- 3740 kHz - Blue curve
- 7191 kHz - Red curve
- 14200 kHz - Green curve
Click on the image above for a magnified view.
All plots were done with my 80 m horizontal loop antenna connected to the output of the tuner. For each frequency I performed the following steps:
- Tuned the tuner for minimum SWR with the transceiver as a source at the selected frequency
- Connected the analyzer in place of the transceiver
- Ran a scan from the analyzer software
Using the analyzer mode that enables 3 separate scans to be displayed on a single graph, I saved the composite graph and added frequency labels next to the color legend at the bottom of the graph.
You can see that a good dip in SWR is obtained for first two frequencies. At 14200 kHz, however, the short (84-ft) feed line length did not allow the lowest SWR to be obtained within the 20 m band.