UHF Coax plug testing

Hi,
Just a quickie.
What's the best way to test a newly fitted coax plug with a multimeter. Is it the continuity between tip that has been soldered and the outside case that screws on?
Cheers
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Reply By: Ross M - Monday, Jan 06, 2014 at 11:09

Monday, Jan 06, 2014 at 11:09
The middle pin soldered to the core wire must not touch the fitting or braid. The fitting and braid must touch each other though. The braid is also part of the clamping at the aerial base which connects to earth/neg.

The core wire of the plug should be/has to be connected to the aerial screw for the aerial to receive the transmitted rf energy.

All these can be checked with the ohms set on low ohms.
AnswerID: 523968

Reply By: Hootsmon - Monday, Jan 06, 2014 at 11:13

Monday, Jan 06, 2014 at 11:13
I'm new to multimeters. so if I set it to beep which bits do I touch and what should I hear? I presume tip to outer casing should be no beep?
AnswerID: 523969

Follow Up By: Member - Frank P (NSW) - Monday, Jan 06, 2014 at 11:52

Monday, Jan 06, 2014 at 11:52
Correct, Hootsmon.

Tip to outer casing, no beep.

Tip to tip at the other end, beep.

Casing to casing at the other end, beep.

Cheers
FrankP

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Reply By: Dennis Ellery - Monday, Jan 06, 2014 at 16:52

Monday, Jan 06, 2014 at 16:52
I only use the screw on ones in an emergency.
Find a TV tech and get good quality compression plugs fitted – you will get less loss than using the screw on ones.
Particularly important if you have a low strength signal.
AnswerID: 523985

Reply By: Member - P and JM - Monday, Jan 06, 2014 at 19:16

Monday, Jan 06, 2014 at 19:16
Hootsmon,

Type this into Google for explanations.

How to test coaxial cable with a multimeter ?

Cheers P&J
AnswerID: 523994

Reply By: The Bantam - Wednesday, Jan 08, 2014 at 00:07

Wednesday, Jan 08, 2014 at 00:07
The single most important thing to understand about RF coaxes and terminations IS.

There is no instrument mere mortals can afford that will properly test these circuits.

SO, while it is a good idea to do what basic tests you can.

It is most important to know the the joint is perfect, because you made it that way.

Knowing you business, being carefull and attentive is above all.

Whatever plug or connection system you are using you must prepare carefully and to dimemsions specified and know that the plug has gone on perfectly.

An RF cable can test perfectly fine DC, but can have a number of problems.

I am a technician that has been trained on a number of coax termination systems..and i am pretty damn good with a soldeing iron.
Given the choice, I will use some sort of crimping system on coax....because it is consistent and reliable.

Those screw on connectors, are a bit rough, but with care..AND fitting to the correct cable that can make a satisfactory termination.....but care is certainly required.

cheers

AnswerID: 524070

Reply By: Hootsmon - Wednesday, Jan 08, 2014 at 17:03

Wednesday, Jan 08, 2014 at 17:03
Last one. Is the UHF connector the PL259 typically?
AnswerID: 524099

Reply By: Member - eighty matey - Friday, Jan 10, 2014 at 22:05

Friday, Jan 10, 2014 at 22:05
G'day,

I might be a bit late but I came across this tonight - Coax connectors made easy. I thought it might help.

Steve
AnswerID: 524246

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