Frank,
I have had intermittent problems with BNC and N connectors. It was a
really subtle thing. The connectors were for 75 Ohm connection vice 50
Ohms. That meant the center pin was thinner which caused intermittent
connections. After that, I've always checked to see that I didn't make
that mistake again.
73,
Barry
K3NDM
------ Original Message ------
From: donov...@starpower.net
To: "Elecraft Reflector" <elecraft@mailman.qth.net>
Sent: 4/4/2017 5:19:47 PM
Subject: Re: [Elecraft] K3 loss of rx signal
Hi Ron,
If you've ever used BNC connectors in a lab environment -- especially
above about 30 MHz -- you soon become aware of their shortcomings
especially if they don't fit snugly. I've never noticed BNC problems
at HF frequencies except for worn (or cheaply made) connectors that
fit very loosely.
I'm sure the Amphenol connectors are very high quality and perhaps
not as leaky and unreliable as generic (or worn) connectors
73
Frank
W3LPL
----- Original Message -----
From: "Ron D'Eau Claire" <r...@cobi.biz>
To: donov...@starpower.net, "Elecraft Reflector"
<elecraft@mailman.qth.net>
Sent: Tuesday, April 4, 2017 9:09:32 PM
Subject: RE: [Elecraft] K3 loss of rx signal
Good point Frank.
Amphenol specs leakage for their BNC connectors at 3GHz where they
claim 55
dB. By comparison they claim 90 dB at 3 GHz for their type N
connectors.
I've never felt the need for the additional shielding in the shack.
Of course these are Amphenol specs. Any other brand may have any other
level
of leakage. As many have noted, the extra price of a good connector is
saved
many times over chasing bad cable connections later.
BNC specs
http://www.amphenolrf.com/connectors/bnc.html
N specs:
http://www.amphenolrf.com/connectors/n-type.html
73, Ron AC7AC
-----Original Message-----
From: Elecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of
donov...@starpower.net
Sent: Monday, April 3, 2017 9:38 PM
To: Elecraft Reflector
Subject: Re: [Elecraft] K3 loss of rx signal
BNC connectors rate high for convenience and low for performance,
especially
leakage performance.
BNC connector leakage typicallymeasures in the range from -25 to
-50 dB vs -60 to -90 dB for N connectors. Any BNC connector
that does not fit snugly should replaced and discarded
73
Frank
W3LPL
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