Re: BNC connectors

[Neil Fuller <neil.fuller@xxxxxxxxx>]

Brian

You almost certainly need 75 ohm connectors.

Essentially, co-ax comes in two impedances (note, this is not the same
as resistance and you can't measure it using a DVM!) 75 ohm cable is
generally used for commercial and domestic TV aerials. It's also used
extensively in the broadcast industry so the connectors tend to be a
little cheaper. 50 ohm cable is often used by radio amateurs and
transmitting stations

When making off BNCs (or any connector for that matter) it is critical
that you follow the instructions, paying particular attention to cutting
the cable, insulation, sheath etc to the correct length. This is to
ensure that the impedance of the connector matches to the impedance of
the cable correctly.

IME, crimped connectors are far superior to any other type. I have a
crimp too here, which you are more than welcome to borrow (it hasn't
been used since I left the broadcast TV industry over 8 years ago and I
don't see any of that sort of work on the horizon!). Just send me a mail
offlist and I'll pop it in the post.

HTH

Regards

Neil

Brian G. Reynolds wrote:
>
> Hi all, aint got a clue if this will get through as very few postings
> get through to me......
>
> I have a GV650 and as you will know it has the cables hanging out the
> back ending in BNC connectors.
>
> What I want to do is re-locate these to a panel on the front of my
rack
> but not sure which is the best way to go about it.
>
> I could make extension cables to panel mount joiners or I could go for
> solder jointed panel mounted connectors.
>
> What I am worried about is the more connectors the more possibility of
> degraded transmission quality.
>
> I have found things like 112-1748 on the RS website, http://.rswww.com
> <http://.rswww.com>
> <http://.rswww.com/ <http://.rswww.com/>> but the prices
vary a lot so
> not sure what to
> order.
>
> I am told I need a 75ohm jobbie but this is about all I know.
>
> Any advice please?
>
> Also can anyone advise me of what crimping tool to buy, I have been
> using screw on items.
>
> Thanks all,
>
> Brian.
>
> [Non-text portions of this message have been removed]
>
>



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