KJ4ZFJ Posted April 13, 2021 Share Posted April 13, 2021 Would there be a need to create an rf choke with coiled coax at the connection to the ladder line? Link to comment Share on other sites More sharing options...
0 Administrators K3MRI Posted April 13, 2021 ELMER Administrators Share Posted April 13, 2021 29 minutes ago, KJ4ZFJ said: Would there be a need to create an rf choke with coiled coax at the connection to the ladder line? Hi Tim. Moved the question to a new thread. Will reply shortly. Link to comment Share on other sites More sharing options...
0 Administrators K3MRI Posted April 13, 2021 ELMER Administrators Share Posted April 13, 2021 So, that's also a really good question and one which other Elmers might answer better, but I'll give it a shot. First of all, a coiled choke has a purpose, to reduce common-mode current that may bring RF into the shack. As such, in all cases, you would rather have the choke nearer to the tuner than to the connection. Secondly, I will point you to an interesting, albeit technical paper on chokes: I will add that you should only use a choke if you experience noise - generally speaking. One reason is a loss of power through heat. When he common mode signal hits the choke and creates a magnetic flux inside, lots of energy is lost (hysteresis and perhaps other effects) as heat. You're reducing energy. Another thing to consider is whether or not there is a likelihood of common mode noise in your environment. Bad full-bridge power inverters can be one source. Grounding issues are another. If I were you, I would avoid the choke initially, you can always wind the coax later. Let's see how many disagree with me? 😎 Link to comment Share on other sites More sharing options...
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KJ4ZFJ
Would there be a need to create an rf choke with coiled coax at the connection to the ladder line?
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