Subject: Re: How to check for a 50 or 75 ohm connector
Summary: What do you think of these ping times eh?
Reply-To: You can't see me, and I pass right through planets...
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Date: Sun, 22 Dec 2002 18:19:53 GMT
NNTP-Posting-Date: Sun, 22 Dec 2002 13:19:53 EST
On Sun, 22 Dec 2002 16:58:09 +0100, Rene Tschaggelar
>> On Sun, 22 Dec 2002 02:15:12 GMT, Chris Carlen
>> Gave us:
>>>George Shaw wrote:
>> The connector does not possess the impedance. That reference is
>> really about the transmission cable that gets used. Connectors can
>> differ between them, but the cable is what really determines the
>You're a DC worker, I assume.
>It is true that you won't notice the difference between a 50 and 75
>Ohms connector at a few MHz, but there you also could use those 4mm
>Banana plugs. BNC is specified for up too 4GHz @ 50 Ohms and
>1GHz @ 75 Ohms. And N is specified for 18GHz @ 50 Ohms and
>1.5GHz @ 75 Ohms.
>Longer antenna cables are preferably made with 75 Ohms as the voltage
>is higher and the losses therefore lower for a given signal power,
>especially at the upper end.
Yes, but it is the cable that determines it. Of course, the
connector must differ on the CABLE side, by the PLUG to JACK side must
match the spec for BNC.
One can also order SMB, SMA, etc. and the impedance is determined by
the CABLE side on them as well.