SHARPER TUNING
Undoubtedly there are many constructors, who, after completing a receiver consisting of a sta'go •of tuned radio frequency amplification, a detector and audio amplifier, have noted thatMhe dial of the condenser tuning the secondary coil of the antenna circuit usually logged twenty or so degrees different than the condenser dial used to tune 'the r.f. transformer secondary. This condition may ba caused by a number of things, but usually it is because the antenna coil is too closely coupled to the scondary. This close coupling not only shifts the tuning point, but* broadens the tuning because the resistance of the secondary is increased, due to the absorbing effects of the closely coupled primary circuit. The remedy, of course, it to loosen the coupling betjveen primary and secondary. v Where maximum selectivity is required a ,000 —mfd fixed condenser may be inserted in the antenna lead.
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Bibliographic details
Manawatu Times, Volume LII, Issue 3542, 25 February 1927, Page 4
Word Count
147SHARPER TUNING Manawatu Times, Volume LII, Issue 3542, 25 February 1927, Page 4
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