fitting BNC connectors

[johnmuir]

Had to remove connector to enable routing of antenna cable on new gps. Reluctant to buy same BNC connector which requires hex crimpers as will never use again. I therefore bought connecter where you insert cable direct whilst screwing on connector. Apparently this holds on to the brading. The question is should the brading be folded back over outer insulation then screwed into connector or should it be folded over the inner insulator then screwed into place. I know the centre core should protrude past its insulator to connect to central pin. I ve done the later and it seems ok but whats the correct method. Sorry for long winded explaination as electronics is not my trade.
Thanks John

 

[ParaHandy]

Use whichever method gives a neater job. Do make sure both signal and earth screens are making good contact. A dab of solder on the signal core can help keep a reliable connection.

 

[philip_stevens]

As Parahandy says, whichever gives the neater job.

But, I have a fitting instruction leaflet that shows it folded back over the outer insulation covering.

regards,
Philip

 

[Gordonmc]

Did the same job @ the weekend... if the co-ax cable has a woven outer braid, push back from the end and with care you can get it to roll over the outer insulation. This gives a very good contact and an easier fitting.
I agree with previous thread that a solder connection on the inner pin is a good idea.

 

[Buck]

It should be folded back, achieving correct shielding. This allows the thread on the twist on connector to bite into the braid so defeating any corrosion or coating on the braid, I use these connectors a lot and we did a study on them some years ago.

Buck



the past is past, only the future can change.

 

[stuartw]

Screw-in type not good

Whereas the method advised by everybody is correct for the type you bought, your choice of replacement is not. The best BNC is a pressure sleeve clamp type, where there is a separate Nut, washer,sealing gland, braid grounding ring, barrel & centre pin. The nut should be slipped over the outer first, followed by the washer, rubber sealing ring, grounding ring, with the braid folded back over that and trimmed. The braid is essentially jammed between the ground ring and a conical section inside the barrel. The centre pin should always be soldered or crimped. With the nut done up properley, then the 'O' ring is compressed, thus sealing the cable entry at the same time compressing the braid onto the barrel. High quality nickel plated type can be obtained from RS components.
The above type is the only one which is good enough for a marine environment, apart from professionally crimped and sealed versions.
Believe me I've been using them for 35+years
rgds
Stuart

 

[stuartw]

Screw-in type not good

Whereas the method advised by everybody is correct for the type you bought, your choice of replacement is not. The best BNC is a pressure sleeve clamp type, where there is a separate Nut, washer,sealing gland, braid grounding ring, barrel & centre pin. The nut should be slipped over the outer first, followed by the washer, rubber sealing ring, grounding ring, with the braid folded back over that and trimmed. The braid is essentially jammed between the ground ring and a conical section inside the barrel. The centre pin should always be soldered or crimped. With the nut done up properley, then the 'O' ring is compressed, thus sealing the cable entry at the same time compressing the braid onto the barrel. High quality nickel plated type can be obtained from RS components.
The above type is the only one which is good enough for a marine environment, apart from professionally crimped and sealed versions.
Believe me I've been using them for 35+years
rgds
Stuart

 

[johnmuir]

Re: Screw-in type not good

Point taken, will go for the type you suggested from RS components. Its a good job the antenna comes with lot of cable as I 'll need to remove the screw in connector.
Thanks for your advice and everyone who responded.