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PL-259 to RG-8X

Looking for proper procedure to solder PL-259 connector to RG-8X coax

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Here are several ways to install Amphenol's UHF connectors.
Amphenol is the king in connectors. A lot of the stuff on the market is junk
Amphenol wrote the book on connectors. ASK ANY HAM.

Posted on Mar 16, 2009

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Here is the instrucktino in PDF format:

Here is a website with instructions and illustrations:

These will help you out tremendously.

Dean Pitts
Rollin CBs
Mt. Vernon, TX

Posted on May 22, 2008

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Check sensitivity, aerial and aerial connection. Decrease squelch level from 5 to 3

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SWR displays briefly then back 1.1

Your problem is not very well described, but let me guess: while you transmit, SWR peaks shortly to a high value and then drops back sharply.
There are two possible reasons:
1) Strong radio transmission pulse somewhere very close to the antenna;
2) Bad contact between connector and coaxial cable somewhere between SWR meter and antenna. Points to check:
- Coaxial connector on the cable from SWR. Is it soldered properly?
- The coaxial cable: can you see mechanical damage, stress? If you find scratches, broken isolation, sharp bends, etc, try to replace the cable.
- Connection between coaxial cable and antenna (or connector): is it soldered properly, is it not corroded or mechanically damaged?
- Connections inside the antenna (if there are any such joints): look for corrosion and mechanical damage, also loose screws.

If you find multiple places of potential problem, go step by step from antenna towards the SWR meter: if the most distant problematic location is fixed and it still shows this strange behavior, go closer.

Rarely this could be a problem in the SWR meter itself. That can be identified if you replace antenna by a dummy load. Dummy load should never cause bad SWR "flashes" (unless it is mechanically broken, too).

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Carlos, I have a similar problem, & find out, if I move the coax, the reception comes in better. I would check out the coax itself &/or the connector.

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We have two motorola CDM1250 two-way radio installed in the same room .Seem to be getting feedback in one unit when the other unit mic is pressed. it does not happen when the other unit mic is pressed....

You might check your antenna locations, connections, coax and cables. Feedback is sometimes cause by two or more transmitters being too close together (or bad coax/connectors). In the case of mobile radios, this would depend on the location of the external antennas. One radio may be more sensitive than the other, or a PL (private line) code is blocking the interference on the radio which appears to not have a problem. Feedback is caused by RF (radio frequency waves) in the environment. We suggest looking for the leak, and/or repositioning the antennas to be futher apart.

Best regards.

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I want to use an external antenna. Is the antenna

There is a kit available which contains the antenna, mag mount, coax, and connector. OR if you already have your antenna, mag mount and coax, the connector alone is available. You should be able to get these from your local Motorola dealer.

best regards.

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Antennas Uniden Bearcat BC148XLT

Height and placement of the antenna determines range. Also, check to see you have the antenna perpendicular to the ground (straight up), and place the antenna where it has 19" clear around it. (not up against a wall or other obstruction)

Placing the existing antenna higher, or replacing it with an external antenna would give you more range. A simple test before purchasing a new connector, coax and antenna for the scanner, would be to place the scanner where you think you would place an antenna and see if it gives you the range you desire.

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Attachment of PL-259 to RG-8X


The basic procedure has not changed. An illustrated "how to" guide is available here.

Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.

Good luck and kind regards.

Thank you for using FixYa.

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MCM electronics may have an adaptor..Google their name to get the website

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