T E S T E H W L 6 3 4 0 0 ' " • . .■ " ' • ' '

Frequency0.15 - 0^23 Mo/b0.23 - 0,36 M0/.80»S6 - O06 Ws0.6 - 1,0 Mc/s1.0 - 1.6 Mc/s -1.6 - 2.7 toc/.s2.7 - 4.6 Mc/s4.6 - 9.0 Mc/s9 . 0 - 1 6 M c / . s

16 - 28 Mc/b

Wavelength2000 - 1305 Metres1305 — 833 Metres .833' - 500' Metres500 - '3- »0 Metres300 - 187 Metres387'- 111 Metres..Ill - 6bs3 Metres

65,3 - 33.3 Metres33.3 - 18.7 Metres18.7 - 10.7 Metres

The circuit of the tester consists of a tuned reacting detector. ^l°wed

S««2+S?+hpfri«»+«r precision A 0-1 mA meter with luminous scci-e and a

check-;d with the set..e loading of the

in -cue monitor-cbivelvtion is equivuienx, xo normnx loading with the setin use. ThS L?f .batter ies'Vshoi Id be obUd when the oltase £*J; b^g*1?3 Volts and the H.T. battery shouId be clanged when the voltage ^lls be lowoa „o.i+o Thfi i-iffl of the batteries on continuous loud is 01 the oraer 01 ±*touS f5t UT? 2nd sMO hSSra fS? "!. Ii.termitte.it use ahould give considerableimprovement to. the L.T. buttery life.

Es^oTS: JESS SSSdS^eSiSSi ^i^fir^19byDiagrams W.L. 53,396, 53,399 amd &3,400 show the layout, wiring *nd citcuitof the tester.

Operat ion/

«■■•■* "O

Operationrviflr-ic the L T und H.T. Voltages. Select the coil lid covering the

required freSSenoy uSd clip it ohtf the set. Mug in the headphone and switchSn? Make sure thl set is Sot oscillating and check that the W^f-^gg^thf«\la within the reauired limits. . Tuning in the desired signal is best aone uwthe set oscillating. Keeping the reaction control adjusted so that the meterdSflectiSn is a&imate^y §,6 - 0.8 mA. searJ^through the tuni^i ran|gsusine- the "Tune" and "Trimmer'1 controls until ths heterodyne note is noaru.xv

meter*

this sti l l S notyenou^ tie only alternative remaining is to work with minimainstead of maxima

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WL 53,-400.

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TESTER WL. 53ftOO.PHAC. WIRING.

WL. 53,399.