[Elecraft] K3 loss of rx signal

[donovanf at starpower.net]

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" <ron at cobi.biz> 
To: donovanf at starpower.net, "Elecraft Reflector" <elecraft at 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-bounces at mailman.qth.net] On Behalf Of 
donovanf at 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