Page 9 Advertisement 2

Radio Record, Volume VI, Issue 11, 23 September 1932, Page 9

HNTS fom BOBHORRDBN EARTHING SYSTEMS During the paet tw0 weekg I deelt with thet portion o2 the Antenna Syatem kaown 28 the Aerlal Thig week I wish to call you? attention to the earthing portion of YouI aatennaea Some people &te apparently unaware that the eatthing device 18 a8 vitally important 98 the gertel Itgelf Barthwires from aAY receiver Bhould be kept a8 ehort a8 pogsible and, tbis being the rule; It 19 ofta times advigable to drive a0 Independent earthing pipe, Bay BEta Of 3in: weterpipea However; many ligtenerg often attach thbeir earthwire to 8 plpe connected with theiz weter gupply_ This may certaInly PZO? vide an efclent Farth (frqm 3 Bafety Boiots" view, 80 49 to comply witb regu- but same i8 not alwayo a1 efclent radio earth, beceuse of the fact cbat euch an earthing pipe may run bome congidet- able digtance before actually entering the ground: Tbu8, a8 the earthwire ig @ Dortion 0f the antenna system, the whole iength of antenna would be lengthened and Belectivity Erom your receiver Foud be reduced. Another Doint to be noted 15 this, that waterpipe, even when uBed @8 23 independent driven earth gtake, i9 mot ake wey8 eficient In vlew of the fact tbat the conductivity of the g0il may chazge I2 varioug locations, due to formacion o1 tbe gtrata: In any cage, where goil Wa8 aot gufciently moibt Or of rotten rock or gan& compositlon, I would recommend copper tube Ior earthpipes which are procurable for: the gum of 3/3 post paid. Care ghould be teken to 8ee that the wire jeading %0 eerthing device i8 ~either goldered to 88m0 Or made fagt by 2 brass grouna clampo which gell et 1/- each for 3in. pipea Britieh Variable Condengers, j0005, 300025, 400035 0 0 'o8/- cack 8.088 Rubber covered Darthwire za. Tdo Coil Cane and Valve Cens, aluminium 18 eok 45-volt Leyer-Built Columble B Batteries 87/6 each E3-vo1t Stendara Lined Dry Celle 1/11 each #inest Britigb Indoor Aerials 0 0 B/ = each 5-Wire Battery Cables 8 01/9 eack Tefeg Cone Loudspeakers Were G3/10/ Now 86/= eacb Glezite Wiring Wire d 0 0 0 0 0 82a Gotl Write {0r Catalogue: BOB HOPROBIN "Fladtlight Corner" 2 Courtenay Fera WELLINGTON Quick Repairs Pnone 52-357, 70