792-6140-001 | Fieldtech Avionics & Instruments, Inc

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792-6140-001

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Model Number: 490S1
Description: ANTENNA COUPLER

Manufacturer: COLLINS

Alternate Part Number:

National Stock Number:

Categories: Coupler, Antennas

Repair Capabilities: YES

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Stock: 0

SALE CONDITION	PRICE	ACTION
Overhauled Outright	Call For Price	Add To RFQ
Overhauled Exchange	Call For Price	Add To RFQ
Serviceable	Call For Price	Add To RFQ

Product Details

The 490S-1 HF Antenna Coupler provides the proper impedance match between an aircraft shunt or notch antenna and the 50-ohm impedance of the transmission line. The 490S-1 operates for both transmit and receive with a voltage standing wave ratio of not more than 1.3:1 throughout the specified frequency range. The 490S-1 dual system is capable of operating using a common antenna with two transceivers. Three decisions are made by the 490S-1 logic that determine if both couplers are in a receive mode, if one coupler is in a transmit mode, and which coupler received a key (ground) first. The 490S-1 is a lightweight pressurized unit with a removable cover containing a seal gasket. The 490S-1 consist of an electrical equipment case, radio frequency tuner module, loading-phasing discriminator module, control logic card, interface logic card, servo-amplifier card, and power supply/isolation amplifier card. The 490S-1 must be mounted on a 790S mount for proper interface with the aircraft. The 490S-1 is held in the mount by two quick-disconnect captive front clamp. The 490S-1 is tunable over a frequency range from 25 to 30 MHz, and contains the necessary switching and interlocking circuits for use in either a single or dual system ARINC configuration. When a dual system is used, interlock circuits prevent one system from being keyed or turned while the other system is either keyed or tuned. A failure in one system will not preclude the operations of the second system. The 490S-1 uses the 115-V 400-Hz aircraft power and has no special cooling requirements and there are no controls on the 490S-1.