phono for rf

[Cross, Alan (HOU)]

Thank you !

Having experience working with moving high speed, complex data just above
the noise level on extremely long transmission lines --- having any
"impedence bump" in the line was a real nightmare ---- used to wrangle with
engineering staff when all the care we took was undone because of using the
wrong connector at the termination end.........  besides - the RCA jacks are
cool - no other hams use them :-)

alan, wa5uzb


-----Original Message-----
From: Multi-Volti Devices [mailto:multi-volti at SOFTHOUSE.COM]
Sent: Monday, April 26, 1999 11:39 PM
To: HEATH at LISTSERV.TEMPE.GOV
Subject: phono for rf


This topic has probably been discussed before, but I was told by the late
RCA engineer who got me interested in engineering that the RCA/phono jack is
a constant impedance 50 ohm connector (or perhaps close to 50, don't
remember his exact words, and at least for hf), and that is why Collins used
it on hf gear and type N connectors for higher freqs. Can't remember if he
called it a balanced connector, but he did call UHF connectors unbalanced.
Not sure if that's because one conductor is grounded, because N and BNC
would be unbalanced by same logic...guess that's why you use open wire
feeders and feedthrus...

Murray

UHF (PL-259, SO-239), are unbalanced and

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