Hi Don and others- Ok.Here is my answer- I don't think I am far off by saying that the unique similarity it is in using switched components to effect frequency coverage of the same tuning coil. In the HRO they had clips you could change over to go to "bandspread" mode on each coil assembly, Elecraft uses relays (switches) to change capacitor values in their bandpass filters so that the same assembly can cover two ranges. Essentially the same thing. I don't think any other companies have used this technique as extensively as National and Elecraft. Your opinion may vary......... Doug Dr.Doug Millar EdD. K6JEY drzarko...@yahoo.com 562 810 3989 cell/text
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