User's Manual Part 1

Table Of Contents

Page 4-16

3 Mar 2017

23-15-29

SYSTEM DESCRIPTION AND INSTALLATION MANUAL

JetWave™ System

(b) Immediately before installing the KRFU into the aircraft, remove white opaque protective

backing on both pads to expose the non-tacky side of the thermal pad.

NOTE: If the KRFU unit is to be shipped or stored before installation, do NOT remove

the white opaque backing on the thermal pads.

NOTE: Honeywell does not recommend applying the thermal pad to the KRFU if the

KRFU is to be shipped or stored. KRFU thermal pad installation should be done

shortly before actual KRFU installation.

C. KFRU - Waveguide/coax RF Losses

A waveguide is typically used for the KRFU to OAE RF TX connection. The waveguide run should

include a short length of seamless flexible waveguide along the routing to accommodate

tolerances. The waveguide must have mounting points to interface to the attachment points

provided.

NOTE:

A coax cable can be used in the place of the waveguide as long as the maximum insertion

loss allowable for the KRFU to OAE RF TX connection is not exceeded.

The requirements for waveguide installation vary for each aircraft.

NOTE:

Make sure the waveguide is connected before powering the KRFU. Always connect J1 last

and disconnect J1 first (J1 contains the A/C power).

Refer to Figure 4-27, Figure 4-28, and Figure 4-29 for outline and installation information. Refer to

Figure 4-34 thru Figure 4-37 for the applicable interconnect diagram.

The TX path interconnect loss between the KRFU and the TMA must not exceed 0.6 dB.

The RX path interconnect loss between the KRFU and the TMA must be a minimum of 0.5 dB, and

not exceed 2 dB.

The RX path interconnect between the KRFU and the FMA must not exceed 2.9 dB.

NOTE:

RX connection requires a transition from coax to WR42 at the KRFU.

Honeywell recommends that a WR42 to coax adapter is put at the KRFU end of the cable.

D. KRFU - Thermal Conduction Path

The transmit operation of the AES is muted if the conduction-cooled KRFU is installed under the

radome and its temperature exceeds the temperature indicated in the outline and installation

drawings. Refer to Figure 4-27 thru Figure 4-29.

The conduction-cooled KRFU is dependent on heat conduction through its base to a thermally

conductive path in order to minimize the KRFU temperature. Conduction to the aircraft mounting

plate is dependent on proper installation of the KRFU thermal pad. The outline and installation

drawings in Figure 4-30 thru Figure 4-32 provide detailed thermal pad installation instructions.

If the shutdown temperature is exceeded, a low-power mode (non-RF communicating) is entered

until the temperature reduces to approximately 10° below the shutdown temperature. Refer to

Figure 7-3 for the temperature status report.

Draft as of 31 May 2017