Topband: Mother of all ferrite common-mode coaxial chokes

[donovanf at starpower.net]

Hi Mike,

It was good to meet you for the first time this year in Dayton, I enjoyed our brief conversation in the flea market.

I've had exactly the same experience with off brand BNC cables and connectors.  I long ago placed them in the trash!  When you get used to the normal mating tension in a good quality BNC connector, you will soon recognize bad ones.

73
Frank
W3LPL

---- Original message ----
>Date: Fri, 13 Jul 2012 14:04:11 -0400
>From: "Mike Greenway" <K4PI at BELLSOUTH.NET>  
>Subject: Re: Topband: Mother of all ferrite common-mode coaxial chokes  
>To: <topband at contesting.com>
>
>Just a note about something in this same vein that I ran into recently with 
>leakage in cables with BNC connectors.  I bought some 3 ft jumpers made up 
>with BNC connectors and the connector has no tension when connecting to a 
>BNC jack and once in a while I have to reseat the connector to try and get 
>the connection back.  How I noticed it was on a panadapter you could see 
>images start to ingress  Also on a antenna connection I was getting some 
>hash from a switching supply in the receiver and reseating the BNC would 
>clear thing up.  Amphenol and good quality BNC's have some resistance when 
>rotating the BNC ring and they are tight.  The ones if have take very light 
>torque at all to rotate and hence they are not always making a solid 
>connection.  They have no band marking so my guess is they are out of BY. 
>There is one major manufacturer using these right now but are soon to 
>replace them.  73 Mike K4PI 
>
>_______________________________________________
>UR RST IS ... ... ..9 QSB QSB - hw? BK