Ways to terminate the cable in high-frequency connectors. Reference data

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Ways to terminate the cable in high-frequency connectors. Reference data

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Encyclopedia of radio electronics and electrical engineering / Reference materials

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Radio amateurs often have a situation where they need to mount a high-frequency connector on a coaxial cable. It's good if the connector is of a common type, but sometimes "tricky" connectors come across, and it is not known how to plug the cable into them. This article discusses how to terminate the cable in some connectors.

In high-frequency technology, a lot depends on the quality of mounting connectors. With improper termination, inhomogeneities of the wave impedance of the line often occur, which leads to a deterioration in one of its main indicators - SWR. Because of this, the loss of transmitted power increases, and reflected waves appear in the path, which then have to be suppressed. The higher the frequency of the signal, the more important it is to ensure a high quality termination of the connector. The article for each connector provides a short list of basic operations with the necessary comments.

BNC-C25

The details of this connector are shown in fig. 1, and the order of termination - in Fig. 2.

Ways to terminate the cable in high-frequency connectors

1. Put the nut, washer and gasket on the end of the cable. The gasket must be positioned so that the "V" slits point towards the end of the cable being cut. Cut off the outer protective plastic sheath of the cable to a length a (Table 1), depending on the brand of the cable and on which part of the connector you are mounting - male or female.

Ways to terminate the cable in high-frequency connectors

2. Unweave the braid. Separate the braid conductors and cut the insulation of the center wire so that it protrudes a distance c. Carefully irrigate the protruding end of the center wire so as not to melt the insulation.

3. Press the braid conductors against the center conductor insulation. Put the retainer on top of the conductors of the braid and move it to the cut of the outer sheath.

4. Separate the braid conductors, shorten them to a length of approximately 3,2 mm and bend them from above to the retainer.

The conductors must not extend beyond the edge of the retainer. Solder the connector contact to the central conductor, having previously put a sleeve on it.

5. Put on the connector housing and screw the nut into it. The screwing force must be sufficient to ensure that the connector is securely fixed to the cable.

N C8

This connector is shown in fig. 3 and 4.

Ways to terminate the cable in high-frequency connectors

1. Put the nut, washer and gasket on the cable. Cut off the outer shell at a distance a (Table 2).

Ways to terminate the cable in high-frequency connectors

2. Unweave the braid, bend the conductors and cut the insulation of the center conductor to size c.

3. Crimp the cable sheath towards the center conductor. Put the retainer on the conductors of the braid and move it to the cut of the sheath.

4. Shorten the braid conductors and bend them from above to the retainer. Tear off the center conductor and solder the contact.

5. Put on the connector housing and tighten with the nut.

Mini-UHFC39

This connector is shown in fig. 5 and 6.

Ways to terminate the cable in high-frequency connectors

1. Cut the outer sheath, braid and insulation of the central conductor according to the dimensions indicated in table. 3.

Ways to terminate the cable in high-frequency connectors

2. Put the bushing and, if the mounted part of the connector is male, the cap nut (knurled) onto the cable. Do not unwind the braid. Place the contact on the center wire of the cable and slide it as far as it will go. Crimp the contact on the wire with a special tool.

3. Install the connector body so that its mounting part goes under the braid, and the insulation of the central wire of the cable rests against the connector insulator.

4. Firmly hold the connector body and cable and slide the sleeve over the braid.

UHFC1

The installation of this connector is shown in fig. 7.

Ways to terminate the cable in high-frequency connectors

1. Slide the union nut onto the end of the cable. Cut the outer sheath, braid and insulation of the center wire to the specified dimensions. Tin the center conductor and braid, being careful not to melt the center conductor insulation.

2. Push the connector housing onto the cable until it stops. Solder the body to the braid through the solder hole. Solder the center conductor. Avoid overheating.

3. Screw the union nut onto the connector body.

increase

SMA C51

The details of this connector and the installation procedure are shown in fig. 8 and 9.

Ways to terminate the cable in high-frequency connectors

1. Cut the outer sheath of the cable (if any) and the braid to the specified dimensions. Slide the locknut and adjusting nut onto the cable.

2. Put the sleeve on the insulation of the central wire and press it firmly against the braid to ensure good contact between them. Solder the braid to the sleeve. Be careful not to get solder on the threads. Carefully, without damaging the center wire, cut its insulation flush with the front edge of the bushing.

3. Solder the contact to the center conductor in such a way as to provide the specified gap between the contact and the edge of the sleeve. Do not allow solder to get on the outer surface of the contact.

4. Slide the adjusting nut onto the sleeve. Install the split C-ring into the slot on the bushing. Screw in the locknut (loosely, without tightening). Screw the connector to the assembled assembly. The final assembly of the connector is carried out after

phase adjustment. One turn of the adjusting nut corresponds to a phase angle (in degrees) equal to 0,636f, where f is the frequency (in gigahertz). After setting the desired phase value, tighten the connector locknut tightly while holding the adjusting nut. Then tighten the rear locknut.

SMA C43

See fig. 10 and 11.

Ways to terminate the cable in high-frequency connectors

1. Put the nut and gasket on the cable. Cut the outer sheath, braid and insulation of the center wire to the specified dimensions. Unweave the braid and press its conductors to the center wire.

2. Put the retainer on top of the sheath and press it against the outer sheath of the cable. Bend the braid conductors onto the retainer and cut them so that the ends do not touch the protrusion on the retainer.

3. Put the contact on the central wire close to the insulation. Solder the contact. When soldering, avoid overheating and melting of the insulator.

4. Put on the housing and screw in the nut.

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