC: 5uv to 200mv for audio level change of less than 3db
Part Number: Description:
064-01076-0101 UHF Transceiver w/ Guard


Serial # KTR909B-3137
Condition OH
Mods 1-10,12
Tag Date 09/28/21
Shop Southeast Aerospace Inc.
Warranty 6 Months
- UHF Transceiver w/ Guard

NSN: 5821-01-482-8431

Price Condition Status

Click on a question below to see the answer. If you have a question about this model that is not answered below, please contact

Southeast Aerospace recommends either the RA Miller AT-1108/ARC or Sensor Systems S65-8282-34 antenna for aircraft with both VHF and UHF band radios.

If you are adding a UHF radio such as the Bendix/King KTR-909 to an aircraft already fitted with a VHF radio and wish to keep that VHF radio installed, then the RAMI AT-1108/ARC is recommended to replace the existing VHF antenna. The AT-1108/ARC includes separate coax connections for the VHF and UHF antenna lines.

If you are adding radio that covers both the VHF and UHF bands such as the Cobham (Wulfsberg) RT-5000 Flexcomm, then the Sensor Systems S65-8282-34 is recommended due to its single coax connector design.

AT-1108/ARC AT-1108/ARC Footprint S65-8282-34 S65-8282-34 Footprint
While most TCAS I and TCAS II antennas are manufactured by Sensor Systems for other manufacturers, they all possess different part numbers and models numbers. Some even will indicate a Sensor Systems part number. However, that number indicates proprietary part number and status that Sensor Systems will have with the manufacturers such as Honeywell and L3. You cannot purchase the TCAS antenna with the Sensor Systems part number direct from Sensor Systems.

Regarding interchangeability, there are very similar characteristics between the various TCAS antennas. However, it is not so much the functionality characteristics that determine the interchangeability as it is the certification. That is, since an L3 antenna part number will not be listed in a Honeywell TCAS STC installation manual, you cannot substitute one for the other.

Guard is a term used to describe a special option on tactical radios. This special option is a dual monitoring system that continually monitors emergency channels (either a preset or selected channel, depending on unit options) for broadcasts, while still receiving on the main receiver. The radio will annunciate a notice when there is a broadcast on the emergency channel. Annunciation type depends on the particular unit and set up options.

This feature is particularly useful for search and rescue mission aircraft.

For more information on SEA offered products with a "guard" feature, click here.