Doesn't the added inductance of a choke that covers 80, or 40 also add
more than just the length of the coax?
73, Roger (K8RI)
On 3/9/2017 4:57 PM, Jim Brown wrote:
On Thu,3/9/2017 1:47 PM, Dave Clemons wrote:
I am suspicious that doing so would cause the coax lines on the
parasitic elements to no longer be the proper length for 153.45 degrees,
Yes
acting sort of like a loading coil.
No, but screwing up the phasing. Putting it simply, the total length
of coax in each feed must be that 153.45 degree length, including any
coax that you coil up.
Am I correct to assume this would be a bad idea?
Yes, for that reason and also because a coil of coax is NOT an
effective "current balun." What's often called a "current balun" is
really a common mode choke. Study k9yc.com/RFI-Ham.pdf to understand
why that coil of coax is a lousy common mode choke, and to see several
options for GOOD common mode chokes in the Choke Cookbook.
73, Jim K9YC
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73
Roger (K8RI)
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