Frequency | Capacitance Required | Ham Band | Efficiency |
21 Mhz | 24 pF | 15M | 89% - 0.5dB below 100% |
18 Mhz | 33 pF | 17M | 83% - 0.8dB below 100% |
14 Mhz | 55 pF | 20M | 66% - 1.8dB below 100% |
In theory it would be possible to operate the loop down at 40M with a large enough capacitance but with greatly reduced efficiency ... perhaps a few S units down (8.3 dB below 100%) ... you could push 50W and still fair ok with PSK31 and Olivia in a pinch.
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