Wes Stewart wrote:

A standard in the VHF and up world; it is used in the T-match.

Question - has anyone ever done any analysis or testing of what happens
to a T-match when run off the center frequency of the balun?


Your question is not clear. Are you asking about tee-match performance
or balun performance?

There has been an examination of the balun performance.

"The Half-Wave Balun: theory and application", J Nagle, K4KJ, ham
radio magazine, Sept 1980 pp 32-35



Sorry, I thought it was clear. The T-match, which has the balun as a
part. The balun was mentioned as the reference point for the center
frequency.

tom
K0TAR