I recently purchased a Rigexpert AA-600 and wanted to measure balanced lines, antennas, etc. The MiniBalun and the BL2 were great candidates to create an attachment that would allow a quicker method to cal out the balun while attached to the AA-600.
I used a DPDT center off switch to do just that.
The cal fixture can be used to measure just about anything balanced, including the short in my house telephone wiring with the TDR function of the analyzer! I found a short about 8 feet away from one of the phone jacks. I'll repair that later.
This is a photo showing measurement configuration to measure my 20m QRP trap. Results are within 1% of calculated!
The tan column is calculated values and the E/F columns are without calibration or fixture, just a BNC binding post to an N/M to BNC F/M adapter. The G/H columns are the measurements with the cal fixture. I measured the resonant point by a different method I will talk about later. The Z=Q*Xl method is the calculated value hanging out in the I column.