OCR Text |
Show Trouble in Adjusting Secondary Condenser While tuning in phone signals and C.W., considerable trouble in adjusting adjust-ing the secondary condenser is often experienced. The following Is a method devised and used with good results re-sults : Take an ordinary 43-pnte condenser out of its casing and mount ft targe gear wlel on Its shaft; the condenser con-denser in turn Is mounted on the back of the receiving panel In the usual manner with the exception that no shaft protrudes. A small gear wheel Is mounted on a brass shaft and fitted through the panel so as to mesh with the large gear. Tills shaft may be centered cen-tered on the cover of the condenser or other arrangements made for Its rear bearing, the panel acting as front bearing. Upon this shaft a S-int1? dial and knob are attached. At the present stage it may be used and an adjustment adjust-ment of 5 to 1 secured. The gears may be obtnlned from a telephone bell ringer, nhich serves the purpose admirably ad-mirably owing to the numerous teeth on the gears. For much finer adjustment, another shaft In vertical line with the condenser con-denser and dial centers may be fitted upon which Is mounted piece of rubber rub-ber packing In such a manner as to bear friction against the under side of the dial. A small binding post knob Is attached to this shaft winch further allows close adjustment, similar to the vernier attachments on the market today. to-day. The dial will turn several times 1 m-mmi before the condenser has made half a revolution and In order to know how your condenser is setting, a ISO-degree scale Is mounted on the large cog wheel and an opening cut In the panel to view the scale. The illustration makes this description descrip-tion clearer and from the general plan the amateur may devise his own means for mounting the gears and condensers he may have on hand. |