20 Apr
2013
20 Apr
'13
6:25 p.m.
On 04/20/2013 01:24 PM, Chuck Guzis wrote:
A little impedance bump like that will have a minimal effect at those
low-ish frequencies.
-Dave
--
Dave McGuire, AK4HZ
New Kensington, PA
However, lots
of cheap BNCs from noname companies do not always follow
this rule.
For most of our purposes, using a 50 or 75 Ohm connector really does
not matter. Look at all the rules that were broken when 10base2 was
popular, especially when people added very short little BNC jumpers,
when the Tee was just a little too tight against the back of the
machine. Somehow the stuff still worked fine.
That's true. Back in my days of 10Base2, I found a great deal on 75 ohm BNC
connectors (the quick-connect, with a threaded hole to secure the coax cable
and braid. RG-58 is a bit too small in its OD for the 75 ohm BNC
connectors. I took some thinwall brass tubing that I had on hand to make up
the difference in cable size, soldered the braid to it and threaded the
result into the connector.
It worked just fine with no apparent shortcomings. I think I still have a
length of the cable with said connectors somewhere...