Selectivity for Short-Wave
A GOOD plan if one has trouble in separating stations, is to connect across the ordinary tuning condenser another -very small variable (such as a square-law type with all the plates removed except one fixed and one moving), and to equip it with a slow-motion dial. This gives a facility of searching and accurate tuning that is well worth while. It is most useful for covering the relatively narrow band of amateur wave-lengths; and it certainly is a big advantage to have the band from, say, 20.5 metres (14,630 k.c.) to 22.5 metres (13,330 k.c.) spread over 180 degrees of seale,
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https://paperspast.natlib.govt.nz/periodicals/RADREC19291011.2.76
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Radio Record, Volume III, Issue 13, 11 October 1929, Page 31
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104Selectivity for Short-Wave Radio Record, Volume III, Issue 13, 11 October 1929, Page 31
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