On Wed, 12 Mar 2008 08:36:12 -0000, "Jeff" wrote:

So please don't denigrate other people's comment without asking about the
facts.

Hi Jeff,

Well, in fact, facts were preciously few and generalities were
liberally asserted. I read facts attesting to "significant loss" and
indicated that it should be attended by heat where in my experience
(and as the head of an RF metrology lab) these connector issues far
more commonly exhibit mismatch loss (and I chose my words with care)
not "significant loss." Bird Wattmeter connectors suffer from this
very problem and I have outlined that in the past.

Bob asked about receive properties and RG6 where BNC or N applications
would be typically found for operation above 150 MHz. My response
with respect to cables (plural) of a short length and terminated with
on-par connectors (plural) indicate that loss (insertion loss both as
dissipative and mismatch) is principally invested in the cable, not
the connector. RCA or F or PL types are not taken seriously in the
real world - but they would work suitably for receive. My personal
limitation to 2 or 3 meter lengths were for jumpers application. My
personal limitation to 1GHz for BNC was for leakage issues, not loss.
BNCs/TNCs are rated to 4GHz and N higher to 12GHz. Bob can then
research cable which has far more specification available on the web.
Abstracting a one-off problem with a barrel connector into general
cautions about issues of dielectric quality brings to mind that one
data point does not denote a trend. An SMA/RG6 combination is not one
that springs automatically to mind; neither does an SMA/50 foot line
(presumably RG174 - even though I would do it in spite of demurring it
as a solution).

For 50 feet, and considering the receiver and the service, and the
link budget, none of this probably matters (not even 2dB). If this is
for EME, then yes, it matters a lot. Bob didn't indicate EME.

73's
Richard Clark, KB7QHC