I would echo Frank's comments. I learned long ago that you never measure
antenna gain with any BNC connectors in the signal path. Each joint
would introduce intermittent loss depending on how much the cable
moved. They are not very stable at VHF frequencies. They sure are
convenient though for more simple tasks.
Dave K1WHS
On 4/4/2017 9:19 PM, [email protected] wrote:
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" <[email protected]>
To: [email protected], "Elecraft Reflector" <[email protected]>
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:[email protected]] On Behalf Of
[email protected]
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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