[time-nuts] TNC connectors
GandalfG8 at aol.com
GandalfG8 at aol.com
Tue Jun 23 10:11:36 UTC 2009
In a message dated 23/06/2009 11:00:13 GMT Daylight Time, dave at uk-ar.co.uk
writes:
However, it's years since I saw a 75r version, so I don't know for sure.
Doing that with BNC's will lead to a flaky connection, as the centre pin
on the 75r ones is much smaller. The other way round (50r plug into 75r
socket) will damage the socket. As TNC's are very similar to BNC's ???
----------------
This belief about BNC connectors seems to be an "urban myth", although
admittedly one that I shared for many years.
Whether or not it has been true at some time in the past, or of some
manufacturers, I don't know but the following is a current quote from
Amphenol........
---------------
Two distinct types of 75 Ω BNCs are available, and both mate with each
other and with 50 Ω BNCs. Type 1 is designated 75 Ω BNC-T1 and provides
constant 75 Ω performance with low VSWR DC – 4 GHz. Type 2 is designated 75 Ω
BNC-T2 and is usable with low reflection DC - 1 GHz. For applications above
1 GHz, Type 1 is recommended.
--------------------
The full text of this can be found at....
_http://www.amphenolconnex.com/products/bnc.asp_
(http://www.amphenolconnex.com/products/bnc.asp)
and I've seen similar comments from other manufacturers.
regards
Nigel
GM8PZR
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