Garmin GTX 320, Maintenance Manual

190-00133-02 Rev B                                                                                                                                                                                     2-2

2.3.3   Antenna Test Cable Connector

The antenna test cable incorporates a BNC connector at the test fixture antenna and a male BNC “blindmate” connec-

tor (GARMIN P/N 330-00198-00) at the transponder. Figure 2-2 shows the connector. Follow accepted industry

practices when installing the BNC connector. Use the following instructions when installing the blindmate BNC.

1. Trim coax outer insulation back ½ inch.
2. Trim braid (not center conductor or insulation) back ¼ inch.
3. Strip insulation back 0.120”.

NOTE

If the outside diameter of the coax braid is smaller than the inside diameter of the

center connector sidewall opening, place the ferrule over the coax braid, flush against

the coax outer insulation before performing the next step.

4. Insert cable (center conductor, dielectric and shield braid) through the sidewall of the connector and solder the

center conductor to the center pin of the connector.

NOTE

When using low-loss cable, it may be necessary to flatten the solid wire center

conductor slightly so it can fit the slot on the RF connector center pin. When solder-

ing, avoid applying excess heat to the connector body, and center conductor insula-

tor.

5. Heat the outside of the connector sleeve and, at the same time, apply solder between the braid and the sleeve.
6. Continue to apply heat until the solder flows evenly.
7. Install 50 ohm match.
8. Insert connector cap and tack solder in two places.

Figure 2-2. Blindmate Antenna Connector