Regarding Selectivity
W. BOON (Oamaru) writes re« > garding selectivity:-I use a short wave set with turned s.g. R.F. stage. I wound coils for broadcast and have had good results though set was not selective. Uncontrollable volume troubled me. I have only one reo., and that on det. filament. Here in Oamaru, Wellington and Christchurch were too powerful altogether, so I looked out a midget condenser, .00005 mfd., and put this, externally, in series with aerial lead. On the broadcast band selectivity was fairly good but volume is slightly decreased, : , also, is interference... I can now separate 8YA and 2GB and can very nearly cut. out 2BI, right off the-Jap, alongside (JOFK), a great improve ment on what I had previously with 2YA smothering 2FC, _ On S.W. it works well, with practically no noticeable decrease in ume and cuts out the greater p of interference on 80-metre
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https://paperspast.natlib.govt.nz/periodicals/RADREC19290607.2.41
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Radio Record, Volume II, Issue 47, 7 June 1929, Page 10
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146Regarding Selectivity Radio Record, Volume II, Issue 47, 7 June 1929, Page 10
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